Trapping - Choke

When designing print documents, an overlap area must be set for adjacent color areas to prevent the paper white from appearing during printing. This controls the process of overprinting.

The lighter ink is enlarged and superimposed on the darker ink.

Trapping enlarges the border areas of a lighter element on a darker background. During choking, a darker element lies on a lighter background whose border areas are extended.


The width of the necessary overfill or underfill area depends on the printing process, the material and the machine format. In most cases, the automatic settings of the layout programs and output devices are sufficient, so that coordination with the print shop is only necessary in special cases.

Trapping (overfilling) in print documents

Choke (underfilling) in print documents