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64. About Trapping

When a document containing multiple colors is printed, the printing process normally requires several passes, one for each color. If the paper is not perfectly aligned during each pass, colors that should appear touching each other sometimes have gaps between them. This is called misregistration. To compensate for this misregistration, printers employ a process called trapping, where one object slightly overlaps an object of a different color. This slight overlap ensures that, even if the paper is not perfectly aligned during each pass, no gaps appear between colors.

KEY TERMS

Registration— Refers to the alignment of the paper during the printing of different colored inks. In a perfectly aligned print job, all the colors print directly on top of each other.

Misregistration— The result of poorly aligned printing passes, it causes unwanted gaps between colors.

Trapping— A technique used to compensate for misregistration. With trapping, objects are adjusted so they intentionally overlap. This helps avoid the gaps of white space that often appear in misregistered print jobs.



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