CMYK colour format

[Lev Tarasoff <lev@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

I understand that ferret/Fprint outputs postscript colour files in RGB
format. However, AGU requires CMYK colour format for submission to
its print journals. How can I get CMYK format? 

thanks

Lev Tarasoff -  Dept of Physics, University of Toronto,
                60 St. George St., Toronto, Ontario, CANADA, M5S 1A7
                Tel (416)-946-3019  Fax (416)-978-8905
                email: lev@atmosp.physics.utoronto.ca