[argyllcms] Re: Device link gamut mapping: how to do it right?

Graeme Gill wrote:

The gamut mapping for a source gamut is a little complex, and I'd have
to look back over my notes and the source code to recall all the details.
Basically it is still a mapping from the source color space to destination
color space, and (I think) the neutral axis matching (which includes the white
point) is determined just by this. The extent of compression is
essentially what is affected by the the source image gamut.
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As I understood, the -G"image.gam" mapping in collink is equivalent to simple 
mode (-s -ip -op), except additional compression changes based on gamut 
overlaps. So, it's some equivalent to standard perceptual mapping.
You say, that there is the "the neutral axis matching (which includes the white
point)" so, it's contain a kind of relative linking. It seems to me, that there 
is relative scaling before compression from input profile to output in collink 
-G. Is there relative scaling of "image.gam" in collink before compression too?
I can't belive, that there is -ia intent necessary instead of -ir in tiffgamut 
preceding collink -G.
I've experimented a bit, and noticed, that while tiffgamut -ir there is less 
clipped areas in output images, than wile tiffgamut -ia before collink -G 
linking.

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