I want to use the colormap
rainbow in an image using
imshow. It works perfectly, but I want to redefine the color for the value
0. Instead of violete, I want to use white.
I want to do this only for the value zero, all other values can stay with the default values in the colormap.
Any idea how to do this without having to edit the colormap manually?
You can also use
set_under which I think makes more semantic sense than using
my_cmap = matplotlib.cm.get_cmap('rainbow') my_cmap.set_under('w') imshow(np.arange(25).reshape(5, 5), interpolation='none', cmap=my_cmap, vmin=.001)
For an answer to a duplicate with more complete examples see How to create matplotlib colormap that treats one value specially?