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Trapping

From time to time you might have a document printed and find that two objects of different colors that were set to print next to each other have a thin line separating them. This misregistration isn't uncommon, nor does it mean your printer isn't doing a good job. In any given printing situation, paper can slip or stretch on the press, as can the plates being used to print. When you see a slight misregistration, it most likely happened because you didn't set up trapping in your document.

Trapping is a process by which objects of different colors are created with a slight overlap to avoid any issues with misregistration on the press (see Figure 21.34). To create trapping, you must be working with a document in CMYK mode.


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