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List:       kde-kimageshop
Subject:    Re: Funny paint effect
From:       Boudewijn Rempt <boud () valdyas ! org>
Date:       2004-09-16 14:55:03
Message-ID: 200409161655.05851.boud () valdyas ! org
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On Thursday 16 September 2004 16:50, Boudewijn Rempt wrote:
> On Thursday 16 September 2004 10:43, Boudewijn Rempt wrote:
> > I'm not sure what's going on -- it must have something to do
> > with tile cobbling and compositing with an opacity < max, because
> > the same thing (of course) happens when painting with a transparent brush
> > or pen.
>
> I have a feeling it could have something to do with the background pattern
> 'shining through', which would mean that the alpha compositing code in rgb
> isn't completely dependable. I can see artefacts the size of the background
> checks.

Hm. The checks are indeed compositing artefacts -- saving a file that shows
the effect in Krita's native format saves the artefacts. The black regions
that show up when scaling down an image that is obscured by the ui are a 
rendering artefact, because saving a scaled-down image to a .kra and loading
it again shows a perfect image. It's as if some data isn't reached by the 
rendering stack.

-- 
Boudewijn Rempt | "Geef mij maar zuurtjes."
http://www.valdyas.org/fading/index.cgi

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