Method of obtaining colorimetric values
US6469804B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1998 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Nov 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/466
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To obtain colorimetric values intended for regulating inking on a printing press (1) from a printed image (3) produced by the printing press (1), the printed image is measured calorimetrically in a plurality of pixels (4) with respect to a selected color coordinate system. The color vectors thus obtained for each pixel (4) are used to calculate color difference vectors to predetermined reference color vectors based on the same color coordinate system or reference color vectors determined from a reference printed sheet (3). The color difference vectors are multiplied by a weighting factor determined from the ink coverage of the pixels (4) and/or the color differences between the pixels (4) and their neighboring pixels (4). The color difference vectors weighted in this way can then be used as colorimetric values for regulating the inking on the printing press (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.