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Allow writing IFDRational to UNDEFINED tag #7840

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merged 2 commits into from
Mar 11, 2024

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Resolves #7839. Similar to #6890

The issue provides an image where the InteropVersion tag has type RATIONAL.
https://exiftool.org/TagNames/EXIF.html states that it should have type UNDEFINED. The tag is loaded as RATIONALs, but this causes an error when Pillow tries to write it as UNDEFINED when saving the EXIF data.

This PR simply handles the IFDRational value when saving UNDEFINED tags.

@hugovk hugovk merged commit 4e92ee0 into python-pillow:main Mar 11, 2024
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@radarhere radarhere deleted the write_undefined branch March 12, 2024 00:45
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Successfully merging this pull request may close these issues.

exif_transpose raises TypeError: object of type 'IFDRational' has no len()
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