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Chapter 24. Print > Trapping colors

Trapping colors

Trapping mini-glossary

Overprint

The foreground object color prints on top of the background color, so the inks actually mix together. Overprint is used if black is the foreground object color or if inks are intentionally mixed to produce a third (overlap) color.

Knockout

To prevent inks from overprinting, the foreground item's color shape is cut out (knocked out) of the underlying background color on the background color plate. Although this eliminates the problem of ink mixing, it creates a potential problem of a gap between the edges of the foreground and background colors. Trapping closes this gap.

Spread

The spread method of trapping is used when colors knock out and the foreground color is lighter than the background color. The edge of the foreground color object is enlarged slightly to make the foreground color spread into the background color on press .

In a spread trap, the foreground object color spreads into the background object color.


Choke

The choke method of trapping is employed when the foreground color is darker than the background color. The edge of the foreground color object shrinks slightly as a result of overprinting. This is because the background color spreads into (chokes) the foreground color on press.


Trapping is the deliberate overlapping of colors to help safeguard against gaps that may result on press due to the misalignment of plates, paper shifting, or paper stretching.


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