https://bugzilla.wikimedia.org/show_bug.cgi?id=32507
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Bug #: 32507
Summary: EXIF orientation processing might lead to double
rotation
Product: MediaWiki
Version: 1.18
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Images and files
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Recently with Bug 6672 EXIF orientiation processing was added to MediaWiki. But
this has some harmful effects: there are examples where a JPEG image has
already been rotated losslessly without changing the EXIF orientation tag. This
leads to the effect, that the image gets rotated again when imported to
MediaWiki.
Here are two examples:
http://de.wikipedia.org/w/index.php?title=Datei:Pfaender.jpg&oldid=33252498
http://de.wikipedia.org/w/index.php?title=Sender_Regensburg-Ziegetsberg&oldid=96177510
One may argue that the EXIF orientation tag should not be processed by
wikimedia at all, because the problem has to be eliminated at the source:
people should losslessly rotate their pictures with appropriate tools before
even uploading them to the internet.
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