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List:       koffice-devel
Subject:    Re: The GIMP 2.0
From:       Thomas Zander <zander () kde ! org>
Date:       2004-01-14 9:53:30
Message-ID: 200401141053.35450.zander () kde ! org
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On Wednesday 14 January 2004 10:11, dirk.schoenberger@sz-online.de wrote:
> >>>From what I read in the core (gimp-devel 1.2), in the core RGB(A),
> >>
> >> grayscale and 8 bit indexed is supported. This can all be rendered in
> >> RGB(A).
> >>
> >> Other colour models like CMYK are more complicated, because the
> >> conversion
> >> between CMYK and RGB is not quite simple.
> >
> > The conversion (for printing) is straightforward arithmetic to get CMY,
> > then you get K
> > which is MIN(C,M,Y) which is subtracted from all three.  But this just
> > renders that
> > additive color model.
>
> I had the impression that the whole problem what that RGB <-> CMYK
> conversion was not so straight forward than I thought.
> I think the whole conversion algorithm contains some linear factors
> (like K = 0.1C + .098M+.965Y or somesuch) instead of a pure minimum value.
>
> But I don't have the exact formula handy, sorry.

Photoshop and others have always used conversion tables for the best result.
I have been wondering in what amount reverse engineering could be used to 
convert a lot of images in photoshop and come up with your own conversion 
table... If thats legal then I feel thats the first correct conversion table 
OSS has, which has been a very good reason for my company to keep buying 
photoshop in the last couple of years.

- -- 
Thomas Zander
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