https://bugzilla.wikimedia.org/show_bug.cgi?id=46549
Web browser: ---
Bug ID: 46549
Summary: File size shrinks during rotation (action:
'imagerotate') // Rotation not lossless?
Product: MediaWiki
Version: 1.21-git
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: API
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
I don't know whether it is really a bug or just some
JPEG-encoding-internal-strangeness
Test at https://commons.wikimedia.org/wiki/File:Bot-Test.jpg
API query at:
https://commons.wikimedia.org/w/api.php?action=query&prop=info|imageinfo&iiprop=size|comment&titles=File:Bot-Test.jpg&iilimit=5
Start size: 324829; then, after first rotation 281901, then 275364, then 270655
and finally after 4 rotations just 268076 Bytes:
<ii size="268076" width="512" height="512" comment="Bild um 90 Grad im
Uhrzeigersinn gedreht" />
<ii size="270655" width="512" height="512" comment="Bild um 270 Grad im
Uhrzeigersinn gedreht" />
<ii size="275364" width="512" height="512" comment="Bild um 270 Grad im
Uhrzeigersinn gedreht" />
<ii size="281901" width="512" height="512" comment="Bild um 90 Grad im
Uhrzeigersinn gedreht" />
<ii size="324829" width="512" height="512" comment="Reverted to version as of
18:08, 29 November 2012" />
Expected result: After 360° rotation and if the image is not cropped, the file
size is supposed to be the same.
Why isn't simply the Metadata of the file manipulated (the
EXIF-Orientation-tag). The image-scalers would do the remaining work.
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