Pie plots support the concept of color-themes. A color theme is simple a set of colors used for consecutive slices within the Pie. How to specify color-themes is further discussed in Specifying slice colors and using themes.

Matrix (Only available in the Pro-version) and contour plots also have the concept of color maps. This is a range of colors used to indicate the data in the plot. Examples of color maps can be found in Built in color maps. (Color maps are defined and implemented in "jpgraph_colormap.inc.php").