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9 Trapping > What is trapping?

What is Trapping?

Most designers do not really want to think about trapping. In fact, there is really nothing to it and it is important to bear in mind that, aside from general settings, no one else is likely to take care of it for you. While you can rely on your repro house or printer to deal with trapping to an extent, you cannot expect them to scrutinize every element in your page layout and figure out whether you applied trapping to your Adobe Illustrator or CorelDRAW drawings before importing them—and, unfortunately, it is in imported images of this kind that trapping is often forgotten.

When you have adjacent areas of different colors that are going to be printed by different ink units on a press—for example, a cyan area that touches a magenta area—then unless the registration on the press is perfect, the results will not be perfect. In fact they can be seriously unpleasant. Trapping is the means by which a small overlap is applied between the colors to ensure that the very slight amount of misregistration that you are almost sure to encounter when printing is covered up. The way it is best applied depends on the software you are using.


  

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