https://bugzilla.wikimedia.org/show_bug.cgi?id=42090
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Bug #: 42090
Summary: Filter effect Gaussian blur filter not rendered
correctly for small to medium thumbnail sizes
Product: Wikimedia
Version: wmf-deployment
Platform: All
OS/Version: All
Status: UNCONFIRMED
Severity: major
Priority: Unprioritized
Component: SVG rendering
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Mobile Platform: ---
The filter effect <feGaussianBlur> available in SVG specification
(http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement) is often (or
rather most of the time) not rendered correctly on all Wikimedia projects.
This is a known problem of librsvg (see
https://bugzilla.gnome.org/show_bug.cgi?id=605875) but probably won't get fixed
in the near future.
For some quite impressive examples refer to:
-
http://de.wikipedia.org/wiki/Wikipedia:Probleme_mit_SVGs#Ein_verkleinertes_Vorschaubild_sieht_ganz_anders_aus_als_das_Originalbild
-
http://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/VirtualDub_Logo.svg/195px-VirtualDub_Logo.svg.png
vs.
http://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/VirtualDub_Logo.svg/196px-VirtualDub_Logo.svg.png
-
http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Audacity_Logo.svg/127px-Audacity_Logo.svg.png
vs
http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Audacity_Logo.svg/128px-Audacity_Logo.svg.png
This bug severely restricts the possibilities of graphic artist on Wikimedia
projects since it basically renders the Gaussian blur filter completely useless
since the final rendering of the MediaWiki software is rather arbitrary and
comes near to gambling in the end. However Gaussian blurring is heavily used in
modern SVG images since it allows to create outstanding effects like 3D effects
and superior shading.
Besides art created exclusively for Wikimedia projects, many free SVG images
from other sources can't be used either since they are just not compatible,
would need a lot of work to render correctly at all and wouldn't look nice in
the end anyway.
Therefore it would be badly needed to either change the SVG renderer (maybe
only for problematic SVG files?) or to finally fix the bug in librsvg (maybe
consider
http://strategy.wikimedia.org/wiki/Proposal:librsvg_development_funding ?)
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