[R] RGB -> CYMK, with consistent colors

All, I used the very useful colorspace package for the plots in my book (pdf available here): http://knosof.co.uk/ESEUR/ The color makes the plots look great, on screen. To get lots printed, the printer requires converting the images to use cmyk (a common requirement for larger printers, I'm to

Re: [R] RGB -> CYMK, with consistent colors

Martin, Have you tried printed a few pages in CMYK? A monitor is based on mixing light using Red-Green-Blue. So it is not possible for the monitor to show CMYK which must be printed on paper to view correctly. Yes, I have printed some 'CMYK' pages. The blue is very obviously not cyan, as com

Re: [R] RGB -> CYMK, with consistent colors

Martin, However after some testing. I totally agree that CMYK handling in R using pdf(..., colormodel = "cmyk") is not correct. I thought the issue may be OS specific, but I get similar behavior on a Mac. I have discovered the Cyan tool: http://cyan.fxarena.net/ and will try it out. As vario

Re: [R] RGB -> CYMK, with consistent colors

Martin, However after some testing. I totally agree that CMYK handling in R using pdf(..., colormodel = "cmyk") is not correct. Looking at the source code of the function PostScriptSetCol in file src/librarygrDevices/src/devPS.c the conversion to CMYK looks correct. Looking at the generated p