Applying traps to a printed page specified in a page description language format
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United States of America Patent
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Jul 30, 1996
Issued Date -
N/A
app pub date -
Jan 26, 1994
filing date -
Mar 4, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A trapping technique that accepts a Postscript or other page description language (PDL) file and outputs a file in PDL format having the correct traps. The input page is first divided into subportions, or tiles, and the tiles are individually processed by evaluating the input file in a corresponding dipping window. Each tile is then analyzed to determine the presence of boundaries or intersections between page objects or color regions. A trapping analyzer generates trap vectors in accordance with a set of desired trapping rules which take into account existing traps and the proximity of other page objects. In a preferred embodiment, the trap vectors are then convened to PDL form.
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