ps-cmyk

Postscript CMYK Writing Plug-In for Gimp

Version 0.2

This is a horribly and ugily (is that a word?) hacked version of Peter Kirchgessner's ps.c Postscript plug-in for the Gimp, based on the version which comes with gimp-1.1.29. This version doesn't load anything, and can only save RGB images (i.e. no Greyscale or Indexed images). It writes out a CMYK Postscript file instead of a RGB postscript file. It uses the RGB-CMYK conversion algorithm from the Adobe "Red Book" (Postcript Language Reference Manual, 2nd ed.), p 305-306, with the following hardcoded definitions:

     UCR(k) = 0.5 * k
     BG(k)  = 0.7 * k

This was done quickly just to get it done (hence the support only of RGB). It's not pretty, but it seems to work.

Available in two forms:

• Source: ps-cmyk.c
• Binary: ps-cmyk

You might be able to get the binary to work just by sticking it in your GIMP 1.1 plug-ins directory. I can't guarantee this though; if all else fails download the source and "gimptool --install" it.

Comments and questions to Rob Knop at rknop@lbl.gov.