System for softproofing a color reproduction
US5296947A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Oct 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6011
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Cyan, magenta, yellow and black ink are each used to print a color patch to obtain four color patches. Two of each pair of the three colorants cyan, magenta and yellow are used to print a red, a green and a blue patch. These seven color patches together with a patch formed by the printing medium with no colorant form eight color patches. A color monitor is adjusted until its screen color matches one of the eight color patches and the appearance values of the monitor are noted. This is repeated for each of the eight patches in order to compile a lookup table for the colors in each of the eight color patches. For softproofing, each square in a color grid pattern printed by the printer will contain portions, each of which has a color identical to one of the eight color patches. Using the lookup table, the values of the appearance signals corresponding to the colors of these portions in the square area are obtained for displaying a color patch on the color monitor of the same color. In this manner, the color image displayed by the monitor will closely resemble the printing result using actual inks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.