Fix saving of non-RGB thumbnails as PNG #17736
Merged
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The PNG format does not support non-RGB color spaces, which makes pillow raise an exception when trying to save e.g. a CMYK image in PNG format.
Converting to RGB is recommended on the upstream issue, and as CMYK is a print format transparency does not need to be considered.
Closes: #10741
Pull Request Checklist
EventStore
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