Patent
1993-05-26
1995-08-01
Nguyen, Phu K.
G06F 1500
Patent
active
054386535
ABSTRACT:
A computer system for production of ink separations from an object-based print pre-process apparatus using a page description language. The print pre-process system facilitates creation of object spreads for any combination or configuration of objects on the rendered page. For each object on a rendered page, the computer system 100 makes use of a spread table to determine spread incidences. For each spread incidence, the computer system generates set union, intersection, difference, and edge extraction for spreading, receiving, and obstructing objects to create a simplified graph of contour histories providing a visible portion of the spread object. The visible boundary between the visible spread object and the receiving object is then extracted. The visible boundary is strokeable within a clipped window set to the receiving object. The stroke color and width, set by the spread table, can be knockout print or overprint. Alternatively, the visible spread boundary with given spread width can be cropped away from certain separations of the receiving object, rather than being stroked in a solid color.
REFERENCES:
patent: 5115479 (1992-05-01), Murayama
patent: 5134688 (1992-07-01), Corthout
Boenke Marke
Clegg Derek
Gittelsohn Mike
Passaretti Keith
Seymour-Marks Audrey
Island Graphics Corporation
Nguyen Phu K.
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