* reworked color-palette-system:

1. added several new (JKQTPMathImageBone, JKQTPMathImageCool, JKQTPMathImageCopper, JKQTPMathImageAutumn, JKQTPMathImageSeismic, JKQTPMathImageTerrain, JKQTPMathImageViridis, JKQTPMathImageMagma, JKQTPMathImageInferno, JKQTPMathImagePlasma)
  2. reworked LUT-types (now a QVector, instead of a C-array, suing malloc)
  3. reworked available functions to build LUTs (cleanup, more options, clearer names)
  4. added functions to load palettes from files
  5. Improved documentation
* added example for user-controlled color palettes

doc/dox/examples_and_tutorials.dox

@@ -101,6 +101,9 @@ All test-projects are Qt-projects that use qmake to build. You can load them int
 <tr><td> \image html imageplot_small.png
     <td> \subpage JKQTPlotterImagePlot
     <td> `JKQTPColumnMathImage` <br> image data copied from C-style row-major array into a single column of the internal datastore <br> Describes several options of the image plotting classes (different ways of color coding, what to do with data above/below the limits etc.) 
+<tr><td> \image html imageplot_userpal_program_small.png
+    <td> \subpage JKQTPlotterImagePlotUserPalette
+    <td> `JKQTPColumnMathImage` <br> user-defines palettes <br> palettes from files
 <tr><td> \image html imageplot_modifier_small.png
     <td> \subpage JKQTPlotterImagePlotModifier
     <td> `JKQTPColumnMathImage` <br> image data copied from C-style row-major array into a single column of the internal datastore <br> Image is modified by a second image to display two data dimensions at the same time 
@@ -146,6 +149,9 @@ All test-projects are Qt-projects that use qmake to build. You can load them int
 <tr><td> \image html test_styling_small.png
     <td> \subpage JKQTPlotterStyling
     <td> Modifying different Aspects of the Styling of JKQTPlotter
+<tr><td> \image html imageplot_userpal_small.png
+    <td> \subpage JKQTPlotterImagePlotUserPalette
+    <td> `JKQTPColumnMathImage` <br> user-defines palettes <br> palettes from files
 </table>
 
 

doc/dox/jkqtplotter.dox

@@ -509,6 +509,9 @@ Examples:
 \defgroup jkqtplotter_imagelots_tools Tool Functions & Classes for Image Drawing
 \ingroup jkqtplotter_imagelots
 
+\defgroup jkqtplotter_imagelots_tools_LUTS Tool Functions to Build Lookup-Tables for Palettes
+\ingroup jkqtplotter_imagelots_tools
+
 \defgroup jkqtplotter_imagelots_contour Contour Graphs (based on Image Data)
 \ingroup jkqtplotter_imagelots
 

doc/template_verbatimgraph.txt

@@ -0,0 +1,19 @@
+    \verbatim
+       colval
+         ^
+         |
+    250  -
+         |
+    200  -
+         |
+    150  -
+         |
+    100  -
+         |
+     50  -
+         |
+      0  - 
+         |
+        ---|----|----|----|----|----|----|----|----|----|----|--> position
+          0.0  0.1  0.2  0.3  0.4  0.5  0.6  0.7  0.8  0.9  1.0
+    \endverbatim

examples/CMakeLists.txt

@@ -29,6 +29,7 @@ add_subdirectory(filledgraphs)
 add_subdirectory(functionplot)
 add_subdirectory(geometric)
 add_subdirectory(imageplot)
+add_subdirectory(imageplot_userpal)
 add_subdirectory(imageplot_modifier)
 add_subdirectory(imageplot_nodatastore)
 add_subdirectory(imageplot_opencv)

examples/README.md

@@ -42,6 +42,7 @@ All test-projects are Qt-projects that use qmake to build. You can load them int
 |:-------------:| ------------- | ------------- |
 | [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/rgbimageplot_qt_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/rgbimageplot_qt) | [`QImage` as a Graph](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/rgbimageplot_qt) | `JKQTPImage` <br> `QImage` drawn onto a plot with arbitrary scaling <br> inverted coordinate axes |
 | [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot) | [Basic 1-channel Raw C Image Plot](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot) | `JKQTPColumnMathImage` <br> image data copied from C-style row-major array into a single column of the internal datastore <br> Describes several options of the image plotting classes (different ways of color coding, what to do with data above/below the limits etc.) |
+| [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_userpal_program_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_userpal) | [Image Plots with User-Defined Palettes](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_userpal) | `JKQTPColumnMathImage` <br> user-defines palettes <br> palettes from files |
 | [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_modifier_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_modifier) | [Modifier-Feature of Image Plots](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_modifier) | `JKQTPColumnMathImage` <br> image data copied from C-style row-major array into a single column of the internal datastore <br> Image is modified by a second image to display two data dimensions at the same time |
 | [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_nodatastore_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_nodatastore) | [Basic 1-channel Raw C Image Plot <br> without the internal datastore](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_nodatastore) | `JKQTPMathImage` <br> image data in a C-style row-major array, not using internal datastore |
 | [![](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/rgbimageplot_small.png)](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/rgbimageplot) | [Simple 3-channel Math RGB/CMY Image Plot](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/rgbimageplot) | `JKQTPColumnRGBMathImage` <br> image data in a C-style row-major array, not using internal datastore <br> RGB/CMY color compositing |

examples/imageplot_userpal/CMakeLists.txt

@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.0)
+
+set(EXAMPLE_NAME imageplot_userpal)
+set(EXENAME jkqtptest_${EXAMPLE_NAME})
+
+message( STATUS "..   Building Example ${EXAMPLE_NAME}" )
+
+
+# Set up source files
+set(SOURCES ${EXAMPLE_NAME}.cpp)
+set(HEADERS )
+set(RESOURCES imageplot_userpal.qrc )
+set(UIS  )
+
+add_executable(${EXENAME} WIN32 ${SOURCES} ${HEADERS} ${RESOURCES} ${UIS})
+target_include_directories(${EXENAME} PRIVATE ../../lib)
+if(BUILD_STATIC_LIBS)
+    target_link_libraries(${EXENAME} JKQTPlotterLib)
+elseif(BUILD_SHARED_LIBS)
+    target_link_libraries(${EXENAME} JKQTPlotterSharedLib)
+endif()
+
+
+
+# Installation
+if(LIB_INSTALL)
+    install(TARGETS ${EXENAME} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+endif(LIB_INSTALL)

examples/imageplot_userpal/README.md

@@ -0,0 +1,210 @@
+# Example (JKQTPlotter): Image Plots with Custom Palettes {#JKQTPlotterImagePlotUserPalette}
+
+This project (see `./examples/imageplot_userpal/`) demonstrates how to use user-defined color-palettes for image plots.
+The source code of the main application is (see [`imageplot_userpal.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_userpal/imageplot_userpal.cpp)).
+
+# Build Palettes Programmatically 
+
+JKQTPlotter comes with a large set of predefined color palettes, which are enumerated in `JKQTPMathImageColorPalette`.
+In addition you can build your own palettes as simple lookup-tables of type `JKQTPImageTools::LUTType` (which is a `QVector<QRgb>`) and register them in the system (using `JKQTPImageTools::registerPalette()`). There are several options available for building such a palette:
+1. you can simply define a palette from single colors:
+```.cpp
+    JKQTPImageTools::LUTType pal{
+        QColor("blue").rgb(), 
+        QColor("green").rgb(), 
+        QColor("white").rgb(), 
+        QColor("yellow").rgb(), 
+        QColor("red").rgb(), 
+        QColor("red").rgb()
+    };
+```
+    Such a palette will have exactly as many entries, as you specified:  ![palsimple](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_userpal_palsimple.png)
+2. Alternatively you can build a palette from a set of colors with assocziated positions on the values axis (typically 0..1 as these are in any way later mapped to the actual data range):
+```.cpp
+    QList<QPair<double, QRgb> > palsteps2;
+    palsteps2<<qMakePair<double, QRgb>(0.00, QColor("blue").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.05, QColor("green").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.45, QColor("white").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.55, QColor("yellow").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.95, QColor("red").rgba());
+    palsteps2<<qMakePair<double, QRgb>(1.00, QColor("red").rgba());
+    
+    pal=JKQTPBuildColorPaletteLUT(palsteps2, JKQTPImageTools::LUTSIZE);
+```
+    Such a palette will have `JKQTPImageTools::LUTSIZE (=255)` entries  and the colors are not spaced equally: ![palsteps2](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_userpal_palsteps2.png)
+3. The palettes so far had steps, but you can also give a series of nodes with positions (on the value axis) and RGB-colors there (e.g. `palsteps2` above) but then linearly interpolate between these by calling:
+```.cpp
+    pal=JKQTPBuildColorPaletteLUTLinInterpolate(palsteps2, JKQTPImageTools::LUTSIZE);
+```
+    The resulting LUT is then:   ![imageplot_userpal_2_linear](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_userpal_2_linear.png)
+4. Finally there is a second way of linear interpolation, where linear segments are given for the three color channels separately. To use such a definition, call `JKQTPBuildColorPaletteLUTLinSegments` instead (see documenttaion there).
+
+For each of these options, you finally call `JKQTPImageTools::registerPalette()` to make them known to the system:
+```.cpp
+    int userpalette_id=JKQTPImageTools::registerPalette("userpal_computer_readable_name", pal, QObject::tr("User Palette Human-Readable Name"));
+```
+This function returns an integer, which you can cast to a `JKQTPMathImageColorPalette` to use your new palette:
+```.cpp
+    JKQTPColumnMathImage* graph=new JKQTPColumnMathImage(plot);
+    // ...
+    graph->setPalette(static_cast<JKQTPMathImageColorPalette>(userpalette_id));
+```
+
+# Load Palettes from Files
+
+In addition to building palettes/LUTs programmatically, as shown above, you can simply load palettes from files using:
+```.cpp
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/All_idl_cmaps.xml");
+```
+
+This function may load different file formats (discriminated by the extension):
+1. XML-files (extension `.xml`) may contain one or more color palettes and should be formatted as follows:
+```.xml
+    <ColorMap name="PALETTENAME" space="RGB">
+      <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+      <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+      ...
+    </ColorMap>
+```
+   or with several palettes in one file:
+```.xml
+    <ColorMaps>
+        <ColorMap name="PALETTENAME" space="RGB">
+          <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+          <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+          ...
+        </ColorMap>
+        <ColorMap name="PALETTENAME" space="RGB">
+          <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+          <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+          ...
+        </ColorMap>
+        ...
+    </ColorMaps>
+```
+
+2. CSV-files (extensions `.csv`, `.rgb`, `.pal`) are simply a list of 3 or 4 comma-separated values:
+```
+    red, green, blue
+    red, green, blue
+    ...
+```
+    or:
+```
+    scalar, red, green, blue
+    scalar, red, green, blue
+    ...
+```
+    
+By default the palettes are simply read from the files as raw data. Alternatively you can linearly interpolate between the nodes in the file by calling
+```.cpp
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/All_idl_cmaps.xml", true);
+```
+
+Examples for such palette files can be found here: [/examples/imageplot_userpal/palettes/](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_userpal/palettes/)
+
+# Main Program of the Example (GUI)
+
+The rest of the example program [`imageplot_userpal.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/imageplot_userpal/imageplot_userpal.cpp) just generates a 2D function plot as a color-map and displays it ...
+```.cpp
+    // 1. create a window containing a plotter and a combobox to select the color palette
+    //    ... and get a pointer to the internal datastore (for convenience)
+    QWidget win;
+    QVBoxLayout* lay=new QVBoxLayout();
+    win.setLayout(lay);
+    JKQTPMathImageColorPaletteComboBox* cmbPalette=new JKQTPMathImageColorPaletteComboBox(&win);
+    lay->addWidget(cmbPalette);
+    JKQTPlotter* plot=new JKQTPlotter(&win);
+    lay->addWidget(plot);
+    JKQTPDatastore* ds=plot->getDatastore();
+
+    // 2. now we create data for the charts (taken from https://commons.wikimedia.org/wiki/File:Energiemix_Deutschland.svg)
+    const int NX=100; // image dimension in x-direction [pixels]
+    const int NY=NX; // image dimension in x-direction [pixels]
+    const double dx=0.6e-2; // size of a pixel in x-direction [micrometers]
+    const double dy=0.6e-2; // size of a pixel in x-direction [micrometers]
+
+    // 2.1 Parameters for airy disk plot (see https://en.wikipedia.org/wiki/Airy_disk)
+    double NA=1.1; // numerical aperture of lens
+    double wavelength=488e-3; // wavelength of the light [micrometers]
+
+    // 2.2 calculate image of airy disk in a row-major array and immediately store the values
+    //     in a new image column cAiryDisk
+    size_t cAiryDisk=ds->addCalculatedImageColumn(NX, NY, [&](size_t ix, size_t iy)->double {
+        double x=static_cast<double>(static_cast<int>(ix)-NX/2)*dx;
+        double y=static_cast<double>(static_cast<int>(iy)-NY/2)*dy;
+        const double r=sqrt(x*x+y*y);
+        const double v=2.0*M_PI*NA*r/wavelength;
+        if (ix==NX/2 && iy==NY/2) return 1.0;
+        else return pow(2.0*j1(v)/v, 2);
+    }, "imagedata");
+
+
+
+	
+    // 3. create a graph (JKQTPColumnMathImage) with the column created above as data
+    //    The data is color-coded with the color-palette JKQTPMathImageMATLAB
+    //    the converted range of data is determined automatically because setAutoImageRange(true)
+    JKQTPColumnMathImage* graph=new JKQTPColumnMathImage(plot);
+    graph->setTitle("default MATLAB palette");
+    // set the image column with the data
+    graph->setImageColumn(cAiryDisk);
+    // where does the image start in the plot, given in plot-axis-coordinates (bottom-left corner)
+    graph->setX(0);
+    graph->setY(0);
+    // width and height of the image in plot-axis-coordinates
+    graph->setWidth(1);
+    graph->setHeight(1);
+    // color-map is taken from cmbPalette
+    plot->connect(cmbPalette, &JKQTPMathImageColorPaletteComboBox::currentPaletteChanged,[&](JKQTPMathImageColorPalette p) { graph->setPalette(p); plot->redrawPlot(); });
+    cmbPalette->setCurrentColorPalette(graph->getPalette());
+	
+	
+    // 4. add the graphs to the plot, so it is actually displayed
+    plot->addGraph(graph);
+
+	
+    // 5. fix axis and plot aspect ratio to 1
+    plot->getPlotter()->setMaintainAspectRatio(true);
+    plot->getPlotter()->setMaintainAxisAspectRatio(true);
+
+    // 6. autoscale the plot so the graph is contained
+    plot->zoomToFit();
+    
+    
+    // 8. show plotter and make it a decent size
+    win.show();
+    win.resize(500,550);
+    win.setWindowTitle("JKQTPColumnMathImage, User Palettes");
+```
+...along with a `JKQTPMathImageColorPaletteComboBox` to select a colormap and redraw the plot:
+```.cpp
+    JKQTPMathImageColorPaletteComboBox* cmbPalette=new JKQTPMathImageColorPaletteComboBox(&win);
+    // ... 
+    plot->connect(cmbPalette, &JKQTPMathImageColorPaletteComboBox::currentPaletteChanged,[&](JKQTPMathImageColorPalette p) { graph->setPalette(p); plot->redrawPlot(); });
+    cmbPalette->setCurrentColorPalette(graph->getPalette());
+```
+
+It also adds two `QPushButton`s that allow to save the current or all registered color-palettes to small PNG-Files:
+```.cpp
+    QPushButton* btnSavePal=new QPushButton(QObject::tr("save current palette"), &win);
+    btnSavePal->connect(btnSavePal, &QPushButton::clicked, [&]() {
+        auto img=JKQTPImageTools::GetPaletteImage(cmbPalette->currentColorPalette(), JKQTPImageTools::LUTSIZE, 16);
+        img.save(JKQTPImageTools::JKQTPMathImageColorPalette2String(cmbPalette->currentColorPalette())+".png");
+    });
+    lay->addWidget(btnSavePal);
+    QPushButton* btnSaveAllPal=new QPushButton(QObject::tr("save all palettes"), &win);
+    btnSavePal->connect(btnSaveAllPal, &QPushButton::clicked, [&]() {
+        for (auto pn: JKQTPImageTools::getPredefinedPalettes()) {
+            auto p=JKQTPImageTools::String2JKQTPMathImageColorPalette(pn);
+            auto img=JKQTPImageTools::GetPaletteImage(p, JKQTPImageTools::LUTSIZE, 16);
+            img.save("palette_"+JKQTPImageTools::JKQTPMathImageColorPalette2String(p)+".png");
+        }
+    });
+    lay->addWidget(btnSaveAllPal);
+```
+
+The whole program looks like this:
+
+![imageplot_userpal_program](https://raw.githubusercontent.com/jkriege2/JKQtPlotter/master/screenshots/imageplot_userpal_program.png)
+

