Prism colormap array
c = prism returns the prism colormap as a three-column array with the
same number of rows as the colormap for the current figure. If no figure exists,
then the number of rows is equal to the default length of 256. Each row in the array
contains the red, green, and blue intensities for a specific color. The intensities
are in the range [0,1], and the color scheme is a repeated sequence of the rainbow colors.
Downsample the Prism Colormap
Create a scatter plot with the default colors.
x = [3.5 3.3 5 6.1 4 2]; y = [14 5.7 12 6 8 9]; sz = 100*[6 100 20 3 15 20]; c = [1 2 3 4 5 6]; scatter(x,y,sz,c,'filled','MarkerEdgeColor','k','MarkerFaceAlpha',.5); xlim([1 7]); ylim([1 16]);
Get the prism colormap array with six entries. Then replace the colormap in the scatter plot.
c = prism(6); colormap(c);
Version HistoryIntroduced before R2006a
R2019b: Colormaps Have 256 Colors by Default
Behavior changed in R2019b
Starting in R2019b, colormaps have 256 colors by default.
In R2019a and previous releases, the default size is 64. If you have code that
depends on a colormap having 64 colors, specify the number of colors when you set
the colormap for the figure, axes, or chart. For example,
colormap(prism(64)) sets the figure's colormap to the
Alternatively, you can change the default colormap for all figures within your MATLAB® session: