ENH: add to_grayscale() method to color maps #3589
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This PR adds a method to the
Colormap
base class which computes and returns a grayscale version of the map. This helps to quickly preview how various colormaps will appear when printed in grayscale.This uses the same formula as photoshop's grayscale conversion; see http://alienryderflex.com/hsp.html for details.
As an example of the usage, we can quickly demonstrate one reason why everybody loves to rag on jet:
I'm open to any suggestions or comments! I'm not sure if there are any complications with corner cases that I might be overlooking...