Method for color adjustment and control in a printing press
US5224421A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1992 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Apr 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S101/45
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for color adjustment and control in a printing press wherein the density spectra of individual process colors as well as the density spectrum of the color of paper are stored with given fractional percentages. The density spectra of at least one measuring point per ink zone on a printing copy and at respective points on a printed product are then measured. The density spectra measured on the printing copy and the printed product are then expressed as a linear combination of the density spectra of the individual process colors and the density spectrum of the color of the paper multiplied by fractions, the fractions being calculated so that the density spectra of the printing copy and the printed product are approximated through the linear combination. In the case of a deviation of the fractions between the printed product and the printing copy, the positions of the ink keys are adjusted so that a match of the density spectra is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.