[XeTeX] Outputing PDFs in CMYK ColorSpace

[Michiel Kamermans]

Since plugins for Acrobat don't do much on *nix (unless you're running 
things in wine, and let's not go there for production tool chains), you 
may want to consider learning ghostscript, which was specifically 
designed to manipulate postscript and pdf files - however, ghostscript 
is rather unfriendly to people who "just want to do ... or ...", you 
need to read the manual and become familiar with the too. It's a pretty 
challenging learning curve, but figure out how to properly use it and 
CMYK conversion should be a breeze.

- Mike "Pomax" Kamermans
nihongoresources.com