Cool! I knew there had been some useful tools posted on the earlier thread
but didn't have time to dig them out.
Interesting observation about the colorfulness. I don't know enough about
all the transformations involved to full account for that, but I added some
stuff to the notebook to figure out how much of that might be caused by
straying out of gamut. It looks like the map I created does a pretty good
job and is only getting clamped at the very low end and near the high end,
so I don't think it's a complete explanation for the undulating
"colorfulness":
http://nbviewer.ipython.org/gist/mwaskom/6a43a3b94eca4a9e2e8b
By means of disclosure, I did this before having coffee, so it might be
wrong...
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