examples/imageplot_userpal/imageplot_userpal.cpp

@@ -0,0 +1,173 @@
+/** \example imageplot_userpal.cpp
+ * Shows how to plot colored math images/matrices with JKQTPlotter, using user-defined image palettes
+ *
+ * \ref JKQTPlotterImagePlot
+ */
+
+#include <QApplication>
+#include <cmath>
+#include <QWidget>
+#include <QBoxLayout>
+#include <QPushButton>
+#include "jkqtplotter/jkqtplotter.h"
+#include "jkqtplotter/graphs/jkqtpimage.h"
+#include "jkqtplotter/gui/jkqtpcomboboxes.h"
+#include "jkqtcommon/jkqtpbasicimagetools.h"
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+
+int main(int argc, char* argv[])
+{
+    QApplication app(argc, argv);
+
+    // 0. tell the library where to find additional palettes.
+    //    this needs to be done BEFORE first using JKQTPlotter
+    // 0.1 first we want to build a user-defined palette with five colors
+    //     from a simple list of these colors:
+    JKQTPImageTools::LUTType pal{
+        QColor("blue").rgb(),
+        QColor("green").rgb(),
+        QColor("white").rgb(),
+        QColor("yellow").rgb(),
+        QColor("red").rgb(),
+        QColor("red").rgb()
+    };
+    JKQTPImageTools::registerPalette("userpal_list", pal, QObject::tr("User Palette simple list"));
+
+    // 0.2 first we want to build a user-defined palette with five colors
+    //     the function JKQTPBuildColorPaletteLUT builds a full-sized palette
+    //     with steps from the given 5 colors.
+    //     Note that you need to double the last color in order to define its range's
+    //     beginning and end
+    QList<QPair<double, QRgb> > palsteps1;
+    palsteps1<<qMakePair<double, QRgb>(0.0, QColor("blue").rgba());
+    palsteps1<<qMakePair<double, QRgb>(0.2, QColor("green").rgba());
+    palsteps1<<qMakePair<double, QRgb>(0.4, QColor("white").rgba());
+    palsteps1<<qMakePair<double, QRgb>(0.6, QColor("yellow").rgba());
+    palsteps1<<qMakePair<double, QRgb>(0.8, QColor("red").rgba());
+    palsteps1<<qMakePair<double, QRgb>(1.0, QColor("red").rgba());
+    JKQTPImageTools::registerPalette("userpal_1_steps", JKQTPBuildColorPaletteLUT(palsteps1), QObject::tr("User Palette 1, steps"));
+
+
+    //     With the double value (first argument), you can determine where the next color
+    //     band starts, with respect to the other colors. As an example, we make the central
+    //     white band narrow, as well as the bands at the borders:
+    QList<QPair<double, QRgb> > palsteps2;
+    palsteps2<<qMakePair<double, QRgb>(0.00, QColor("blue").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.05, QColor("green").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.45, QColor("white").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.55, QColor("yellow").rgba());
+    palsteps2<<qMakePair<double, QRgb>(0.95, QColor("red").rgba());
+    palsteps2<<qMakePair<double, QRgb>(1.00, QColor("red").rgba());
+    int userpalette_id=JKQTPImageTools::registerPalette("userpal_2_steps", JKQTPBuildColorPaletteLUT(palsteps2), QObject::tr("User Palette 2, steps"));
+
+
+    // 0.2 If we use JKQTPBuildColorPaletteLUTLinInterpolate() instead of JKQTPBuildColorPaletteLUT(),
+    //     the palettes will be smooth (linearly interpolated between the single given colors:
+    JKQTPImageTools::registerPalette("userpal_1_linear", JKQTPBuildColorPaletteLUTLinInterpolate(palsteps1), QObject::tr("User Palette 1, linear"));
+    JKQTPImageTools::registerPalette("userpal_2_linear", JKQTPBuildColorPaletteLUTLinInterpolate(palsteps2), QObject::tr("User Palette 2, linear"));
+
+    // 0.3 Now we load a whole set of additional palettes from an XML-file:
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/All_idl_cmaps.xml");
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/All_mpl_cmaps.xml");
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/CoolWarmUChar33.csv");
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/CoolWarmUChar257.csv");
+    JKQTPImageTools::registerPalettesFromFile(":/usercolorpalettes/palettes/NSW_Discrete_Z_ColorMap.xml");
+
+
+    // 1. create a window containing a plotter and a combobox to select the color palette
+    //    ... and get a pointer to the internal datastore (for convenience)
+    QWidget win;
+    QVBoxLayout* lay=new QVBoxLayout();
+    win.setLayout(lay);
+    JKQTPMathImageColorPaletteComboBox* cmbPalette=new JKQTPMathImageColorPaletteComboBox(&win);
+    lay->addWidget(cmbPalette);
+    JKQTPlotter* plot=new JKQTPlotter(&win);
+    lay->addWidget(plot);
+    JKQTPDatastore* ds=plot->getDatastore();
+
+    // 2. now we create data for the charts (taken from https://commons.wikimedia.org/wiki/File:Energiemix_Deutschland.svg)
+    const int NX=100; // image dimension in x-direction [pixels]
+    const int NY=NX; // image dimension in x-direction [pixels]
+    const double dx=0.6e-2; // size of a pixel in x-direction [micrometers]
+    const double dy=0.6e-2; // size of a pixel in x-direction [micrometers]
+
+    // 2.1 Parameters for airy disk plot (see https://en.wikipedia.org/wiki/Airy_disk)
+    double NA=1.1; // numerical aperture of lens
+    double wavelength=488e-3; // wavelength of the light [micrometers]
+
+    // 2.2 calculate image of airy disk in a row-major array and immediately store the values
+    //     in a new image column cAiryDisk
+    size_t cAiryDisk=ds->addCalculatedImageColumn(NX, NY, [&](size_t ix, size_t iy)->double {
+        double x=static_cast<double>(static_cast<int>(ix)-NX/2)*dx;
+        double y=static_cast<double>(static_cast<int>(iy)-NY/2)*dy;
+        const double r=sqrt(x*x+y*y);
+        const double v=2.0*M_PI*NA*r/wavelength;
+        if (ix==NX/2 && iy==NY/2) return 1.0;
+        else return pow(2.0*j1(v)/v, 2);
+    }, "imagedata");
+
+
+
+	
+    // 3. create a graph (JKQTPColumnMathImage) with the column created above as data
+    //    The data is color-coded with the color-palette JKQTPMathImageMATLAB
+    //    the converted range of data is determined automatically because setAutoImageRange(true)
+    JKQTPColumnMathImage* graph=new JKQTPColumnMathImage(plot);
+    graph->setTitle("default MATLAB palette");
+    // set the image column with the data
+    graph->setImageColumn(cAiryDisk);
+    // where does the image start in the plot, given in plot-axis-coordinates (bottom-left corner)
+    graph->setX(0);
+    graph->setY(0);
+    // width and height of the image in plot-axis-coordinates
+    graph->setWidth(1);
+    graph->setHeight(1);
+    // color-map is taken from cmbPalette
+    plot->connect(cmbPalette, &JKQTPMathImageColorPaletteComboBox::currentPaletteChanged,[&](JKQTPMathImageColorPalette p) { graph->setPalette(p); plot->redrawPlot(); });
+    graph->setPalette(static_cast<JKQTPMathImageColorPalette>(userpalette_id));
+    cmbPalette->setCurrentColorPalette(graph->getPalette());
+	
+	
+    // 4. add the graphs to the plot, so it is actually displayed
+    plot->addGraph(graph);
+
+	
+    // 5. fix axis and plot aspect ratio to 1
+    plot->getPlotter()->setMaintainAspectRatio(true);
+    plot->getPlotter()->setMaintainAxisAspectRatio(true);
+
+    // 6. autoscale the plot so the graph is contained
+    plot->zoomToFit();
+
+
+    // 7. Finally we add two buttons that save the current palette to a PNG-file and all loaded palettes:
+    QPushButton* btnSavePal=new QPushButton(QObject::tr("save current palette"), &win);
+    btnSavePal->connect(btnSavePal, &QPushButton::clicked, [&]() {
+        auto img=JKQTPImageTools::GetPaletteImage(cmbPalette->currentColorPalette(), JKQTPImageTools::LUTSIZE, 16);
+        img.save(JKQTPImageTools::JKQTPMathImageColorPalette2String(cmbPalette->currentColorPalette())+".png");
+    });
+    lay->addWidget(btnSavePal);
+    QPushButton* btnSaveAllPal=new QPushButton(QObject::tr("save all palettes"), &win);
+    btnSavePal->connect(btnSaveAllPal, &QPushButton::clicked, [&]() {
+        for (auto pn: JKQTPImageTools::getPredefinedPalettes()) {
+            auto p=JKQTPImageTools::String2JKQTPMathImageColorPalette(pn);
+            auto img=JKQTPImageTools::GetPaletteImage(p, JKQTPImageTools::LUTSIZE, 16);
+            img.save("palette_"+JKQTPImageTools::JKQTPMathImageColorPalette2String(p)+".png");
+        }
+    });
+    lay->addWidget(btnSaveAllPal);
+
+
+
+    // 8. show plotter and make it a decent size
+    win.show();
+    win.resize(500,550);
+    win.setWindowTitle("JKQTPColumnMathImage, USer Palettes");
+
+
+    return app.exec();
+}

examples/imageplot_userpal/imageplot_userpal.pro

@@ -0,0 +1,27 @@
+# source code for this simple demo
+SOURCES = imageplot_userpal.cpp 
+
+# configure Qt
+CONFIG += link_prl qt
+QT += core gui xml svg
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
+
+# output executable name
+TARGET = imageplot_userpal
+
+# include JKQTPlotter source code
+DEPENDPATH += ../../lib  ../../qmake/staticlib/jkqtplotterlib
+INCLUDEPATH += ../../lib
+CONFIG (debug, debug|release) {
+    LIBS += -L../../qmake/staticlib/jkqtplotterlib/debug -ljkqtplotterlib_debug
+} else {
+    LIBS += -L../../qmake/staticlib/jkqtplotterlib/release -ljkqtplotterlib
+}
+message("LIBS = $$LIBS")
+
+win32-msvc*: DEFINES += _USE_MATH_DEFINES
+win32-msvc*: DEFINES += NOMINMAX
+
+
+
+

examples/imageplot_userpal/imageplot_userpal.qrc

@@ -0,0 +1,9 @@
+<RCC>
+    <qresource prefix="/usercolorpalettes">
+        <file>palettes/All_idl_cmaps.xml</file>
+        <file>palettes/All_mpl_cmaps.xml</file>
+        <file>palettes/CoolWarmUChar33.csv</file>
+        <file>palettes/CoolWarmUChar257.csv</file>
+        <file>palettes/NSW_Discrete_Z_ColorMap.xml</file>
+    </qresource>
+</RCC>

