[XeTeX] cmyk colour support broken?

William Adams will.adams at frycomm.com
Fri May 19 16:40:19 CEST 2006

I'm setting up a journal in XeTeX, but I'm not able to get process  
black type:

%!TEX TS-program = xelatex
\newcommand{\blacktype}[1]{\special{color push}\special{color cmyk 0  
0 0 1}#1\special{color pop}}
\newcommand{\graytype}[1]{\special{color push}\special{color gray 0}#1 
\special{color pop}}
\newcommand{\cyantype}[1]{\special{color push}\special{color cmyk 1 0  
0 0}#1\special{color pop}}
\blacktype{This should be process black, no cyan, magenta or yellow,  
but instead it has all of the above}

\graytype{This should be defined as gray, hence black only, but is a  
rich black as above}

\cyantype{This is cyan, no magenta, yellow or black}

The cmyk colour model works _if_ I include a cyan, magenta and/or  
yellow component, but fails when trying to make something which is  
only black.

Any idea why?


William Adams
senior graphic designer
Fry Communications

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