[Webkit-unassigned] [Bug 19688] Add autodetection of image orientation from EXIF information

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu May 26 14:28:40 PDT 2011


https://bugs.webkit.org/show_bug.cgi?id=19688





--- Comment #64 from Robert O'Callahan <roc at ocallahan.org>  2011-05-26 14:28:39 PST ---
(In reply to comment #61)
> There are 3 types of possible breakage:
> 
> 1.  Images with height/width specified, which are now auto-rotated, and look squished.
> 2.  Images without height/width, which are now auto-rotated and cause other parts of the page to move (and possibly look wrong).
> 3.  Sites which use an existing client-side auto-rotate solution like: http://www.nihilogic.dk/labs/exif/ or http://byrev.org/bookmarks/wordpress-exif-orientation-plugin/which may now break.  (I know of no such site).

There's a fourth possibility:
4. Images with EXIF orientation that have been manually rotated to display correctly on the Web (or in a photo viewer that doesn't respect EXIF orientation, such as the Windows 7 built-in Photo Viewer), but the EXIF data was not updated (or was updated incorrectly) so now the EXIF orientation is incorrect.

(I just noticed that if you rotate the image in Windows Photo Viewer to have the correct orientation, it adds an EXIF tag with the correct orientation, but doesn't remove the original one! I wonder what kind of issues that triggers...)

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