Adobe, Inc.

Dennis Mercer

Richard A Dermer

Douglas Richard Becker

Stephan R Yhann

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.

Trap shaping

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 (&ldquo;CTE&rdquo;) 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.

A method of trapping objects for a page includes identifying sequential matching objects, combining into a larger object matching sequential objects including parameterizing each object as a band in the larger object and trapping non-matching objects and the larger object. In another aspect, a method of preparing a page to be printed is provided that includes receiving a page description language file describing the page to be printed, identifying sequential matching objects in the page description file that represent a gradient to be printed on the page and combining into a larger object matching sequential objects. The step of combining includes defining an outline for the object and a defining a function describing the coloring for the object.

Vignette recognition and compression

Method and apparatus for rasterizing a resolution-independent page description for printing. A peeker (gap between two visible edges in vector representation that is narrower than a printer pixel) is identified between a first visible edge and a second visible edge, and a color adjustment is made to at least one of the edges. In one embodiment, a side of the second visible edge facing a side of the first visible edge is identified. The color of the identified side of the first visible edge is changed based on the color of the identified side of the second visible edge. The color adjustment is advantageous in connection with methods of trapping.

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Auburn, NH, United States of America

Dennis Mercer