How should traps and alignment be handled to prevent gaps due to misregistration?

How should traps and alignment be handled to prevent gaps due to misregistration?

• A. Trapping is unnecessary for most jobs.
• B. Trapping means printers reduce ink to save paper.
• C. To prevent gaps due to misregistration, adjust trapping only in the RIP.
• D. The proper approach is to ensure traps create overlaps between colors and verify registration accuracy during preflight.

Answer: (D)

Trapping is used to compensate for misregistration by creating deliberate overlaps at color boundaries. When two or more inks are printed on top of each other, even small misalignment between plates can leave white gaps or hairlines. By making traps — the slightly expanded edge of one color or the overlapping area between colors — you ensure those gaps won’t appear, keeping edges smooth and colors solid. To do this well, you design traps with appropriate width and direction for the job and the press you’re using, so adjacent colors overlap just enough without creating muddy edges. Then, in preflight, you verify that these traps are present and correctly set and that the overall registration across the sheet remains within acceptable tolerances. This combination — setting traps that create deliberate overlaps and confirming registration accuracy during preflight — is the reliable way to prevent gaps caused by misregistration.

Trapping is used to compensate for misregistration by creating deliberate overlaps at color boundaries. When two or more inks are printed on top of each other, even small misalignment between plates can leave white gaps or hairlines. By making traps — the slightly expanded edge of one color or the overlapping area between colors — you ensure those gaps won’t appear, keeping edges smooth and colors solid.

To do this well, you design traps with appropriate width and direction for the job and the press you’re using, so adjacent colors overlap just enough without creating muddy edges. Then, in preflight, you verify that these traps are present and correctly set and that the overall registration across the sheet remains within acceptable tolerances. This combination — setting traps that create deliberate overlaps and confirming registration accuracy during preflight — is the reliable way to prevent gaps caused by misregistration.