20011212: Postscript color question

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
>