[texhax] cmyk colors are auto changed!

[Gordon Haverland]

On April 17, 2011, Steve Schwartz wrote:
> On Sun, 2011-04-17 at 15:23 +0100, Steven Woody wrote:
> > I found if I define a color in cmyk mode, the resulted color
> > with pdlatex will be anther one when I measure it with a
> > screen color picker. For example, the cmyk (1,0,0,0) will
> > become (1,0.27,0,0.07). On the other hand, if I define
> > colors in rgb mode, the result colors will be exactly same
> > as what I defined.
> 
> I am not a colour scheme expert

Does this help.  The Refracted Light Blog has a thread on 
Imaginary and Impossible Colors, and in there, they have:

Here are the most commonly used color systems:
sRGB:  35% of entire gamut
ColorMatch RGB: a bit larger than sRGB, slightly different 
primaries
Adobe RGB:  50.6%
Wide-Gamut RGB:  77.6%
CMYK: smaller than sRGB, but not complete overlap.
ProPhoto RGB: most of the visible color gamut, 13% of the colors 
are imaginary or impossible.
L*a*b colorspace: 100% of visible colors, with lots of impossible 
colors.
Anyway, there is more there to read.  It probably doesn't anwer 
all questions, but it might give you ideas as to what else to look 
at.

http://therefractedlight.blogspot.com/2010/09/imaginary-and-
impossible-colors.html

Gord
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