https://bugzilla.wikimedia.org/show_bug.cgi?id=51298
Web browser: ---
Bug ID: 51298
Summary: Vips scalar scales greyscale pngs as RGB
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: VipsScaler
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Classification: Unclassified
Mobile Platform: ---
Copied from [[COM:VP]]
Unfortunately, there's a big problem with the thumbnailing of File:Shield of
Trinity Aveling 1891.png. The current 595px thumbnail is a rather optimized
16bit grayscale+alpha image 82kb in size, while the 595px thumbnail under the
new algorithm is a 32-bit RGB+alpha image 155 kb in size (or almost twice the
filesize). It took about 6 years to get grayscale PNGs to generate grayscale
thumbnails (one reason why some people still preferred GIFs for such images
until relatively recently: File:Harleian Ms2169 St Mihell arms tricked
original.gif etc.), and I would be quite disappointed to see such belated and
hard-won progress suddenly be reversed at this point... AnonMoos (talk) 18:20,
13 July 2013 (UTC)
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Note, we do store if a png file is RGBA or greyscale in img_metadata, so if we
can't fix vips on this point, we could perhaps have it fallback to the old
scaler for greyscale images.
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