examples/imageplot_userpal/imageplot_userpal_and_lib.pro

@@ -0,0 +1,8 @@
+TEMPLATE = subdirs
+
+SUBDIRS +=  jkqtplotterlib imageplot
+
+jkqtplotterlib.file = ../../qmake/staticlib/jkqtplotterlib/jkqtplotterlib.pro
+
+imageplot.file=$$PWD/imageplot.pro
+imageplot.depends = jkqtplotterlib

examples/imageplot_userpal/palettes/CoolWarmUChar257.csv

@@ -0,0 +1,258 @@
+Scalar,R,G,B
+0,59,76,192
+0.00390625,60,78,194
+0.0078125,61,80,195
+0.01171875,62,81,197
+0.015625,63,83,198
+0.01953125,64,85,200
+0.0234375,66,87,201
+0.02734375,67,88,203
+0.03125,68,90,204
+0.03515625,69,92,206
+0.0390625,70,93,207
+0.04296875,71,95,209
+0.046875,73,97,210
+0.05078125,74,99,211
+0.0546875,75,100,213
+0.05859375,76,102,214
+0.0625,77,104,215
+0.06640625,79,105,217
+0.0703125,80,107,218
+0.07421875,81,109,219
+0.078125,82,110,221
+0.08203125,84,112,222
+0.0859375,85,114,223
+0.08984375,86,115,224
+0.09375,87,117,225
+0.09765625,89,119,226
+0.1015625,90,120,228
+0.10546875,91,122,229
+0.109375,93,123,230
+0.11328125,94,125,231
+0.1171875,95,127,232
+0.12109375,96,128,233
+0.125,98,130,234
+0.12890625,99,131,235
+0.1328125,100,133,236
+0.13671875,102,135,237
+0.140625,103,136,238
+0.14453125,104,138,239
+0.1484375,106,139,239
+0.15234375,107,141,240
+0.15625,108,142,241
+0.16015625,110,144,242
+0.1640625,111,145,243
+0.16796875,112,147,243
+0.171875,114,148,244
+0.17578125,115,150,245
+0.1796875,116,151,246
+0.18359375,118,153,246
+0.1875,119,154,247
+0.19140625,120,156,247
+0.1953125,122,157,248
+0.19921875,123,158,249
+0.203125,124,160,249
+0.20703125,126,161,250
+0.2109375,127,163,250
+0.21484375,129,164,251
+0.21875,130,165,251
+0.22265625,131,167,252
+0.2265625,133,168,252
+0.23046875,134,169,252
+0.234375,135,171,253
+0.23828125,137,172,253
+0.2421875,138,173,253
+0.24609375,140,174,254
+0.25,141,176,254
+0.25390625,142,177,254
+0.2578125,144,178,254
+0.26171875,145,179,254
+0.265625,147,181,255
+0.26953125,148,182,255
+0.2734375,149,183,255
+0.27734375,151,184,255
+0.28125,152,185,255
+0.28515625,153,186,255
+0.2890625,155,187,255
+0.29296875,156,188,255
+0.296875,158,190,255
+0.30078125,159,191,255
+0.3046875,160,192,255
+0.30859375,162,193,255
+0.3125,163,194,255
+0.31640625,164,195,254
+0.3203125,166,196,254
+0.32421875,167,197,254
+0.328125,168,198,254
+0.33203125,170,199,253
+0.3359375,171,199,253
+0.33984375,172,200,253
+0.34375,174,201,253
+0.34765625,175,202,252
+0.3515625,176,203,252
+0.35546875,178,204,251
+0.359375,179,205,251
+0.36328125,180,205,251
+0.3671875,182,206,250
+0.37109375,183,207,250
+0.375,184,208,249
+0.37890625,185,208,248
+0.3828125,187,209,248
+0.38671875,188,210,247
+0.390625,189,210,247
+0.39453125,190,211,246
+0.3984375,192,212,245
+0.40234375,193,212,245
+0.40625,194,213,244
+0.41015625,195,213,243
+0.4140625,197,214,243
+0.41796875,198,214,242
+0.421875,199,215,241
+0.42578125,200,215,240
+0.4296875,201,216,239
+0.43359375,203,216,238
+0.4375,204,217,238
+0.44140625,205,217,237
+0.4453125,206,217,236
+0.44921875,207,218,235
+0.453125,208,218,234
+0.45703125,209,219,233
+0.4609375,210,219,232
+0.46484375,211,219,231
+0.46875,213,219,230
+0.47265625,214,220,229
+0.4765625,215,220,228
+0.48046875,216,220,227
+0.484375,217,220,225
+0.48828125,218,220,224
+0.4921875,219,220,223
+0.49609375,220,221,222
+0.5,221,221,221
+0.50390625,222,220,219
+0.5078125,223,220,218
+0.51171875,224,219,216
+0.515625,225,219,215
+0.51953125,226,218,214
+0.5234375,227,218,212
+0.52734375,228,217,211
+0.53125,229,216,209
+0.53515625,230,216,208
+0.5390625,231,215,206
+0.54296875,232,215,205
+0.546875,232,214,203
+0.55078125,233,213,202
+0.5546875,234,212,200
+0.55859375,235,212,199
+0.5625,236,211,197
+0.56640625,236,210,196
+0.5703125,237,209,194
+0.57421875,238,209,193
+0.578125,238,208,191
+0.58203125,239,207,190
+0.5859375,240,206,188
+0.58984375,240,205,187
+0.59375,241,204,185
+0.59765625,241,203,184
+0.6015625,242,202,182
+0.60546875,242,201,181
+0.609375,243,200,179
+0.61328125,243,199,178
+0.6171875,244,198,176
+0.62109375,244,197,174
+0.625,245,196,173
+0.62890625,245,195,171
+0.6328125,245,194,170
+0.63671875,245,193,168
+0.640625,246,192,167
+0.64453125,246,191,165
+0.6484375,246,190,163
+0.65234375,246,188,162
+0.65625,247,187,160
+0.66015625,247,186,159
+0.6640625,247,185,157
+0.66796875,247,184,156
+0.671875,247,182,154
+0.67578125,247,181,152
+0.6796875,247,180,151
+0.68359375,247,178,149
+0.6875,247,177,148
+0.69140625,247,176,146
+0.6953125,247,174,145
+0.69921875,247,173,143
+0.703125,247,172,141
+0.70703125,247,170,140
+0.7109375,247,169,138
+0.71484375,247,167,137
+0.71875,247,166,135
+0.72265625,246,164,134
+0.7265625,246,163,132
+0.73046875,246,161,131
+0.734375,246,160,129
+0.73828125,245,158,127
+0.7421875,245,157,126
+0.74609375,245,155,124
+0.75,244,154,123
+0.75390625,244,152,121
+0.7578125,244,151,120
+0.76171875,243,149,118
+0.765625,243,147,117
+0.76953125,242,146,115
+0.7734375,242,144,114
+0.77734375,241,142,112
+0.78125,241,141,111
+0.78515625,240,139,109
+0.7890625,240,137,108
+0.79296875,239,136,106
+0.796875,238,134,105
+0.80078125,238,132,103
+0.8046875,237,130,102
+0.80859375,236,129,100
+0.8125,236,127,99
+0.81640625,235,125,97
+0.8203125,234,123,96
+0.82421875,233,121,95
+0.828125,233,120,93
+0.83203125,232,118,92
+0.8359375,231,116,90
+0.83984375,230,114,89
+0.84375,229,112,88
+0.84765625,228,110,86
+0.8515625,227,108,85
+0.85546875,227,106,83
+0.859375,226,104,82
+0.86328125,225,102,81
+0.8671875,224,100,79
+0.87109375,223,98,78
+0.875,222,96,77
+0.87890625,221,94,75
+0.8828125,220,92,74
+0.88671875,218,90,73
+0.890625,217,88,71
+0.89453125,216,86,70
+0.8984375,215,84,69
+0.90234375,214,82,67
+0.90625,213,80,66
+0.91015625,212,78,65
+0.9140625,210,75,64
+0.91796875,209,73,62
+0.921875,208,71,61
+0.92578125,207,69,60
+0.9296875,205,66,59
+0.93359375,204,64,57
+0.9375,203,62,56
+0.94140625,202,59,55
+0.9453125,200,57,54
+0.94921875,199,54,53
+0.953125,198,51,52
+0.95703125,196,49,50
+0.9609375,195,46,49
+0.96484375,193,43,48
+0.96875,192,40,47
+0.97265625,190,37,46
+0.9765625,189,34,45
+0.98046875,188,30,44
+0.984375,186,26,43
+0.98828125,185,22,41
+0.9921875,183,17,40
+0.99609375,181,11,39
+1,180,4,38

examples/imageplot_userpal/palettes/CoolWarmUChar33.csv

@@ -0,0 +1,34 @@
+Scalar,R,G,B
+0,59,76,192
+0.03125,68,90,204
+0.0625,77,104,215
+0.09375,87,117,225
+0.125,98,130,234
+0.15625,108,142,241
+0.1875,119,154,247
+0.21875,130,165,251
+0.25,141,176,254
+0.28125,152,185,255
+0.3125,163,194,255
+0.34375,174,201,253
+0.375,184,208,249
+0.40625,194,213,244
+0.4375,204,217,238
+0.46875,213,219,230
+0.5,221,221,221
+0.53125,229,216,209
+0.5625,236,211,197
+0.59375,241,204,185
+0.625,245,196,173
+0.65625,247,187,160
+0.6875,247,177,148
+0.71875,247,166,135
+0.75,244,154,123
+0.78125,241,141,111
+0.8125,236,127,99
+0.84375,229,112,88
+0.875,222,96,77
+0.90625,213,80,66
+0.9375,203,62,56
+0.96875,192,40,47
+1,180,4,38

examples/imageplot_userpal/palettes/NSW_Discrete_Z_ColorMap.xml

@@ -0,0 +1,47 @@
+<!-- downloaded from http://www.rasmsys.com/page6/page14/page14.html -->
+<ColorMap name="NWS Discrete Z" space="RGB">
+  <Point x="-30.0" o="1" r="0.797" g="1.00" b="1.0"/>
+  <Point x="-25.01" o="1" r="0.797" g="1.00" b="1.0"/>
+  <Point x="-25.0" o="1" r="0.800" g="0.600" b="0.800"/>
+  <Point x="-20.01" o="1" r="0.800" g="0.600" b="0.800"/>
+  <Point x="-20.0" o="1" r="0.600" g="0.400" b="0.600"/>
+  <Point x="-15.01" o="1" r="0.600" g="0.400" b="0.600"/>
+  <Point x="-15.0" o="1" r="0.400" g="0.200" b="0.400"/>
+  <Point x="-10.01" o="1" r="0.400" g="0.200" b="0.400"/>
+  <Point x="-10.0" o="1" r="0.800" g="0.800" b="0.600"/>
+  <Point x="-5.01" o="1" r="0.800" g="0.800" b="0.600"/>
+  <Point x="-5.0" o="1" r="0.600" g="0.600" b="0.400"/>
+  <Point x="-0.01" o="1" r="0.600" g="0.600" b="0.400"/>
+  <Point x="0.0" o="1" r="0.392" g="0.392" b="0.392"/>
+  <Point x="4.99" o="1" r="0.392" g="0.392" b="0.392"/>
+  <Point x="5.0" o="1" r="0.016" g="0.914" b="0.906"/>
+  <Point x="9.99" o="1" r="0.016" g="0.914" b="0.906"/>
+  <Point x="10.0" o="1" r="0.004" g="0.624" b="0.957"/>
+  <Point x="14.99" o="1" r="0.004" g="0.624" b="0.957"/>
+  <Point x="15.0" o="1" r="0.012" g="0.000" b="0.957"/>
+  <Point x="19.99" o="1" r="0.012" g="0.000" b="0.957"/>
+  <Point x="20.0" o="1" r="0.008" g="0.992" b="0.008"/>
+  <Point x="24.99" o="1" r="0.008" g="0.992" b="0.008"/>
+  <Point x="25.0" o="1" r="0.004" g="0.773" b="0.004"/>
+  <Point x="29.99" o="1" r="0.004" g="0.773" b="0.004"/>
+  <Point x="30.0" o="1" r="0.000" g="0.557" b="0.000"/>
+  <Point x="34.99" o="1" r="0.000" g="0.557" b="0.000"/>
+  <Point x="35.0" o="1" r="0.992" g="0.973" b="0.008"/>
+  <Point x="39.99" o="1" r="0.992" g="0.973" b="0.008"/>
+  <Point x="40.0" o="1" r="0.898" g="0.737" b="0.000"/>
+  <Point x="44.99" o="1" r="0.898" g="0.737" b="0.000"/>
+  <Point x="45.0" o="1" r="0.992" g="0.584" b="0.000"/>
+  <Point x="49.99" o="1" r="0.992" g="0.584" b="0.000"/>
+  <Point x="50.0" o="1" r="0.992" g="0.000" b="0.000"/>
+  <Point x="54.99" o="1" r="0.992" g="0.000" b="0.000"/>
+  <Point x="55.0" o="1" r="0.831" g="0.000" b="0.000"/>
+  <Point x="59.99" o="1" r="0.831" g="0.000" b="0.000"/>
+  <Point x="60.0" o="1" r="0.737" g="0.000" b="0.000"/>
+  <Point x="64.99" o="1" r="0.737" g="0.000" b="0.000"/>
+  <Point x="65.0" o="1" r="0.973" g="0.000" b="0.992"/>
+  <Point x="69.99" o="1" r="0.973" g="0.000" b="0.992"/>
+  <Point x="70.0" o="1" r="0.596" g="0.329" b="0.776"/>
+  <Point x="74.99" o="1" r="0.596" g="0.329" b="0.776"/>
+  <Point x="75.0" o="1" r="1.000" g="1.000" b="1.000"/>
+  <Point x="99.99" o="1" r="1.000" g="1.000" b="1.000"/>
+</ColorMap>

