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[SVG 1.1] BackgroundImage and alpha compositing

From: MenTaLguY <mental@rydia.net>
Date: Tue, 26 Jun 2007 10:58:43 -0400
To: SVG List <www-svg@w3.org>
Cc: bulia byak <buliabyak@gmail.com>, Niko Kiirala <niko@kiirala.com>
Message-Id: <1182869923.18825.11.camel@localhost.localdomain>

I've run up against a problem with filters and the use of
BackgroundImage in SVG 1.1: the filter output is alpha-composited with
the background, which results in double-compositing if the filter itself
composites with the background (e.g. when using feBlend to get "blend
modes").  This is noticable in areas of the background which are
semi-transparent, which may be due to transparent objects, or simply

See here for an illustration of the problem:


Is there a way to work around this?  Ideally there would be some way for
filter output to replace part of the accumulated image rather than being
composited with it.


Received on Tuesday, 26 June 2007 14:59:12 UTC

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