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John, The GEMPAK ps device driver is configured to write out the RGB colors as are the $GEMTBL/colors tables. The postscript command for CMYK is "setcmykcolor"- analogous to the setrgbcolor but with the 4 stack values. The DeviceCMYK command is used to set the returned color values to the CMYK space. Steve Chiswell Unidata User Support On Tue, 11 Dec 2001, John Hobbie wrote: > How do you change the color format from RGB to CYMK in > postscript? Is this a simple table fix, or is it imbedded in the driver > source code? > > Imbedded in the text of all the postscript output files is a command > to set the color to RGB format. Since most color printers use > CYMK, to make plots in black, three inks are used: cyan, yellow > and magenta. The cost of replacing color cartridges -- in our case > three entire cartridges instead of one, black -- is getting to be a > problem. > > I am considering a script file that does a search and replace of the > postscript RGB command in the plot file, but there should a way of > changing the plot file text to begin with. > > Thanks in advance for your advice > > John Hobbie > NSBF > address@hidden >