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RedBallColor Maps are a convenient indexing scheme in MATLAB. In my research I found that the standard colormaps are not enough, and I need to be able to create and change new colormaps "on the fly".

A long time ago, I wrote a user-friendly code that allows to create a custom colormap map. Program has a graphical user interface (see below).

my colormap

It displays the colors in the colorful spiral at the center of the figure. You can choose any color from the spiral and place it on the top bar with the number below. Numbers represent the row number of that particular color in the Matlab defined 64x3 color matrix.
Once you placed all desired colors (at least two), press the 'Process CM' button. Colors will be interpolated (or/and extrapolated) to create the continuous gamma. You can also edit (by all means) your colormap!

Since so many people have contacted me asking for the code, I put it here. You could use the code as is, but please honour the authorship.