CMYK saving requires OpenJPEG 2.5.3#1
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CTimmerman merged 1 commit intoCTimmerman:mainfrom Mar 1, 2026
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Suggestion for python-pillow#9447
macOS is using OpenJPEG 2.5.4, while Ubuntu is using OpenJPEG 2.5.0.
https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#jpeg-2000
So it's not about the platform itself, but rather about the OpenJPEG version.