Method for controlling the inking of a printing press by determining color value gradients
US6012390A · kind A · utility
4Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F33/0045
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for the determination of the color value gradients of a picture element of a printed image when there are changes in the layer thicknesses of the inks used in the printing, the picture element (4) is photo-electrically scanned in the visible range of the spectrum and also in the near infrared range. From the scanning signals thereby obtained, color coordinates or an approximated subjectively equidistant color system and at least one infrared value is formed. The color value gradients are then calculated from these color coordinates and the at least one infrared value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.