lib/jkqtcommon/CMakeLists.txt

@@ -73,7 +73,7 @@ if(BUILD_SHARED_LIBS)
     add_library(${libsh_name} SHARED  ${SOURCES} ${HEADERS})
     set_property(TARGET ${libsh_name} PROPERTY VERSION "${PROJECT_VERSION}")
     set_property(TARGET ${libsh_name} PROPERTY OUTPUT_NAME  "${libsh_name_decorated}")
-    target_link_libraries(${libsh_name} Qt5::Core Qt5::Gui Qt5::Widgets Qt5::PrintSupport)
+    target_link_libraries(${libsh_name} Qt5::Core Qt5::Gui Qt5::Xml Qt5::Widgets Qt5::PrintSupport)
     target_compile_definitions(${libsh_name} PUBLIC JKQTCOMMON_LIB_IN_DLL)
     target_compile_definitions(${libsh_name} PRIVATE JKQTCOMMON_LIB_EXPORT_LIBRARY)
     set_property(TARGET ${libsh_name} PROPERTY WINDOWS_EXPORT_ALL_SYMBOLS "ON")
@@ -86,7 +86,7 @@ if(BUILD_STATIC_LIBS)
     add_library(${lib_name} STATIC  ${SOURCES} ${HEADERS})
     set_property(TARGET ${lib_name} PROPERTY VERSION "${PROJECT_VERSION}")
     set_property(TARGET ${lib_name} PROPERTY OUTPUT_NAME  "${lib_name_decorated}")
-    target_link_libraries(${lib_name} Qt5::Core Qt5::Gui Qt5::Widgets Qt5::PrintSupport)
+    target_link_libraries(${lib_name} Qt5::Core Qt5::Gui Qt5::Xml Qt5::Widgets Qt5::PrintSupport)
     write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${lib_name}Version.cmake
                                      VERSION ${PROJECT_VERSION} 
                                      COMPATIBILITY AnyNewerVersion )    

lib/jkqtcommon/jkqtpbasicimagetools.h

@@ -24,38 +24,40 @@
 #include <QDebug>
 #include <QImage>
 #include <QStringList>
-#include "jkqtcommon/jkqtcommon_imexport.h"
 #include <cmath>
 #include <cfloat>
 #include <stdint.h>
 #include <QColor>
+#include "jkqtcommon/jkqtcommon_imexport.h"
+#include "jkqtcommon/jkqtpmathtools.h"
 
-/*! \brief tool structure that summarizes several static properties
-    \ingroup jkqtptools_qt
-    \internal
-*/
-struct JKQTPImageTools {
 
-        /*! \brief Width of the Palette-Icons, generated e.g. by JKQTPMathImageGetPaletteIcon()
+/*! \brief retrieve an R/G/B/Alpha (\a ch == 0/1/2/3) value from the \c QRgb value \a rgb
-            \ingroup jkqtptools_qt */
+    \ingroup jkqtplotter_imagelots_tools
-        static JKQTCOMMON_LIB_EXPORT const int PALETTE_ICON_WIDTH;
+ */
-        /*! \brief Height of the Palette-Icons, generated e.g. by JKQTPMathImageGetPaletteIcon()
+inline int JKQTPGetColorChannel(QRgb rgb, int ch)
-            \ingroup jkqtptools_qt */
+{
-        static JKQTCOMMON_LIB_EXPORT const int PALETTE_IMAGEICON_HEIGHT;
+    switch(ch) {
-
+        case 0: return qRed(rgb);
-        /*! \brief size of the lookup tables used by JKQTFPimagePlot_array2image()
+        case 1: return qGreen(rgb);
-            \ingroup jkqtplotter_imagelots_tools
+        case 2: return qBlue(rgb);
-        */
+        case 3: return qAlpha(rgb);
-        static JKQTCOMMON_LIB_EXPORT const int LUTSIZE;
+    }
-
+    return qGray(rgb);
-		/*! \brief internal global storage object for lookup-tables
+}
-			\ingroup jkqtplotter_imagelots_tools
-			\internal
-			*/
-		static JKQTCOMMON_LIB_EXPORT QList<int*> global_jkqtpimagetools_lutstore;
-
-};
 
+/*! \brief set the R/G/B/Alpha (\a ch == 0/1/2/3) value in the \c QRgb value \a rgb to \a val (0..255!)
+    \ingroup jkqtplotter_imagelots_tools
+ */
+inline void JKQTPSetColorChannel(QRgb& rgb, int ch, int val)
+{
+    switch(ch) {
+        case 0: rgb= qRgba(val, qGreen(rgb), qBlue(rgb), qAlpha(rgb)); break;
+        case 1: rgb= qRgba(qRed(rgb), val, qBlue(rgb), qAlpha(rgb)); break;
+        case 2: rgb= qRgba(qRed(rgb), qGreen(rgb), val, qAlpha(rgb)); break;
+        case 3: rgb= qRgba(qRed(rgb), qGreen(rgb), qBlue(rgb), val); break;
+    }
+}
 
 /*! \brief available palettes for coloring an image
     \ingroup jkqtplotter_imagelots_tools
@@ -91,10 +93,25 @@ enum JKQTPMathImageColorPalette {
     JKQTPMathImageINVERTED_OCEAN, /*!< \image html palettes/palette_invocean.png */
     JKQTPMathImageTRAFFICLIGHT, /*!< \image html palettes/palette_trafficlight.png */
     JKQTPMathImageINVERTED_TRAFFICLIGHT, /*!< \image html palettes/palette_invtrafficlight.png */
+
+    JKQTPMathImageBone, /*!< \image html palettes/palette_bone.png */
+    JKQTPMathImageCool, /*!< \image html palettes/palette_cool.png */
+    JKQTPMathImageCopper, /*!< \image html palettes/palette_copper.png */
+    JKQTPMathImageAutumn, /*!< \image html palettes/palette_autumn.png */
+    JKQTPMathImageSeismic, /*!< \image html palettes/palette_seismic.png */
+    JKQTPMathImageTerrain, /*!< \image html palettes/palette_terrain.png */
+    JKQTPMathImageViridis, /*!< \image html palettes/palette_viridis.png \see from https://github.com/BIDS/colormap/blob/master/colormaps.py  https://github.com/BIDS/colormap/blob/master/colormaps.py */
+    JKQTPMathImageMagma, /*!< \image html palettes/palette_magma.png \see from https://github.com/BIDS/colormap/blob/master/colormaps.py  https://github.com/BIDS/colormap/blob/master/colormaps.py */
+    JKQTPMathImageInferno, /*!< \image html palettes/palette_inferno.png \see from https://github.com/BIDS/colormap/blob/master/colormaps.py  https://github.com/BIDS/colormap/blob/master/colormaps.py */
+    JKQTPMathImagePlasma, /*!< \image html palettes/palette_plasma.png \see from https://github.com/BIDS/colormap/blob/master/colormaps.py  https://github.com/BIDS/colormap/blob/master/colormaps.py */
+
+
     JKQTPMathImageBLUEMAGENTAYELLOW, /*!< \image html palettes/palette_BlMaYe.png */
     JKQTPMathImageINVERTED_BLUEMAGENTAYELLOW, /*!< \image html palettes/palette_YeMaBl.png */
+    JKQTPMathImageYELLOWMAGENTABLUE=JKQTPMathImageINVERTED_BLUEMAGENTAYELLOW, /*!< \image html palettes/palette_YeMaBl.png */
     JKQTPMathImageBLUEYELLOW, /*!< \image html palettes/palette_BlYe.png */
     JKQTPMathImageINVERTED_BLUEYELLOW, /*!< \image html palettes/palette_YeBl.png */
+    JKQTPMathImageYELLOWBLUE=JKQTPMathImageINVERTED_BLUEYELLOW, /*!< \image html palettes/palette_YeBl.png */
 
     JKQTPMathImageBLUEWHITERED, /*!< \image html palettes/palette_bluewhitered.png */
     JKQTPMathImageREDWHITEBLUE, /*!< \image html palettes/palette_redwhiteblue.png */
@@ -104,10 +121,15 @@ enum JKQTPMathImageColorPalette {
     JKQTPMathImageBLACKBLUEWHITEYELLOWWHITE, /*!< \image html palettes/palette_BWprint.png */
     JKQTPMathImageWHITEYELLOWWHITEBLUEBLACK, /*!< \image html palettes/palette_invBWprint.png */
     JKQTPMathImageBR_GR, /*!< \image html palettes/palette_BrBG.png */
+    JKQTPMathImageBrownGreen=JKQTPMathImageBR_GR, /*!< \image html palettes/palette_BrBG.png */
     JKQTPMathImagePU_OR, /*!< \image html palettes/palette_PuOr.png */
+    JKQTPMathImageOrangeWhitePurple=JKQTPMathImagePU_OR, /*!< \image html palettes/palette_PuOr.png */
     JKQTPMathImageGN_BU, /*!< \image html palettes/palette_greenblue.png */
+    JKQTPMathImageGreenBlue=JKQTPMathImageGN_BU, /*!< \image html palettes/palette_greenblue.png */
     JKQTPMathImageBU_GN, /*!< \image html palettes/palette_bluegreen.png */
+    JKQTPMathImageBlueGreen=JKQTPMathImageBU_GN, /*!< \image html palettes/palette_bluegreen.png */
     JKQTPMathImageYL_GN_BU, /*!< \image html palettes/palette_YeGnBu.png */
+    JKQTPMathImageYellowGreenBlue=JKQTPMathImageYL_GN_BU, /*!< \image html palettes/palette_YeGnBu.png */
 
     JKQTPMathImageBR_GR_STEP, /*!< \image html palettes/palette_stepsBrBG.png */
     JKQTPMathImagePU_OR_STEP, /*!< \image html palettes/palette_stepsPuOr.png */
@@ -118,38 +140,33 @@ enum JKQTPMathImageColorPalette {
 
     JKQTPMathImageCYANWHITE, /*!< \image html palettes/palette_cyanwhite.png */
     JKQTPMathImageINVERTED_CYANWHITE, /*!< \image html palettes/palette_whitecyan.png */
+    JKQTPMathImageWHITECYAN=JKQTPMathImageINVERTED_CYANWHITE, /*!< \image html palettes/palette_whitecyan.png */
     JKQTPMathImageYELLOWWHITE, /*!< \image html palettes/palette_yellowwhite.png */
     JKQTPMathImageINVERTED_YELLOWWHITE, /*!< \image html palettes/palette_whiteyellow.png */
+    JKQTPMathImageWHITEYELLOW=JKQTPMathImageINVERTED_YELLOWWHITE, /*!< \image html palettes/palette_whiteyellow.png */
     JKQTPMathImageMAGENTAWHITE, /*!< \image html palettes/palette_magentawhite.png */
     JKQTPMathImageINVERTED_MAGENTAWHITE, /*!< \image html palettes/palette_whitemagenta.png */
+    JKQTPMathImageWHITEMAGENTA=JKQTPMathImageINVERTED_MAGENTAWHITE, /*!< \image html palettes/palette_whitemagenta.png */
     JKQTPMathImageBlueGreenRed, /*!< \image html palettes/palette_bluegreenred.png */
     JKQTPMathImageRedGreenBlue, /*!< \image html palettes/palette_redgreenblue.png */
+    JKQTPMathImageMagentaYellow, /*!< \image html palettes/palette_magentayellow.png */
+    JKQTPMathImageYellowMagenta, /*!< \image html palettes/palette_yellowmagenta.png */
+    JKQTPMathImageRedBlue, /*!< \image html palettes/palette_redblue.png */
+    JKQTPMathImageBlueRed, /*!< \image html palettes/palette_bluered.png */
 
-    JKQTPMathImagePREDEFINED_PALETTES_COUNT,
+    JKQTPMathImagePREDEFINED_PALETTES_COUNT, /*!< \brief the number of predefined palettes */
 
-    JKQTPMathImageUSER_PALETTE=65000,
+    JKQTPMathImageUSER_PALETTE=65000, /*!< \brief special value for JKQTPImageTools::array2image(), which signals the usage of a provided user-defined palette */
 
-    JKQTPMathImageALPHA=JKQTPMathImageUSER_PALETTE-2,
+    JKQTPMathImageALPHA=JKQTPMathImageUSER_PALETTE-2, /*!< \brief special palette with increasing alpha values */
-    JKQTPMathImageINVERTED_ALPHA=JKQTPMathImageUSER_PALETTE-1
+    JKQTPMathImageINVERTED_ALPHA=JKQTPMathImageUSER_PALETTE-1, /*!< \brief special palette with decreasing alpha values */
+
+    JKQTPMathImageFIRST_REGISTERED_USER_PALETTE=JKQTPMathImagePREDEFINED_PALETTES_COUNT,  /*!< \brief the ID of the first user-defined paletted, registered with JKQTPImageTools::registerPalette() or JKQTPImageTools::registerPalettesFromFile() */
+    JKQTPMathImageLAST_POSSIBLE_REGISTERED_USER_PALETTE=JKQTPMathImageUSER_PALETTE-10,  /*!< \brief the ID of the first user-defined paletted, registered with JKQTPImageTools::registerPalette() or JKQTPImageTools::registerPalettesFromFile() */
 };
 
 
 
-
-/*! \brief convert the palette \a p to a string
-    \ingroup jkqtplotter_imagelots_tools
-    \see String2JKQTPMathImageColorPalette()
- */
-JKQTCOMMON_LIB_EXPORT QString JKQTPMathImageColorPalette2String(JKQTPMathImageColorPalette p);
-
-/*! \brief convert the palette name \a p to JKQTPMathImageColorPalette (compatible with String2JKQTPMathImageColorPalette() )
-    \ingroup jkqtplotter_imagelots_tools
-    \see JKQTPMathImageColorPalette2String()
- */
-JKQTCOMMON_LIB_EXPORT JKQTPMathImageColorPalette String2JKQTPMathImageColorPalette(const QString& p);
-
-
-
 /*! \brief modes available for image pixels that are above/below the pixel value range
     \ingroup jkqtplotter_imagelots_tools
  */
@@ -159,6 +176,316 @@ enum JKQTPMathImageColorRangeFailAction {
     JKQTPMathImageTransparent=2 /*!< set transparent */
 };
 
