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Yes and no. There is basic functionality for colormaps, as described on the question about coloring by z-level. Sage's colormaps come from matplotlib, and you can define your own colormap functions in matplotlib. Here is the documentation for matplotlib colormaps.

But I don't know if Sage's interface to matplotlib has been extended to all the functionality of matplotlib (probably not). Perhaps you'll need to import matplotlib and use it's plotting functionality directly . . .

It should be possible, but may require learning more about matplotlib and how to use it. Good luck!