This is probably off topic, but Linux does seem to
have a
deficiency in 2d graphics (color processing stuff for pre-press).
I'd say it is off topic, unless you are creating CD artwork for litho
printing. You should check out the latest version of Scribus, which
has colour management support. Also I believe Gimp 2.0 has a CMYK
mode, although I haven't had a chance to explore that yet.
Ghostscript has pre-press features now, and there are a number of
software RIPs based on Linux. Caldera Graphics used to produce one.
I've been using Quark Xpress/Photoshop for about 9 years, but now that
PDF is an acceptable pre-press format I'd like to think that
Scribus/Gimp is a viable alternative.
Cheers
Daniel