+/*! \brief tool structure that summarizes several static properties of JKQTPlotters palette system,
+           also provides functions to work with palettes and register user-defined palettes.
+    \ingroup jkqtptools_qt
+
+    \see \ref JKQTPlotterImagePlot
+*/
+struct JKQTPImageTools {
+
+        /*! \brief Datatype to store lookup-tables used to map data values (scales to 0..size-1) onto RGB-colors
+            \ingroup jkqtptools_qt */
+        typedef QVector<QRgb> LUTType;
+
+        /*! \brief Width of the Palette-Icons, generated e.g. by JKQTPImageTools::GetPaletteIcon()
+            \ingroup jkqtptools_qt */
+        static JKQTCOMMON_LIB_EXPORT const int PALETTE_ICON_WIDTH;
+        /*! \brief Height of the Palette-Icons, generated e.g. by JKQTPImageTools::GetPaletteIcon()
+            \ingroup jkqtptools_qt */
+        static JKQTCOMMON_LIB_EXPORT const int PALETTE_IMAGEICON_HEIGHT;
+
+        /*! \brief size of the lookup tables used by JKQTFPimagePlot_array2image()
+        */
+        static JKQTCOMMON_LIB_EXPORT const int LUTSIZE;
+
+        /*! \brief loads all palettes defined in the given palette files \a filename into global_jkqtpimagetools_userluts
+                   and assigns a new LUT-ID >=JKQTPMathImageFIRST_REGISTERED_USER_PALETTE to each palette
+                   All new IDs are returned as a list
+
+
+            The file might either be a palette XML-file or a CSV-file:
+
+            \b CSV-files need to have one of the following two formats (RED/GREEN/BLUE: 0..255):
+            \verbatim
+            scalar, red, green, blue
+            scalar, red, green, blue
+            ...
+            \endverbatim
+            or simply
+            \verbatim
+            red, green, blue
+            red, green, blue
+            ...
+            \endverbatim
+            The parser will also allow tabs and whitespaces as column separators.
+
+
+            \b CML-files need to have one of the following two formats (RED/GREEN/BLUE/OPACITY: 0..1):
+            \verbatim
+                <ColorMap name="PALETTENAME" space="RGB">
+                  <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+                  <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+                  ...
+                </ColorMap>
+            \endverbatim
+            optionally several \c <ColorMap>...</ColorMap> definitions may be put below an arbitrarily named
+            document node, e.g.:
+            \verbatim
+                <ColorMaps>
+                    <ColorMap name="PALETTENAME" space="RGB">
+                      <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+                      <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+                      ...
+                    </ColorMap>
+                    <ColorMap name="PALETTENAME" space="RGB">
+                      <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+                      <Point x="scalar" r="RED" g="GREEN" b="BLUE"/>
+                      ...
+                    </ColorMap>
+                    ...
+                </ColorMaps>
+            \endverbatim
+
+            \note In both cases, the palette will be formed without interpolation, i.e. using JKQTPBuildColorPaletteLUT() .
+                  If in addition \a interpolatePalette is set to \c true, the function JKQTPBuildColorPaletteLUTLinInterpolate()
+                  is used instead.
+
+            \see \ref JKQTPlotterImagePlot , JKQTPBuildColorPaletteLUT()
+            */
+        static JKQTCOMMON_LIB_EXPORT QVector<int> registerPalettesFromFile(const QString& filename, bool interpolatePalette=false);
+
+        /*! \brief registers a new LUT defined by \a paletteLut and with the given \a name (computer-readable) for later use, optionally stores also the human-readable and localized name \a nameT
+                   and assigns a new LUT-ID >=JKQTPMathImageFIRST_REGISTERED_USER_PALETTE to the palette and returns it
+
+            \see \ref JKQTPlotterImagePlot, JKQTPBuildColorPaletteLUTLinInterpolate(), JKQTPBuildColorPaletteLUT(), JKQTPBuildColorPaletteLUTLinInterpolateSorted(), JKQTPBuildColorPaletteLUTSorted(), JKQTPBuildColorPaletteLUTLinInterpolate(), JKQTPBuildColorPaletteLUT()
+            */
+        static JKQTCOMMON_LIB_EXPORT int registerPalette(const QString& name, const LUTType &paletteLut, const QString &nameT=QString());
+
+
+
+
+
+
+
+
+        /*! \brief convert a 2D image (as 1D array) into a QImage with given palette (see JKQTFPColorPalette)
+
+            \param dbl_in pointer to a 1D array of template type \c T representing the image to plot. This array has to be of size \a width * \a height
+            \param width width of the array in \a dbl
+            \param height height of the array in \a dbl
+            \param[out] img the QImage object to draw to (should be initialized as \c QImage::Format_ARGB32 )
+            \param palette the color palette to use for the display
+            \param minColor lower boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
+            \param maxColor upper boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
+            \param paletteMinFail specifies what shell happen, when a value in \a dbl is below \a minColor
+            \param paletteMaxFail specifies what shell happen, when a value in \a dbl is above \a maxColor
+            \param minFailColor color to use for pixels that are below \a minColor for some settings of \a paletteMinFail
+            \param maxFailColor color to use for pixels that are below \a maxColor for some settings of \a paletteMaxFail
+            \param nanColor color to use for pixels that are not-a-number
+            \param infColor color to use for pixels that are infinity
+            \param logScale create a log-scaled image
+            \param logBase base for the logarithm used when \c logScale==true
+            \param lutUser user define LUT, used if \a palette \c ==JKQTPMathImageUSER_PALETTE
+                           \note There is a variant of this function that is called with a userLUT directly, instead of \a palette
+        */
+        template <class T>
+        static inline void array2image(const T* dbl_in, int width, int height, QImage &img, JKQTPMathImageColorPalette palette, double minColor, double maxColor, JKQTPMathImageColorRangeFailAction paletteMinFail=JKQTPMathImageLastPaletteColor, JKQTPMathImageColorRangeFailAction paletteMaxFail=JKQTPMathImageLastPaletteColor, QColor minFailColor=QColor("black"), QColor maxFailColor=QColor("black"), QColor nanColor=QColor("black"), QColor infColor=QColor("black"), bool logScale=false, double logBase=10.0, const LUTType& lutUser=LUTType())
+        {
+            if (!dbl_in || width<=0 || height<=0)
+                    return;
+
+            double min = *dbl_in;
+            double max = *dbl_in;
+            if (jkqtp_approximatelyEqual(minColor, maxColor, JKQTP_DOUBLE_EPSILON)) {
+                bool first=true;
+                for (int i=1; i<width*height; ++i)
+                {
+                    T v=dbl_in[i];
+                    if (!(std::isnan(static_cast<long double>(v)) || std::isinf(static_cast<long double>(v)))) {
+                        if (first) {
+                            min=max=v;
+                            first=false;
+                        } else {
+                            if (v < min)
+                                min = v;
+                            else if (v > max)
+                                max = v;
+                        }
+                    }
+                }
+
+            } else {
+                min = minColor;
+                max = maxColor;
+            }
+
+            const T* dbl=dbl_in;
+            QVector<T> dbl1;
+            if (logScale) {
+                double logB=log10(logBase);
+                dbl1=QVector<T>(width*height, 0);
+                for (int i=0; i<width*height; i++) {
+                    dbl1[i]=log10(dbl_in[i])/logB;
+                }
+                dbl=dbl1.data();
+                min=log10(min)/logB;
+                max=log10(max)/logB;
+            }
+            double delta=max-min;
+
+
+            // either use lutUser (if palette==JKQTPMathImageUSER_PALETTE) or else read the LUT from the internal storage
+            const LUTType& lut_used=(palette==JKQTPMathImageUSER_PALETTE)?lutUser:getLUTforPalette(JKQTPImageTools::global_jkqtpimagetools_lutstore, palette);
+
+            img = QImage(width, height, QImage::Format_ARGB32);
+            if (jkqtp_approximatelyEqual(min, max, JKQTP_DOUBLE_EPSILON)) {
+                    img.fill(0);
+            } else {
+                const int lutSize=lut_used.size();
+                if (lutSize>0) {
+                    // LUT found: collor the image accordingly
+                    for (int j=0; j<height; ++j) {
+                        QRgb* line=reinterpret_cast<QRgb*>(img.scanLine(height-1-j));
+                        for (int i=0; i<width; ++i) {
+                            double val=dbl[j*width+i];
+                            if (std::isnan(val)) {
+                                line[i]=nanColor.rgba();
+                            } else if (std::isinf(val)) {
+                                line[i]=infColor.rgba();
+                            } else {
+                                const int v = static_cast<int>((val-min)/delta*static_cast<double>(lutSize-1));
+                                const int vv = (v < 0) ? 0 : ( (v >= lutSize) ? (lutSize-1) : v);
+                                line[i]=lut_used[vv];
+                                if ((v<0)&&(paletteMinFail==JKQTPMathImageGivenColor)) {
+                                    line[i]=minFailColor.rgba();
+                                } else if ((v>lutSize)&&(paletteMaxFail==JKQTPMathImageGivenColor)) {
+                                    line[i]=maxFailColor.rgba();
+                                } else if ((v<0)&&(paletteMinFail==JKQTPMathImageTransparent)) {
+                                    line[i]=QColor(Qt::transparent).rgba();
+                                } else if ((v>lutSize)&&(paletteMaxFail==JKQTPMathImageTransparent)) {
+                                    line[i]=QColor(Qt::transparent).rgba();
+                                }
+                            }
+                        }
+                    }
+                } else {
+                    // no LUT found: paint a black image!
+                    img.fill(0);
+                }
+            }
+
+        }
+
+        /*! \brief convert a 2D image (as 1D array) into a QImage with given palette (see JKQTFPColorPalette)
+
+            \param dbl_in pointer to a 1D array of template type \c T representing the image to plot. This array has to be of size \a width * \a height
+            \param width width of the array in \a dbl
+            \param height height of the array in \a dbl
+            \param[out] img the QImage object to draw to (should be initialized as \c QImage::Format_ARGB32 )
+            \param lutUser user-defined lookup-table
+            \param minColor lower boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
+            \param maxColor upper boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
+            \param paletteMinFail specifies what shell happen, when a value in \a dbl is below \a minColor
+            \param paletteMaxFail specifies what shell happen, when a value in \a dbl is above \a maxColor
+            \param minFailColor color to use for pixels that are below \a minColor for some settings of \a paletteMinFail
+            \param maxFailColor color to use for pixels that are below \a maxColor for some settings of \a paletteMaxFail
+            \param nanColor color to use for pixels that are not-a-number
+            \param infColor color to use for pixels that are infinity
+            \param logScale create a log-scaled image
+            \param logBase base for the logarithm used when \c logScale==true
+        */
+        template <class T>
+        static inline void array2image(const T* dbl_in, int width, int height, QImage &img, const LUTType& lutUser, double minColor, double maxColor, JKQTPMathImageColorRangeFailAction paletteMinFail=JKQTPMathImageLastPaletteColor, JKQTPMathImageColorRangeFailAction paletteMaxFail=JKQTPMathImageLastPaletteColor, QColor minFailColor=QColor("black"), QColor maxFailColor=QColor("black"), QColor nanColor=QColor("black"), QColor infColor=QColor("black"), bool logScale=false, double logBase=10.0)
+        {
+            array2image(dbl_in,  width,  height, img,  JKQTPMathImageUSER_PALETTE, minColor, maxColor,  paletteMinFail,  paletteMaxFail,  minFailColor,  maxFailColor,  nanColor,  infColor,  logScale,  logBase, lutUser);
+        }
+
+
+
+        /*! \brief return a list of all globally available LUTs, human-readable/localized form */
+        static QStringList JKQTCOMMON_LIB_EXPORT getPredefinedPalettes();
+
+        /*! \brief return a list of all globally available LUTs, machine-readable form */
+        static QStringList JKQTCOMMON_LIB_EXPORT getPredefinedPalettesMachineReadable();
+
+        /*! \brief convert the palette \a p to a string
+            \see JKQTPImageTools::String2JKQTPMathImageColorPalette()
+         */
+        static JKQTCOMMON_LIB_EXPORT QString JKQTPMathImageColorPalette2String(JKQTPMathImageColorPalette p);
+
+        /*! \brief convert the palette name \a p to JKQTPMathImageColorPalette (compatible with JKQTPImageTools::String2JKQTPMathImageColorPalette() )
+            \see JKQTPImageTools::JKQTPMathImageColorPalette2String()
+         */
+        static JKQTCOMMON_LIB_EXPORT JKQTPMathImageColorPalette String2JKQTPMathImageColorPalette(const QString& p);
+
+
+        /*! \brief generates a QImage with width \a width and height 1 for the i-th color palette (\a i is based on the list returned by JKQTPImagePlot_getPredefinedPalettes() ) */
+        static QImage JKQTCOMMON_LIB_EXPORT GetPaletteImage(int i, int width);
+        /*! \brief generates a QImage with width \a width and height \a height for the i-th color palette (\a i is based on the list returned by JKQTPImagePlot_getPredefinedPalettes() ) */
+        static QImage JKQTCOMMON_LIB_EXPORT GetPaletteImage(int i, int width, int height);
+        /*! \brief generates a QImage with width \a width and height 1 for a specific JKQTPMathImageColorPalette */
+        static QImage JKQTCOMMON_LIB_EXPORT GetPaletteImage(JKQTPMathImageColorPalette palette, int width);
+        /*! \brief generates a QImage with width \a width and height \a height for a specific JKQTPMathImageColorPalette */
+        static QImage JKQTCOMMON_LIB_EXPORT GetPaletteImage(JKQTPMathImageColorPalette palette, int width, int height);
+        /*! \brief generates a QImage with width \a width and height 1 for a lookup-table \a lut */
+        static QImage JKQTCOMMON_LIB_EXPORT GetPaletteImage(const LUTType& lut, int width);
+
+        /*! \brief generates a QIcon for the i-th color palette (\a i is based on the list returned by JKQTPImagePlot_getPredefinedPalettes() ) */
+        static QIcon JKQTCOMMON_LIB_EXPORT GetPaletteIcon(int i) ;
+
+
+        /*! \brief generates a QIcon for a specific JKQTPMathImageColorPalette */
+        static QIcon JKQTCOMMON_LIB_EXPORT GetPaletteIcon(JKQTPMathImageColorPalette palette) ;
+
+    private:
+
+        /*! \brief internal datatype, representing a lookup-table and its metadata inside global_jkqtpimagetools_lutstore
+            \internal
+            */
+        struct LUTData {
+            LUTData();
+            LUTData(const LUTType& _lut, const QString& _name, const QString& _nameT);
+            LUTData(const QString& _name, const QString& _nameT);
+            /** \brief the LUT itself */
+            LUTType lut;
+            /** \brief name for the LUT (machine-readable) */
+            QString name;
+            /** \brief name for the LUT (localized, human-readable) */
+            QString nameT;
+        };
+
+        /*! \brief internal global storage object for lookup-tables
+            \internal
+            */
+        static JKQTCOMMON_LIB_EXPORT QMap<int, LUTData > global_jkqtpimagetools_lutstore;
+
+        /*! \brief storage for the next ID to assign to a user-defined palette, registered with registerPalette() or registerPalettesFromFile()
+            \internal
+
+            \see registerPalette() registerPalettesFromFile()
+            */
+        static JKQTCOMMON_LIB_EXPORT int global_next_userpalette;
+
+        /*! \brief returns data of the default LUTs, used to initialize global_jkqtpimagetools_lutstore
+            \internal
+            */
+        static JKQTCOMMON_LIB_EXPORT QMap<int, LUTData > getDefaultLUTs();
+
+
+        /*! \brief create a LUT for a given JKQTPMathImageColorPalette, store it in \a lutstore and return it
+            \internal
+            */
+        static JKQTCOMMON_LIB_EXPORT const LUTType& getLUTforPalette(QMap<int, LUTData > &lutcache, JKQTPMathImageColorPalette palette);
+
+};
+
+
+
+
+
+
+
 
