diff --git a/doc/images/palettes/palette_greenblue.png b/doc/images/palettes/palette_greenblue.png
index ad6465aeee..e621b72771 100644
Binary files a/doc/images/palettes/palette_greenblue.png and b/doc/images/palettes/palette_greenblue.png differ
diff --git a/doc/images/palettes/palette_stepsGnBl.png b/doc/images/palettes/palette_stepsGnBl.png
index 1322da117d..26034231e0 100644
Binary files a/doc/images/palettes/palette_stepsGnBl.png and b/doc/images/palettes/palette_stepsGnBl.png differ
diff --git a/lib/jkqtcommon/jkqtpbasicimagetools.cpp b/lib/jkqtcommon/jkqtpbasicimagetools.cpp
index e04277dd15..b3f99a4bc3 100644
--- a/lib/jkqtcommon/jkqtpbasicimagetools.cpp
+++ b/lib/jkqtcommon/jkqtpbasicimagetools.cpp
@@ -979,7 +979,7 @@ QMap<int, JKQTPImageTools::LUTData > JKQTPImageTools::getDefaultLUTs() {
         }
 
 
-        std::reverse(lst.begin(), lst.end());
+        lst.reverse();
 
 
         {
diff --git a/lib/jkqtcommon/jkqtpbasicimagetools.h b/lib/jkqtcommon/jkqtpbasicimagetools.h
index fa7ff17996..8b654c40b0 100644
--- a/lib/jkqtcommon/jkqtpbasicimagetools.h
+++ b/lib/jkqtcommon/jkqtpbasicimagetools.h
@@ -165,7 +165,6 @@ enum JKQTPMathImageColorPalette {
     JKQTPMathImageTol_STEP, /*!< \image html palettes/palette_Tol_step.png
                                   \note color-blind friendly!
                                   \see https://thenode.biologists.com/data-visualization-with-flying-colors/research/*/
-    JKQTPMathImageTolBright_STEP=JKQTPMathImageTol_STEP,
     JKQTPMathImageTolMuted_STEP, /*!< \image html palettes/palette_TolMuted_step.png
                                         \note color-blind friendly!
                                         \see from https://yoshke.org/blog/colorblind-friendly-diagrams and Tol, B. Points of view: Color blindness. Nat Methods 8, 441 (2011). https://doi.org/10.1038/nmeth.1618 */
@@ -217,7 +216,7 @@ enum JKQTPMathImageColorPalette {
                                      \see JKQTPCreateGreensCubeHelixLUT()
                                  */
     JKQTPMathImageMatlab_STEP, /*!< \image html palettes/palette_Matlab_step.png */
-    JKQTPMathImageMatlabLegacy_STEP, /*!< \image html palettes/palette_Matlab_step.png */
+    JKQTPMathImageMatlabLegacy_STEP, /*!< \image html palettes/palette_MatlabLegacy_step.png */
     JKQTPMathImageMatplotlib_STEP, /*!< \image html palettes/palette_Matplotlib_step.png */
     JKQTPMathImageSeaborn_STEP, /*!< \image html palettes/palette_Seaborn_step.png */
     JKQTPMathImageSeabornPastel_STEP, /*!< \image html palettes/palette_SeabornPastel_step.png */
@@ -1132,11 +1131,22 @@ public:
     inline void push_back(double pos, QColor color) {
         push_back(ListType::value_type(pos, color.rgb()));
     }
-    using ListType::operator<<;
     inline JKQTPPaletteList& operator<<(QColor color) {
         push_back(color);
         return *this;
     }
+    /** \brief reverse colors */
+    inline void reverse() {
+        const auto ma=getMaxPosition();
+        for (auto& c: *this) {
+            c.first=ma-c.first;
+        }
+        sort();
+    }
+    /** \brief sorty by position */
+    inline void sort() {
+        std::sort(begin(), end(), [](const parameter_type& a, const parameter_type& b) { return a.first<b.first;});
+    }
 
     /** \brief returns the minimum value of the double-component */
     inline double getMinPosition() const {
diff --git a/screenshots/mandelbrot.png b/screenshots/mandelbrot.png
index d857fcbcbb..1f5de189bd 100644
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diff --git a/screenshots/mandelbrot_small.png b/screenshots/mandelbrot_small.png
index f7e05ad4bf..0df80dc528 100644
Binary files a/screenshots/mandelbrot_small.png and b/screenshots/mandelbrot_small.png differ