Method for preparing polychromatic printing plates
US5113249A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of processing a file of recorded color separation values of color elements for use in preparing polychromatic printing plates in order to reduce or eliminate defects caused by misregistration by printing, includes the steps: (a) defining a plurality of predetermined color types; (b) identifying the color pairs where there is a change in color between adjacent color element; and (c) for each color pair, determining whether or not to make a frame according to first predetermined criteria based on specific combination of color types in the pair, and then according to second predetermined criteria based on the difference in luminance between corresponding color separations in the respective pair. For those color pairs in which a frame is to be generated, the location of the frame is determined according to third predetermined criteria based on specific combinations of color types in the pair, and then according to fourth predetermined criteria based on the sum of the luminances of each color in the color pair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.