https://bugzilla.wikimedia.org/show_bug.cgi?id=18936
Summary: Colour-dependent positioning errors in SVG rasterisation
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Normal
Component: Images and files
AssignedTo: wikibugs-l@lists.wikimedia.org
ReportedBy: t_edwa...@btinternet.com
Three SVG files identical in every way but their colour have been rendered
differently:
http://en.wikipedia.org/wiki/File:Crowned_Portcullis.svg
http://en.wikipedia.org/wiki/File:Crowned_Portcullis_red.svg
http://en.wikipedia.org/wiki/File:Crowned_Portcullis_green.svg
The issue is along the centre of the image from top to bottom. The black image
has a barely-noticeable seam, and the red image has no seam at all, yet the
green image has a very noticeable seam all the way through. It may be helpful
to zoom in on the rasters to see what I'm talking about.
The left half of the image is mirrored to create the right half, which explains
but doesn't excuse the seam - the two halves actually *overlap* each other!
Given that the seam comes and goes depending on the size of the raster, I'd
tentatively put this down to rounding errors...
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