[Matplotlib-users] applying an image's colormap to another image

[Matteo N. <ma...@my...>]

Can something like this (which by the way I can't get to work):
http://stackoverflow.com/questions/3114925/pil-convert-rgb-image-to-a-specific-8-bit-palette

What I would like to do is this:
1) Import an RGB image, which would have its own colormap - say this one
for example:
https://upload.wikimedia.org/wikipedia/commons/b/b3/Jupiter_new_hubble_view_above_pole.png

2) convert it to intensity, display the intensity color-mapped to the same
colours the original RGB had.

Any tips, or even better code or pseudocode would be greatly appreciated.

Thanks
Matteo