Save colormaps in more space-efficient form

[endolith]

I tried saving as float16 but the results were not identical, even though RGB is only 8-bit for each color. Need to identify why it wasn't the same and if it matters.

Maybe a sparse non-uniformly sampled representation that only stores important points and interpolates between them in flat areas?

[endolith]

then you could just include the table in the git repo, but wait til it's smaller so it doesn't waste space in the revision history