Method and system for color film separation preprocess using electronic object-based choking and spreading procedures including object combining operations
US5402530A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1991 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Aug 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2215/0094
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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 makes use of a spread table to determine spread incidences. For each spread incidence, the computer system generates set union, intersection and difference for spreading, receiving, and obstructing objects by use of a modified Weiler algorithm. The modified Weiler algorithm creates a simplified graph of contour histories providing a visible portion of the spread object, The visible object is strokable 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.