Hi,

following problem: Let's say I have a couple of .png images that were
produced with imshow() and the jet() (==default) colormap. The original data
was 8 bit intensity data, now the images are 24 bit with false colors /
pseudocolors.
Now, is there a (simple?) way to calculate back from those 24 bit images to
the 8 bit intensity information? Of course this can only work with bijective
colormaps and if the colormap is well known; both is the case here.

Any ideas?

Thanks in advance, cheers

Thomas
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