Trap shaping

Details Trap shaping Trap shaping

2006-07-11

2006-07-11

Luu, Matthew (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

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Reexamination Certificate

active

07075551

ABSTRACT:
Methods and-apparatus implementing a technique for forming a trap polygon which does not interfere with the print quality of other trap polygons or objects. Edges in close proximity to a color transition edge (“CTE”) are checked for potential interference. A trap polygon is formed for the CTE that avoids any interfering edges or trap polygons for those edges. The technique can be applied to form a trap polygon for each edge in a page to be printed. In general, in one aspect, forming a trap polygon for trapping a color transition edge, where the trap polygon has an associated trap color determined by colors defining the color transition edge, includes: identifying one or more potentially interfering edges which intersect a keep away zone defined by the color transition edge; screening the potentially interfering edges to identify interfering edges which are part of an object which is of a significantly different color than the trap color; and forming a trap polygon for trapping the color transition edge including shaping the trap polygon to avoid overlapping objects and any trap polygons corresponding to any interfering edges.

REFERENCES:
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patent: 5313570 (1994-05-01), Dermer et al.
patent: 5402534 (1995-03-01), Yeomans
patent: 5412877 (1995-05-01), McKendrick
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patent: 5613046 (1997-03-01), Dermer
patent: 5668931 (1997-09-01), Dermer
patent: 5760779 (1998-06-01), Yamashita et al.
patent: 5832127 (1998-11-01), Healey
patent: 6031544 (2000-02-01), Yhann
patent: 6236754 (2001-05-01), Harrington
“The Complete Guide to Trapping,” (2nd Ed.), Brian P. Lawler, 1995 Hayden Books.

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