 /*! \brief modes available for RGB images
     \ingroup jkqtplotter_imagelots_tools
@@ -175,19 +502,6 @@ enum JKQTPRGBMathImageRGBMode {
 };
 
 
-/*! \brief returns a vector containing all elements of the given array
-    \ingroup jkqtplotter_imagelots_tools
-
-*/
-template <class T>
-inline QVector<T> JKQTPImagePlot_arrayToVector(const T* input, int N) {
-    if (!input || N<=0) return QVector<double>();
-    T dummy;
-    QVector<T> out(N, dummy);
-    memcpy(out.data(), input, N*sizeof(T));
-    return out;
-}
-
 /*! \brief returns a vector containing all elements of the given array as doubles
     \ingroup jkqtplotter_imagelots_tools
 
@@ -302,7 +616,7 @@ inline void JKQTPImagePlot_array2RGBimage(T* dbl_in, int width, int height, QIma
     double min = *dbl_in;
     double max = *dbl_in;
     bool first=true;
-    if (minColor == maxColor) {
+    if (jkqtp_approximatelyEqual(minColor, maxColor, JKQTP_DOUBLE_EPSILON)) {
         for (int i=1; i<width*height; ++i)
         {
             T v=dbl_in[i];
@@ -327,7 +641,7 @@ inline void JKQTPImagePlot_array2RGBimage(T* dbl_in, int width, int height, QIma
     T* dbl=dbl_in;
     if (logScale) {
         double logB=log10(logBase);
-        dbl=(T*)malloc(width*height*sizeof(T));
+        dbl=static_cast<T*>(malloc(width*height*sizeof(T)));
         //memcpy(dbl, dbl_in, width*height*sizeof(T));
         for (int i=0; i<width*height; i++) {
             dbl[i]=log10(dbl_in[i])/logB;
@@ -337,7 +651,7 @@ inline void JKQTPImagePlot_array2RGBimage(T* dbl_in, int width, int height, QIma
     }
     double delta=max-min;
 
-    if (min != max) {
+    if (jkqtp_approximatelyUnequal(minColor, maxColor, JKQTP_DOUBLE_EPSILON)) {
         if (rgbMode==JKQTPRGBMathImageModeRGBMode) {
             //qDebug()<<"RGBMode";
             if (channel==0) {
@@ -539,263 +853,184 @@ inline void JKQTPImagePlot_array2RGBimage(T* dbl_in, int width, int height, QIma
 }
 
 
-/*! \brief Generate a QList with \a N entries of the value \a defaultValue
-    \ingroup jkqtptools_qt */
-template <typename T>
-inline QList<T> JKQTPImagePlot_makeQList(const T& defaultVal, int N=1) {
-    QList<T> l;
-    for (int i=0; i<N; i++) l<<defaultVal;
-    return l;
-}
 
 
 
 
-/*! \brief build a linearly interpolated palette in \a lut with \a N entries that are provided in \a items
+/*! \brief for building palettes from linear segments of single colors using JKQTPBuildColorPaletteLUTLinSegmentsSorted() and JKQTPBuildColorPaletteLUTLinSegments()
-    \ingroup jkqtplotter_imagelots_tools
+    \ingroup jkqtplotter_imagelots_tools_LUTS
 
-    The entries in \a items are sorted by the first (double) argument and the full range is distributed
+    \see JKQTPBuildColorPaletteLUTLinSegmentsSorted() and JKQTPBuildColorPaletteLUTLinSegments(), \ref JKQTPlotterImagePlotUserPalette
-    over 0 ... lut_size. Values in the LUT in between are generated by linear interpolations
 
-    \a lut needs to have \c lut_size) entries
 */
-void JKQTCOMMON_LIB_EXPORT JKQTPImagePlot_buildDefinedPaletteLinInterpolate(int* lut, QList<QPair<double, QRgb> > items, int lut_size=JKQTPImageTools::LUTSIZE);
+struct JKQTPColorPaletteSingleColorLinSegment {
-
+    JKQTPColorPaletteSingleColorLinSegment(double p, uint8_t y1, uint8_t y2);
-/*! \brief build a linearly interpolated palette in \a lut with \a N entries that are provided as (double, QRgb) value pairss in the variable arguments
+    static JKQTPColorPaletteSingleColorLinSegment makeDbl_0_1(double p, double y1, double y2);
-    \ingroup jkqtplotter_imagelots_tools
+    JKQTPColorPaletteSingleColorLinSegment();
-
+    /** \brief scalar position of the element on the value axis */
-    The entries in \a items are sorted by the first (double) argument and the full range is distributed
+    double position;
-    over 0 ... lut_size. Values in the LUT in between are generated by linear interpolations
+    /** \brief color-channel-value that ends the prevoius segment (ignored for the first entry in a table) */
-
+    uint8_t colval_endprevious;
-    \a lut needs to have \c lut_size) entries
+    /** \brief color-channel-value that starts the next segment (ignored for the last entry in a table) */
-*/
+    uint8_t colval_startnext;
-void JKQTCOMMON_LIB_EXPORT JKQTPImagePlot_buildDefinedPaletteLinInterpolate(int* lut, int N, ...);
-
-/*! \brief build a palette in \a lut with \a N entries that are provided in \a items
-    \ingroup jkqtplotter_imagelots_tools
-
-    The entries in \a items are sorted by the first (double) argument and the full range is distributed
-    over 0 ... JKQTPImageTools::LUTSIZE.
-
-    \a lut needs to have \c JKQTPImageTools::LUTSIZE) entries
-*/
-void JKQTCOMMON_LIB_EXPORT JKQTPImagePlot_buildDefinedPalette(int* lut, QList<QPair<double, QRgb> > items);
-
-/*! \brief build a palette in \a lut with \a N entries that are provided as as (double, QRgb) value pairss in the variable arguments
-    \ingroup jkqtplotter_imagelots_tools
-*/
-void JKQTCOMMON_LIB_EXPORT JKQTPImagePlot_buildDefinedPalette(int* lut, int N, ...);
-
-/*! \brief return a list of all globally available LUTs
-    \ingroup jkqtplotter_imagelots_tools */
-QStringList JKQTCOMMON_LIB_EXPORT JKQTPImagePlot_getPredefinedPalettes();
-
-
-
-/*! \brief create a LUT for a given JKQTPMathImageColorPalette, store it in \a lutstore and return it
-    \ingroup jkqtplotter_imagelots_tools
-    \internal
-    */
-JKQTCOMMON_LIB_EXPORT int* JKQTPImagePlot_getCreateLUT(QList<int *> &lutstore, JKQTPMathImageColorPalette palette);
-/*! \brief frees a list of LUTs
-    \ingroup jkqtplotter_imagelots_tools
-    \internal
-    */
-void JKQTCOMMON_LIB_EXPORT JKQTPImagePlot_freeLUTs(QList<int *> &lutstore);
-
-
-/*! \brief convert a 2D image (as 1D array) into a QImage with given palette (see JKQTFPColorPalette)
-    \ingroup jkqtplotter_imagelots_tools
-
-    This method uses lookup tables which are saved as static variables to convert the 2D array into
-    an image. The luts are only created once, and stored then, so mor CPU time is saved. The precompiler define
-    JKQTPImageTools::LUTSIZE sets the size of the LUTs. Note that if you don't use a specific color palette,
-    the according LUT won't be calculated and stored!
-
-    \param dbl_in pointer to a 1D array of template type \c T representing the image to plot. This array has to be of size \a width * \a height
-    \param width width of the array in \a dbl
-    \param height height of the array in \a dbl
-    \param[out] img the QImage object to draw to (should be initialized as \c QImage::Format_ARGB32 )
-    \param palette the color palette to use for the display
-    \param minColor lower boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
-    \param maxColor upper boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
-    \param paletteMinFail specifies what shell happen, when a value in \a dbl is below \a minColor
-    \param paletteMaxFail specifies what shell happen, when a value in \a dbl is above \a maxColor
-    \param minFailColor color to use for pixels that are below \a minColor for some settings of \a paletteMinFail
-    \param maxFailColor color to use for pixels that are below \a maxColor for some settings of \a paletteMaxFail
-    \param nanColor color to use for pixels that are not-a-number
-    \param infColor color to use for pixels that are infinity
-    \param logScale create a log-scaled image
-    \param logBase base for the logarithm used when \c logScale==true
-    \param lutUser user define LUT
-    \param lutUserSize size of the LUT in lutUser
-*/
-template <class T>
-inline void JKQTPImagePlot_array2image(const T* dbl_in, int width, int height, QImage &img, JKQTPMathImageColorPalette palette, double minColor, double maxColor, JKQTPMathImageColorRangeFailAction paletteMinFail=JKQTPMathImageLastPaletteColor, JKQTPMathImageColorRangeFailAction paletteMaxFail=JKQTPMathImageLastPaletteColor, QColor minFailColor=QColor("black"), QColor maxFailColor=QColor("black"), QColor nanColor=QColor("black"), QColor infColor=QColor("black"), bool logScale=false, double logBase=10.0, const int* lutUser=0, int lutUserSize=0)
-{    
-    if (!dbl_in || width<=0 || height<=0)
-            return;
-
-    double min = *dbl_in;
-    double max = *dbl_in;
-    if (minColor == maxColor) {
-        bool first=true;
-        for (int i=1; i<width*height; ++i)
-        {
-            T v=dbl_in[i];
-            if (!(std::isnan(static_cast<long double>(v)) || std::isinf(static_cast<long double>(v)))) {
-                if (first) {
-                    min=max=v;
-                    first=false;
-                } else {
-                    if (v < min)
-                        min = v;
-                    else if (v > max)
-                        max = v;
-                }
-            }
-        }
-
-    } else {
-        min = minColor;
-        max = maxColor;
-    }
-
-    const T* dbl=dbl_in;
-    T* dbl1=nullptr;
-    if (logScale) {
-        double logB=log10(logBase);
-        dbl1=(T*)malloc(width*height*sizeof(T));
-        //memcpy(dbl, dbl_in, width*height*sizeof(T));
-        for (int i=0; i<width*height; i++) {
-            dbl1[i]=log10(dbl_in[i])/logB;
-        }
-        dbl=dbl1;
-        min=log10(min)/logB;
-        max=log10(max)/logB;
-    }
-    double delta=max-min;
-
-
-    const int* lut_used=nullptr;
-    int lutSize=JKQTPImageTools::LUTSIZE;
-    if (JKQTPImageTools::global_jkqtpimagetools_lutstore.size()<=0) JKQTPImageTools::global_jkqtpimagetools_lutstore =JKQTPImagePlot_makeQList<int*>(nullptr, JKQTPImagePlot_getPredefinedPalettes().size()+2);
-
-
-    img = QImage(width, height, QImage::Format_ARGB32);
-    if (min == max)
-            img.fill(0);
-    else
-    {
-
-        if (palette==JKQTPMathImageUSER_PALETTE) {
-            lut_used=lutUser;
-            lutSize=lutUserSize;
-            //qDebug()<<"user palette "<<lutUser<<lutUserSize;
-        } else {
-            lut_used=JKQTPImagePlot_getCreateLUT(JKQTPImageTools::global_jkqtpimagetools_lutstore, palette);
-        }
-
-
-        if (lut_used!=nullptr && lutSize>0) {
-            const unsigned int* lut_usedui=reinterpret_cast<const unsigned int*>(lut_used);
-            // LUT found: collor the image accordingly
-            for (int j=0; j<height; ++j) {
-                QRgb* line=reinterpret_cast<QRgb*>(img.scanLine(height-1-j));
-                for (int i=0; i<width; ++i) {
-                    double val=dbl[j*width+i];
-                    if (std::isnan(val)) {
-                        line[i]=nanColor.rgba();
-                    } else if (std::isinf(val)) {
-                        line[i]=infColor.rgba();
-                    } else {
-                        const int v = static_cast<int>((val-min)/delta*static_cast<double>(lutSize));
-                        const int vv = (v < 0) ? 0 : ( (v > lutSize) ? (lutSize) : v);
-                        line[i]=lut_usedui[vv];
-                        if ((v<0)&&(paletteMinFail==JKQTPMathImageGivenColor)) {
-                            line[i]=minFailColor.rgba();
-                        } else if ((v>lutSize)&&(paletteMaxFail==JKQTPMathImageGivenColor)) {
-                            line[i]=maxFailColor.rgba();
-                        } else if ((v<0)&&(paletteMinFail==JKQTPMathImageTransparent)) {
-                            line[i]=QColor(Qt::transparent).rgba();
-                        } else if ((v>lutSize)&&(paletteMaxFail==JKQTPMathImageTransparent)) {
-                            line[i]=QColor(Qt::transparent).rgba();
-                        }
-                    }
-                }
-            }
-        } else {
-            // no LUT found: paint a black image!
-            img.fill(0);
-        }
-    }
-
-    if (dbl1) free(dbl1);
-
 };
 
-/*! \brief convert a 2D image (as 1D array) into a QImage with given palette (see JKQTFPColorPalette)
+/*! \brief build an interpolated palette with \a lut_size entries from the linear segments defined for the color channels R, G and B in \a itemsR, \a itemG and \a itemB respectively
-    \ingroup jkqtplotter_imagelots_tools
+           \b NOTE: The entries in \a itemsR, \a itemsG, \a itemsB are assumed to be sorted by the position entry.
+    \ingroup jkqtplotter_imagelots_tools_LUTS
 
-    This method uses lookup tables which are saved as static variables to convert the 2D array into
-    an image. The luts are only created once, and stored then, so mor CPU time is saved. The precompiler define
-    JKQTPImageTools::LUTSIZE sets the size of the LUTs. Note that if you don't use a specific color palette,
-    the according LUT won't be calculated and stored!
 
