There was talk of deprecating colorsys, but PEP 594 now lists it under "modules to keep" so I don't see why we couldn't improve it. The OP's reasons for doing so seem solid. I don't know anything about this topic so I'll leave it at that.

On Fri, Nov 12, 2021 at 2:22 PM Terry Reedy <tjreedy@udel.edu> wrote:

https://github.com/python/cpython/pull/29512
adds what appears to be well written conversions between RGB and YUV
color systems, with tests. Are we allowing such improvements? If not,
a module docstring note or comment should be added.

--
Terry Jan Reedy

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