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List:       kde-kimageshop
Subject:    Re: About vectorization and planar channels in Krita
From:       Sven Langkamp <sven.langkamp () gmail ! com>
Date:       2012-10-25 17:34:44
Message-ID: CAAmsBf=U=Adb+Of0gmZS+aKqdJ2cKqCSLhscoRxQ6P=gaicSWw () mail ! gmail ! com
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On Thu, Oct 25, 2012 at 7:28 PM, Boudewijn Rempt <boud@valdyas.org> wrote:

> On Thursday 25 October 2012 Oct, Andre Gemuend wrote:
> > Hi Boudewijn,
> >
> > > The previous maintainer of Krita always intended to make Krita work
> with pre-multiplied alpha -- but I never really understood how to make that
> properly work given lots of independent layers. I don't think other open
> source graphics apps use pre-multiplied alpha either, but I'm not
> completely sure of that. Do you know of one?
> >
> > well, yes, Gimp for example, and Photoshop, as far as I know.
>
> I don't know about photoshop -- but from what I read from gimp code way
> back, it was also using a discrete alpha channel, as far as I could tell?


I guess Photoshop does that too. They can have colorspaces with more than
one alpha channel, so I think premultiplication doesn't make sense there.

[Attachment #5 (text/html)]

<div class="gmail_quote">On Thu, Oct 25, 2012 at 7:28 PM, Boudewijn Rempt <span \
dir="ltr">&lt;<a href="mailto:boud@valdyas.org" \
target="_blank">boud@valdyas.org</a>&gt;</span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> <div class="im">On Thursday 25 October 2012 Oct, Andre \
Gemuend wrote:<br> &gt; Hi Boudewijn,<br>
&gt;<br>
&gt; &gt; The previous maintainer of Krita always intended to make Krita work with \
pre-multiplied alpha -- but I never really understood how to make that properly work \
given lots of independent layers. I don&#39;t think other open source graphics apps \
use pre-multiplied alpha either, but I&#39;m not completely sure of that. Do you know \
of one?<br>

&gt;<br>
&gt; well, yes, Gimp for example, and Photoshop, as far as I know.<br>
<br>
</div>I don&#39;t know about photoshop -- but from what I read from gimp code way \
back, it was also using a discrete alpha channel, as far as I could \
tell?</blockquote><div><br></div><div>I guess Photoshop does that too. They can have \
colorspaces with more than one alpha channel, so I think premultiplication \
doesn&#39;t make sense there. </div> </div>



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