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Chapter 15.  Understanding Colors and Ch... > Prepping for Color Separations

Prepping for Color Separations

You need to use trapping only if your image will be output via traditional printing methods from CMYK color. Because the process literally lays down the ink colors in separate passes (on many printing presses), slight shifting in the paper or the printing plates can result in white gaps where the ink colors don’t abut as needed. To avoid this problem, you can use trapping to cause colors to overlap slightly so that there is no gap during printing.

NOTE

Most images only need trapping when they use large blocks or areas of solid color. Trapping an image with more variation, like a scanned photo, can actually cause problems with the color separations and ultimate print job. To see whether you need to use trapping in an image and to get some guidance about what trapping settings to use, consult your print shop.


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