-    \param dbl_in pointer to a 1D array of template type \c T representing the image to plot. This array has to be of size \a width * \a height
+
-    \param width width of the array in \a dbl
+
-    \param height height of the array in \a dbl
+    This is used to build a table of linear segments as a \c QList<JKQTPColorPaletteSingleColorLinSegment> :
-    \param[out] img the QImage object to draw to (should be initialized as \c QImage::Format_ARGB32 )
+    \verbatim
-    \param lutUser user-defined lookup-table
+      i    position    colval1            colval2
-    \param lutUserSize number of entries in \a lutUser
+     ~~~  ~~~~~~~~~~  ~~~~~~~~~~~~~~~~~  ~~~~~~~~~~~~~~~~~~
-    \param minColor lower boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
+      0       0.0           0 (IGNORED)        0
-    \param maxColor upper boundary of color range in \a dbl pixels, if \a minColor == \a maxColor then this function will extract the image min and image max.
+      1       0.5         100                100
-    \param paletteMinFail specifies what shell happen, when a value in \a dbl is below \a minColor
+      2       0.8         255                255
-    \param paletteMaxFail specifies what shell happen, when a value in \a dbl is above \a maxColor
+      3       1.0         255                255 (IGNORED)
-    \param minFailColor color to use for pixels that are below \a minColor for some settings of \a paletteMinFail
+    \endverbatim
-    \param maxFailColor color to use for pixels that are below \a maxColor for some settings of \a paletteMaxFail
+
-    \param nanColor color to use for pixels that are not-a-number
+    This will build a graph:
-    \param infColor color to use for pixels that are infinity
+    \verbatim
-    \param logScale create a log-scaled image
+       colval
-    \param logBase base for the logarithm used when \c logScale==true
+         ^
+         |
+    250  -                                        #**********#
+         |                                     ***
+    200  -                                  ***
+         |                               ***
+    150  -                             **
+         |                           **
+    100  -                     *****#
+         |                 ****
+     50  -            *****
+         |       *****
+      0  - #*****
+         |
+        ---|----|----|----|----|----|----|----|----|----|----|--> position
+          0.0  0.1  0.2  0.3  0.4  0.5  0.6  0.7  0.8  0.9  1.0
+    \endverbatim
+
+    You can also build graphs with a jump at a certain position
+    \verbatim
+      i    position    colval1            colval2
+     ~~~  ~~~~~~~~~~  ~~~~~~~~~~~~~~~~~  ~~~~~~~~~~~~~~~~~~
+      0       0.0           0 (IGNORED)        0
+      1       0.5         100                  0
+      2       1.0         255                255 (IGNORED)
+    \endverbatim
+
+    This results in:
+
+    \verbatim
+       colval
+         ^
+         |
+    250  -                                                 **#
+         |                                               **
+    200  -                                             **
+         |                                           **
+    150  -                                        ***
+         |                                      **
+    100  -                          #         **
+         |                    ******        **
+     50  -              ******            **
+         |        ******                **
+      0  - #******                   #**
+         |
+        ---|----|----|----|----|----|----|----|----|----|----|--> position
+          0.0  0.1  0.2  0.3  0.4  0.5  0.6  0.7  0.8  0.9  1.0
+    \endverbatim
+
+    \see JKQTPBuildColorPaletteLUTLinSegments(), \ref JKQTPlotterImagePlotUserPalette , https://matplotlib.org/api/_as_gen/matplotlib.colors.LinearSegmentedColormap.html#matplotlib.colors.LinearSegmentedColormap
 */
-template <class T>
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUTLinSegmentsSorted(const QList<JKQTPColorPaletteSingleColorLinSegment>& itemsR, const QList<JKQTPColorPaletteSingleColorLinSegment>& itemsG, const QList<JKQTPColorPaletteSingleColorLinSegment>& itemsB, int lut_size=JKQTPImageTools::LUTSIZE);
-inline void JKQTPImagePlot_array2image(const T* dbl_in, int width, int height, QImage &img, const int* lutUser, int lutUserSize, double minColor, double maxColor, JKQTPMathImageColorRangeFailAction paletteMinFail=JKQTPMathImageLastPaletteColor, JKQTPMathImageColorRangeFailAction paletteMaxFail=JKQTPMathImageLastPaletteColor, QColor minFailColor=QColor("black"), QColor maxFailColor=QColor("black"), QColor nanColor=QColor("black"), QColor infColor=QColor("black"), bool logScale=false, double logBase=10.0)
+
-{
+
-    JKQTPImagePlot_array2image(dbl_in,  width,  height, img,  JKQTPMathImageUSER_PALETTE, minColor, maxColor,  paletteMinFail,  paletteMaxFail,  minFailColor,  maxFailColor,  nanColor,  infColor,  logScale,  logBase, lutUser, lutUserSize);
+
-}
+/*! \brief build a linearly interpolated palette (as a look-up table) with \a lut_size entries by linearly interpolating between the nodes in \a items .
+           \b NOTE: \a items is assumed to be sorted by the first component of the \c QPair<double,QRgb> entries!
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+    The LUT is built following these rules:
+      - the final LUT has \a lut_size entries
+      - the first color in the lut is given by \c items.first().second
+      - the last color in the lut is given by \c items.last().second
+      - in between the colors are interpolated between the nodes in \a items and the color-nodes are
+        distributed according to the first component of the \c QPair<double,QRgb> entries:<br>
+        \image html JKQTPBuildColorPaletteLUTLinInterpolateSorted.png
+    .
+
+    \see JKQTPBuildColorPaletteLUTLinInterpolate(), \ref JKQTPlotterImagePlotUserPalette
+
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUTLinInterpolateSorted(const QList<QPair<double, QRgb> >& items, int lut_size=JKQTPImageTools::LUTSIZE);
+
+
+/*! \brief build a palette (as a look-up table) with \a lut_size entries that step between the nodes provided in \a items.
+           \b NOTE: \a items is assumed to be sorted by the first component of the \c QPair<double,QRgb> entries!
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+    The LUT is built following these rules:
+      - the final LUT has \a lut_size entries
+      - the first color in the lut is given by \c items.first().second
+      - the last color in the lut is given by \c items.last().second
+      - in between the colors are stepped between the nodes in \a items and the color-nodes are
+        distributed according to the first component of the \c QPair<double,QRgb> entries:<br>
+        \image html JKQTPBuildColorPaletteLUTSorted.png
+    .
+
+    \see JKQTPBuildColorPaletteLUT(), \ref JKQTPlotterImagePlotUserPalette
+
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUTSorted(const QList<QPair<double, QRgb> >& items, int lut_size=JKQTPImageTools::LUTSIZE);
+
+/*! \brief like JKQTPBuildColorPaletteLUTLinInterpolateSorted(), but sorts \a items before processing it!
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+    \copydetails JKQTPBuildColorPaletteLUTLinInterpolateSorted()
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUTLinInterpolate(QList<QPair<double, QRgb> > items, int lut_size=JKQTPImageTools::LUTSIZE);
+
+
+/*! \brief like JKQTPBuildColorPaletteLUTSorted(), but sorts \a items before processing it!
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+    \copydetails JKQTPBuildColorPaletteLUTSorted()
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUT(QList<QPair<double, QRgb> > items, int lut_size=JKQTPImageTools::LUTSIZE);
+
+/*! \brief like JKQTPBuildColorPaletteLUTLinSegmentsSorted(), but sorts \a itemsR, \a itemB, \a itemsG before processing them!
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+    \copydetails JKQTPBuildColorPaletteLUTLinSegmentsSorted()
+
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUTLinSegments(QList<JKQTPColorPaletteSingleColorLinSegment> itemsR,  QList<JKQTPColorPaletteSingleColorLinSegment> itemsG,  QList<JKQTPColorPaletteSingleColorLinSegment> itemsB, int lut_size=JKQTPImageTools::LUTSIZE);
+
+
+/*! \brief like JKQTPBuildColorPaletteLUTLinInterpolateSorted(), but accepts a \c QMap<double,QRgb> as parameter instead of \c QList<QPair<double,QRgb>>
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+    \copydetails JKQTPBuildColorPaletteLUTLinInterpolateSorted()
+
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUTLinInterpolate(const QMap<double, QRgb>& items, int lut_size=JKQTPImageTools::LUTSIZE);
+
+
+/*! \brief like JKQTPBuildColorPaletteLUTSorted(), but accepts a \c QMap<double,QRgb> as parameter instead of \c QList<QPair<double,QRgb>>
+    \ingroup jkqtplotter_imagelots_tools_LUTS
+
+     \copydetails JKQTPBuildColorPaletteLUTSorted()
+*/
+JKQTPImageTools::LUTType JKQTCOMMON_LIB_EXPORT JKQTPBuildColorPaletteLUT(const QMap<double, QRgb>& items, int lut_size=JKQTPImageTools::LUTSIZE);
 
 
 
 
 
-/*! \brief generates a QImage with width \a width and height 1 for the i-th color palette (\a i is based on the list returned by JKQTPImagePlot_getPredefinedPalettes() )
-    \ingroup jkqtplotter_imagelots_tools */
-QImage JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteImage(int i, int width);
-/*! \brief generates a QImage with width \a width and height \a height for the i-th color palette (\a i is based on the list returned by JKQTPImagePlot_getPredefinedPalettes() )
-    \ingroup jkqtplotter_imagelots_tools */
-QImage JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteImage(int i, int width, int height);
-/*! \brief generates a QImage with width \a width and height 1 for a specific JKQTPMathImageColorPalette
-    \ingroup jkqtplotter_imagelots_tools */
-QImage JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteImage(JKQTPMathImageColorPalette palette, int width);
-/*! \brief generates a QImage with width \a width and height \a height for a specific JKQTPMathImageColorPalette
-    \ingroup jkqtplotter_imagelots_tools */
-QImage JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteImage(JKQTPMathImageColorPalette palette, int width, int height);
-/*! \brief generates a QImage with width \a width and height 1 for a lookup-table \a lut with \a lut_size entries
-    \ingroup jkqtplotter_imagelots_tools */
-QImage JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteImage(int* lut, int lut_size, int width);
-/*! \brief generates a QImage with width \a width and height \a height for a lookup-table \a lut with \a lut_size entries
-    \ingroup jkqtplotter_imagelots_tools */
-QImage JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetAlphaPaletteImage(int* lut, int lut_size, int width, int height);
-
-/*! \brief generates a QIcon for the i-th color palette (\a i is based on the list returned by JKQTPImagePlot_getPredefinedPalettes() )
-    \ingroup jkqtplotter_imagelots_tools */
-QIcon JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteIcon(int i) ;
-
-
-/*! \brief generates a QIcon for a specific JKQTPMathImageColorPalette
-    \ingroup jkqtplotter_imagelots_tools */
-QIcon JKQTCOMMON_LIB_EXPORT JKQTPMathImageGetPaletteIcon(JKQTPMathImageColorPalette palette) ;
 
 
 

lib/jkqtplotter/graphs/jkqtpimage.cpp

@@ -1225,7 +1225,7 @@ QImage JKQTPMathImage::drawOutsidePalette(uint8_t steps)
     }
 
     QImage b(h,200, QImage::Format_ARGB32);
-    JKQTPImagePlot_array2image<double>(d,h,steps, b, palette, 0, steps-1);
+    JKQTPImageTools::array2image<double>(d,h,steps, b, palette, 0, steps-1);
     //b.save("c:/temp/b1.png");
     if (modifierMode!=ModifyNone) {
         modifyImage(b, dd, DoubleArray, h,steps, 0, h-1);
@@ -1265,7 +1265,7 @@ void JKQTPMathImage::drawKeyMarker(JKQTPEnhancedPainter &painter, QRectF &rect)
 }
 
