This year, we're getting clubcard to print our annual calendars. However, living in the world of reflected light they accept artwork in CMYK colour space, and not RGB .
This opened up the can of worms that we had mostly been ignorant of before -- colour management. There are lots of resources on the web for how to set up a workflow for colour management.
However, I needed to stitch a pages from different sRGB sources, and convert them to CMYK.
The best way I found to do this was:
* rasterize the images to TIFF in RGB space. I used ghostscript
* get sRGB and CMYK colour profiles from Adobe
* use LCMS (Little Color Management System) to project the images from RGB to CMYK
* compress the resultant tiffs and hand them off
Although ghostscript can rasterize directly to CMYK TIFFs, I was unable to find how to apply a colour profile to the process, and the results were poor.
In the future, I'll just use Scrubus to generate the whole thing directly in CMYK.
A weblog by Jack Cummings