Deprecate non-image ImageCms modes #8031
Merged
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Resolves #8007
https://pillow.readthedocs.io/en/stable/reference/ImageCms.html#PIL.ImageCms.buildTransform and https://pillow.readthedocs.io/en/stable/reference/ImageCms.html#PIL.ImageCms.buildProofTransform describe
inMode
andoutMode
asHowever, "RGBA;16B", "L;16", "L;16B", "YCCA" and "YCC" are modes that can be interpreted, and there is a default case if the mode is not recognised.
This deprecates modes that are not Pillow modes, and also deprecates the default value if the mode is not able to be mapped. I've also added I;16, I;16L, I;16B, YCbCr as possible replacement values.