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Technology » Trapping

In high-quality reproduction of colour documents, the gaps caused by the misregistration of the press are commonly avoided by creating an overlap, called a trap, between areas of adjacent color. The Level 3 revision of Postscript defines rules and parameters for trap generation that the RIPs should follow in the Postscript interpretation and rendering process.

First figure: perfect registration; second figure: misregistration with no trapping; third figure: misregistration with trapping.

trapping

StudioRIP has a proprietary raster based technique for trapping with a rich set of features. Over and above the standard trapping features, here are some that other RIPs may not have:

· Narrowed traps: there are cases where the full width of the trap does not fit into the available spread area, in which case StudioRIP will reduce the trapping automatically. Details...
· Sliding traps: as the colour varies continuously across a vignette, the trap might jump suddenly from one side of the boundary to the other at some point. StudioRIP avoids this using the sliding trap technique. Details...
· Anamorphic traps: the misregistration in the X and Y directions in the printing process might be different. StudioRIP can compensate this by applying different trapping in X and Y directions. Details...
· Feathered traps: a blurred trap has a more pleasant look than the traditional sharp traps. Details...
· Color reduction: the visual impact of the trap can be minimized by reducing the density of the trap to match the original density. Details...
· Density limitation: a colour reduction that acts selectively for traps with a density over a certain limit, relative to the original density. Details...
· High quality shapes: excellent behaviour in junctions, in the proximity of a third color, and with slightly different colors. Details...

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