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