https://bugzilla.wikimedia.org/show_bug.cgi?id=66337
Bug ID: 66337
Summary: Scaling of images should take place in a linear colour
space
Product: MediaWiki
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: File management
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected]
Web browser: ---
Mobile Platform: ---
Dispenser mentioned to me that our image scaling is working on non-linear sRGB
colour space, which causes some less than ideal results on dark images
Background on issue:
* http://www.4p8.com/eric.brasseur/gamma.html [Specifically mentions Wikipedia
as doing it wrong]
* http://www.imagemagick.org/Usage/resize/#resize_colorspace
For image magick, it looks like this can be addressed by just adding some
command line flags (which flags unfortunately vary by version). [Except
possibly not jpeg as that's shrunk by libjpeg]
Its unclear if something similar can be done in vips well still using the very
efficient sequential read and not creating a giant temporary file. There is a
-a option to vipsthumbnail that could maybe be used.
(If it can only be on image magick and then not for jpeg, we possibly wouldn't
want to do it at all to keep things consistent. Requires more investigation
anyhow)
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