I’m printing some business cards, and the print shop won’t print rich black . They want everything at CYM=0 and K=100 (it’s cheaper for them). So now I have to change my pdf’s rich black into just K=100.
The thing is, the pdf is a mix of jpegs and vector images, so it’s not just a case of selecting objects and changing the colour values.
In Adobe Illustrator CS4, here’s the quick and easy solution:
Select all > Edit > Edit colours > Convert to Greyscale
Select all > Edit > Edit colours > Convert to CMYK
That’s it. If you open the file again in illustrator or photoshop, you’ll see that everything is now CMY=0 plus some value of K, 0 – 100.