With regard to the recent discussions about color_maps,  I was wondering if it
were possible to somehow extract the number, or even the values of the entries
in a color_map.

I know that we cannot do this directly, but I was wondering if there were
perhaps a method by which a function could be applied which would reveal the
locations of the "nodes".  Some discontinuity or eigenvector, or other clever
exploit.

Perhaps there's a way to look at some sort of plot of the rgb values and see
where the blending transitions from interpolating A into B  over to where it
switches into interpolating B into C....

I'm also wondering if there is a color_map that exceeds the valid 0-1 span, if
it were possible to access those invalid entries using the same sort of hacking
strategy.

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