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imageio_tiff: support for 8/16bit tiff with CIELAB/ICCLAB photometric #1996
There are a lot of modules before colorin that implicitely assume RGB input. One of it is retouch and the wish to use this module for certain scanner images has been the starting point for the PR.
As a working space, linear RGB spaces like REC2020 are most secure due to the proximity with pure spectral primaries. If it's an achival space, ACES P0 is the best, Prophoto RGB works too.