After experimenting with colormaps for a while, I was able to make both discrete (piecewise-constant) and continuous (piecewise-linear) colormaps work. Although colormaps can be created directly using LinearSegmentedColormap from the matplotlib.colors package, this is a tedious and error-prone process. So, I compiled a set of three interface functions. (I wrote two of these myself, and got one from the SciPy website). The two functions that I wrote permit one to define a discrete (piecewise-constant) and continuous (piecewise-linear) colormap directly via a sequence of colors and a set of thresholds specified as lists. Each color may be specified either via an RGB tuple or via an English color name known to webcolors.name_to_rgb. I'm submitting this in the hopes that this functionality will be incorporated into matplotlib. There's one thing that I've not been able to resolve: When attempting to display all defined colormaps using colormaps_test.py (attached), colormaps that I've defined do not show up. So, it would appear that registering a colormap makes it possible to access that colormap only if the name is known to the program that wants to use it. http://www.nabble.com/file/p25665294/make_cmap.py make_cmap.py http://www.nabble.com/file/p25665294/colormaps_test.py colormaps_test.py -- View this message in context: http://www.nabble.com/new-interface-functions-for-LinearSegmentedColormap-tp25665294p25665294.html Sent from the matplotlib - devel mailing list archive at Nabble.com.