About vectorization and planar channels in Krita

Sven Langkamp sven.langkamp at gmail.com
Thu Oct 25 17:34:44 UTC 2012

On Thu, Oct 25, 2012 at 7:28 PM, Boudewijn Rempt <boud at 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.
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