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List:       kde-kimageshop
Subject:    Re: koffice/krita/image/filter
From:       Cyrille Berger <cberger () cberger ! net>
Date:       2010-05-06 10:08:38
Message-ID: 201005061208.38461.cberger () cberger ! net
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On Thursday 06 May 2010, you wrote:
> Argh.. Gmail doesn't add the CC's when replying.
> 
> Btw, don't all the composites should be fixed then?

Well most composite ops don't touch the alpha channel. I would say OVER and 
ALPHA DARKEN are exceptional in that area.

> I think the composition should look like with two stages:
> 1) we blend two devices, not counting any selections and write in to the
> temporary device
> 2) then we blend the result into the destination device using the selection
> value as an alpha channel for temporary device. At this stage the original
> alpha channel of the temporary device will be dealt as a regular channel.
Sounds complicated :) and I don't really see the point.

And now that I think about it, we probably just need to use COMPOSITE_OVER 
with ALPHA channel locked.

-- 
Cyrille Berger
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