 QStringList JKQTPMathImage::getPalettes()  {
-    return JKQTPImagePlot_getPredefinedPalettes();
+    return JKQTPImageTools::getPredefinedPalettes();
 }
 
 int JKQTPMathImage::getPalettesCount()
@@ -1297,7 +1297,7 @@ QImage JKQTPMathImage::getPaletteImage(int i, int width, int height)
     for (int j=0; j<width; j++) {
         pic[j]=j;
     }
-    JKQTPImagePlot_array2image<double>(pic, width, qMax(1,height), img, (JKQTPMathImageColorPalette)i, 0, width-1);
+    JKQTPImageTools::array2image<double>(pic, width, qMax(1,height), img, static_cast<JKQTPMathImageColorPalette>(i), 0, width-1);
     free(pic);
     return img;
 }
@@ -1346,7 +1346,7 @@ QImage JKQTPMathImage::getPaletteKeyImage(int i, int width, int height)
         pic[j]=exp(-0.5*(double((x-x01)*double(x-x01))/w1x+double((y-y01)*double(y-y01))/w1y))+0.7*exp(-0.5*(double((x-x02)*double(x-x02))/w2x+double((y-y02)*double(y-y02))/w2y));
         if (pic[j]>mmax) mmax=pic[j];
     }
-    JKQTPImagePlot_array2image<double>(pic, width, height, img, (JKQTPMathImageColorPalette)i, 0, mmax);
+    JKQTPImageTools::array2image<double>(pic, width, height, img, static_cast<JKQTPMathImageColorPalette>(i), 0, mmax);
     free(pic);
     return img;
 }
@@ -1616,16 +1616,16 @@ QImage JKQTPMathImage::drawImage() {
     QImage img(Nx, Ny, QImage::Format_ARGB32);
     getDataMinMax(internalDataMin, internalDataMax);
     switch(datatype) {
-        case JKQTPMathImageBase::DoubleArray: JKQTPImagePlot_array2image<double>(static_cast<double*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::DoubleArray: JKQTPImageTools::array2image<double>(static_cast<double*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::FloatArray: JKQTPImagePlot_array2image<float>(static_cast<float*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::FloatArray: JKQTPImageTools::array2image<float>(static_cast<float*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::UInt8Array: JKQTPImagePlot_array2image<uint8_t>(static_cast<uint8_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::UInt8Array: JKQTPImageTools::array2image<uint8_t>(static_cast<uint8_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::UInt16Array: JKQTPImagePlot_array2image<uint16_t>(static_cast<uint16_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::UInt16Array: JKQTPImageTools::array2image<uint16_t>(static_cast<uint16_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::UInt32Array: JKQTPImagePlot_array2image<uint32_t>(static_cast<uint32_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::UInt32Array: JKQTPImageTools::array2image<uint32_t>(static_cast<uint32_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::UInt64Array: JKQTPImagePlot_array2image<uint64_t>(static_cast<uint64_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::UInt64Array: JKQTPImageTools::array2image<uint64_t>(static_cast<uint64_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::Int8Array: JKQTPImagePlot_array2image<int8_t>(static_cast<int8_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::Int8Array: JKQTPImageTools::array2image<int8_t>(static_cast<int8_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::Int16Array: JKQTPImagePlot_array2image<int16_t>(static_cast<int16_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::Int16Array: JKQTPImageTools::array2image<int16_t>(static_cast<int16_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::Int32Array: JKQTPImagePlot_array2image<int32_t>(static_cast<int32_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::Int32Array: JKQTPImageTools::array2image<int32_t>(static_cast<int32_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
-        case JKQTPMathImageBase::Int64Array: JKQTPImagePlot_array2image<int64_t>(static_cast<int64_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
+        case JKQTPMathImageBase::Int64Array: JKQTPImageTools::array2image<int64_t>(static_cast<int64_t*>(data), Nx, Ny, img, palette, internalDataMin, internalDataMax, rangeMinFailAction, rangeMaxFailAction, rangeMinFailColor, rangeMaxFailColor, nanColor, infColor); break;
     }
     modifyImage(img);
     return img;

lib/jkqtplotter/graphs/jkqtpimage.h

@@ -552,6 +552,8 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPMathImage: public JKQTPMathImageBase {
         /*! \copydoc palette */
         void setPalette(const JKQTPMathImageColorPalette & __value);
         /*! \copydoc palette */
+        void setPalette(int pal);
+        /*! \copydoc palette */
         JKQTPMathImageColorPalette getPalette() const;
         /*! \copydoc rangeMinFailAction */
         void setRangeMinFailAction(const JKQTPMathImageColorRangeFailAction & __value);
@@ -654,7 +656,7 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPMathImage: public JKQTPMathImageBase {
         /*! \copydoc modifierMax */
         double getModifierMax() const;
 
-        void setPalette(int pal);
+
 
         /*! \brief if the graph plots outside the actual plot field of view (e.g. color bars, scale bars, ...)
 

lib/jkqtplotter/graphs/jkqtpimagergb.cpp

@@ -290,15 +290,15 @@ void JKQTPRGBMathImage::drawOutside(JKQTPEnhancedPainter& painter, QRect /*leftS
             if (rgbMode==JKQTPRGBMathImageModeRGBMode) {
                 d.palette=JKQTPMathImageRED;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             } else if (rgbMode==JKQTPRGBMathImageModeCMYMode) {
                 d.palette=JKQTPMathImageINVERTED_CYANWHITE;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             } else if (rgbMode==JKQTPRGBMathImageModeHSVMode || rgbMode==JKQTPRGBMathImageModeHSLMode) {
                 d.palette=JKQTPMathImageHSV;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             }
 
             l<<d;
@@ -313,19 +313,19 @@ void JKQTPRGBMathImage::drawOutside(JKQTPEnhancedPainter& painter, QRect /*leftS
             d.colorBarRightAxis=colorBarRightAxisG;
             d.colorBarTopAxis=colorBarTopAxisG;
             d.name=imageNameG;
-            JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, 199);
+            JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, 199);
             if (rgbMode==JKQTPRGBMathImageModeRGBMode) {
                 d.palette=JKQTPMathImageGREEN;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             } else if (rgbMode==JKQTPRGBMathImageModeCMYMode) {
                 d.palette=JKQTPMathImageINVERTED_MAGENTAWHITE;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             } else if (rgbMode==JKQTPRGBMathImageModeHSVMode) {
                 d.palette=JKQTPMathImageGRAY;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                //JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
+                //JKQTPImageTools::JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
                 QRgb* line=reinterpret_cast<QRgb *>(d.paletteImage.scanLine(0));
                 for (int i=0; i<pd_size; i++) {
                     QColor c=QColor("red");
@@ -335,7 +335,7 @@ void JKQTPRGBMathImage::drawOutside(JKQTPEnhancedPainter& painter, QRect /*leftS
             } else if (rgbMode==JKQTPRGBMathImageModeHSLMode) {
                 d.palette=JKQTPMathImageGRAY;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                //JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
+                //JKQTPImageTools::JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
                 QRgb* line=reinterpret_cast<QRgb *>(d.paletteImage.scanLine(0));
                 for (int i=0; i<pd_size; i++) {
                     QColor c=QColor("red");
@@ -356,19 +356,19 @@ void JKQTPRGBMathImage::drawOutside(JKQTPEnhancedPainter& painter, QRect /*leftS
             d.colorBarRightAxis=colorBarRightAxisB;
             d.colorBarTopAxis=colorBarTopAxisB;
             d.name=imageNameB;
-            JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, 199);
+            JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, 199);
             if (rgbMode==JKQTPRGBMathImageModeRGBMode) {
                 d.palette=JKQTPMathImageBLUE;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             } else if (rgbMode==JKQTPRGBMathImageModeCMYMode) {
                 d.palette=JKQTPMathImageINVERTED_YELLOWWHITE;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
+                JKQTPImageTools::array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, d.palette, 0, pd_size-1);
             } else if (rgbMode==JKQTPRGBMathImageModeHSVMode) {
                 d.palette=JKQTPMathImageGRAY;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                //JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
+                //JKQTPImageTools::JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
                 QRgb* line=reinterpret_cast<QRgb *>(d.paletteImage.scanLine(0));
                 for (int i=0; i<pd_size; i++) {
                     QColor c=QColor("red");
@@ -378,7 +378,7 @@ void JKQTPRGBMathImage::drawOutside(JKQTPEnhancedPainter& painter, QRect /*leftS
             } else if (rgbMode==JKQTPRGBMathImageModeHSLMode) {
                 d.palette=JKQTPMathImageGRAY;
                 d.paletteImage=QImage(1, pd_size, QImage::Format_ARGB32);
-                //JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
+                //JKQTPImageTools::JKQTPImagePlot_array2image<uint8_t>(pd, 1, pd_size, d.paletteImage, l[li].palette, 0, pd_size-1);
                 QRgb* line=reinterpret_cast<QRgb *>(d.paletteImage.scanLine(0));
                 for (int i=0; i<pd_size; i++) {
                     QColor c=QColor("red");

lib/jkqtplotter/graphs/jkqtpscatter.cpp

@@ -509,7 +509,7 @@ void JKQTPXYParametrizedScatterGraph::drawKeyMarker(JKQTPEnhancedPainter &painte
         } else {
             QImage img;
             double colorval[]={0,1};
-            JKQTPImagePlot_array2image<double>(colorval, 2, 1, img, getPalette(), double(0.0), double(1.0));
+            JKQTPImageTools::array2image<double>(colorval, 2, 1, img, getPalette(), double(0.0), double(1.0));
             color1=img.pixel(0,0);
             color2=img.pixel(1,0);
         }
@@ -852,7 +852,7 @@ QColor JKQTPXYParametrizedScatterGraph::getLocalColor(int i) const
             colMin=intColMin;
             colMax=intColMax;
         }
-        JKQTPImagePlot_array2image(&colorval, 1, 1, img, palette, colMin, colMax);
+        JKQTPImageTools::array2image(&colorval, 1, 1, img, palette, colMin, colMax);
         return img.pixel(0,0);
     }
 

lib/jkqtplotter/gui/jkqtpcomboboxes.cpp

@@ -31,10 +31,10 @@ JKQTPMathImageColorPaletteComboBox::JKQTPMathImageColorPaletteComboBox(QWidget *
     QComboBox(parent)
 {
     setIconSize(QSize(JKQTPImageTools::PALETTE_ICON_WIDTH,16));
-    QStringList pal=JKQTPImagePlot_getPredefinedPalettes();
+    QStringList pal=JKQTPImageTools::getPredefinedPalettes();
     clear();
     for (int i=0; i<pal.size(); i++) {
-        addItem(JKQTPMathImageGetPaletteIcon(i), pal[i]);
+        addItem(JKQTPImageTools::GetPaletteIcon(i), pal[i]);
     }
     connect(this, SIGNAL(currentIndexChanged(int)), this, SLOT(intIndexChanged(int)));
 }

lib/jkqtplotter/jkqtpbaseplotterstyle.cpp

@@ -83,7 +83,7 @@ void JKQTBasePlotterStyle::loadSettings(const QSettings &settings, const QString
     defaultTextColor=jkqtp_String2QColor(settings.value(group+"text_default_color", jkqtp_QColor2String(defaultStyle.defaultTextColor)).toString());
     defaultFontSize=settings.value(group+"text_default_size", defaultStyle.defaultFontSize).toDouble();
     defaultFontName=settings.value(group+"text_default_font_name", defaultStyle.defaultFontName).toString();
-    defaultPalette=String2JKQTPMathImageColorPalette(settings.value(group+"graph_default_palette", JKQTPMathImageColorPalette2String(defaultStyle.defaultPalette)).toString());
+    defaultPalette=JKQTPImageTools::String2JKQTPMathImageColorPalette(settings.value(group+"graph_default_palette", JKQTPImageTools::JKQTPMathImageColorPalette2String(defaultStyle.defaultPalette)).toString());
     defaultGraphWidth=settings.value(group+"graph_default_linewidth", defaultStyle.debugRegionLineWidth).toDouble();
     defaultGraphSymbolSize=settings.value(group+"graph_default_symbolsize", defaultStyle.defaultGraphSymbolSize).toDouble();
     defaultGraphSymbolLineWidth=settings.value(group+"graph_default_symbol_linewidtht", defaultStyle.defaultGraphSymbolLineWidth).toDouble();
@@ -182,7 +182,7 @@ void JKQTBasePlotterStyle::saveSettings(QSettings &settings, const QString &grou
     settings.setValue(group+"graph_default_linewidth", defaultGraphWidth);
     settings.setValue(group+"graph_default_symbolsize", defaultGraphSymbolSize);
     settings.setValue(group+"graph_default_symbol_linewidtht", defaultGraphSymbolLineWidth);
-    settings.setValue(group+"graph_default_palette", JKQTPMathImageColorPalette2String(defaultPalette));
+    settings.setValue(group+"graph_default_palette", JKQTPImageTools::JKQTPMathImageColorPalette2String(defaultPalette));
     settings.setValue(group+"graph_default_fill_color_mode", JKQTPColorDerivationMode2String(graphFillColorDerivationMode));
     settings.setValue(group+"graph_default_error_color_mode", JKQTPColorDerivationMode2String(graphErrorColorDerivationMode));
     settings.setValue(group+"graph_default_error_fill_color_mode", JKQTPColorDerivationMode2String(graphErrorFillColorDerivationMode));

lib/jkqtplotter/jkqtpdatastorage.cpp

@@ -795,6 +795,20 @@ size_t JKQTPDatastore::addCalculatedColumn(size_t rows, const std::function<doub
     return addColumnForItem(itemid, 0, name);
 }
 
+////////////////////////////////////////////////////////////////////////////////////////////////
+size_t JKQTPDatastore::addCalculatedImageColumn(size_t cols, size_t rows, const std::function<double (size_t, size_t)> &f, const QString &name)
+{
+    size_t col=addImageColumn(cols, rows, name);
+    JKQTPColumn& colref = columns[col];
+    for (size_t y=0; y<rows; y++) {
+        for (size_t x=0; x<cols; x++) {
+            colref.setPixelValue(x, y, f(x,y));
+        }
+    }
+    return col;
+
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////
 size_t JKQTPDatastore::addColumnCalculatedFromColumn(size_t otherColumn, const std::function<double (double)> &f, const QString &name)
 {