[argyllcms] Re: Conversion omitting/locking device colorant

FYI, this is how the G7 specification reasons about grey reaching dark regions:

5.3.1 G7 Gray Balance at 300% CMY
For convenience, gray balance triplets above 75% converge to
C=M=Y=100% with a theoretical color of 0 a* and 0 b*. There are
several logical reasons for this;
- In practice a 300% CMY patch (100C, 100M, 100Y) can be virtually any
color, therefore 0 a*, 0 b* is probably a fair average color
- A terminus of equal CMY values totaling 300% is mathematically convenient
- CMY values over 75% in neutrals are uncommon
- The color of darker CMY triplets is hidden by black ink in most CMYK images.

http://www.idealliance.org/g7global/specification/G7_Spec2008.pdf

Martin Weberg

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