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Trapping

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Overprinting / Surprinting Avoids Need to Trap
Layers of ink can prevent some gaps from occurring

Overlapping layers of ink to avoid need for trapping may result in color shifts.

If you overprint (also called surprinting) you are actually printing one color of ink over the top of another layer of ink. Depending on the colors you will get varying degrees of noticeable changes in color where the two objects overprint.

Using the same image from our knockout example, if we actually did print the dark gray circle on top of the yellow circle the color where they overlap would be slightly different (simulated and exaggerated in the illustration).

In some instances, overprinting may be desirable and the results better than attempting to trap the colors. Small amounts of overprinting are often less noticeable than the white space that might occur with untrapped knockouts and easier to do than trying to set a perfect trap.

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  8. Trapping - Overprinting or Surprinting to Prevent Gaps and Avoid the Need for Trapping

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