https://bugzilla.wikimedia.org/show_bug.cgi?id=73602
Bug ID: 73602
Summary: Mirrored EXIF rotations are not applied to thumbnails
Product: MediaWiki
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: trivial
Priority: Unprioritized
Component: File management
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: gti...@wikimedia.org
CC: aarcos.w...@gmail.com, bawolff...@gmail.com,
bryan.tongm...@gmail.com, fflo...@wikimedia.org,
gti...@wikimedia.org, mtrac...@member.fsf.org
Blocks: 31504
Web browser: ---
Mobile Platform: ---
EXIF allows 8 possible values for the Orientation field: 0°, 90°, 180°, 270°,
and the same four for the mirror image of the original. The last four are not
used often, but are supported to some degree by the browsers. (See
http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/
for an overview of support.)
MediaWiki ignores mirrored rotations when generating thumbnails - the EXIF
information is stripped, and the physical orientation is left unchanged. See
[[commons:File:EXIF rotation 90 mirrored.jpg]] for an example (depending on the
browser, you might need to open the image directly to see the correct position,
or you might not see it at all - Chrome positions it correctly when viewed
directly but not when viewed on a page).
Obviously this is Priority: No One Cares but filing it anyway for the sake of
completeness.
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