BLACK COLOR GENERATION AMOUNT DETERMINING METHOD IN BLACK PRINTING, A BLACK COLOR GENERATION AMOUNT DETERMINING APPARATUS IN BLACK PRINTING, A MEDIA HAVING RECORDED THEREON A BLACK COLOR GENERATION AMOUNT DETERMINING PROGRAM IN BLACK PRINTING
US6466332B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1998 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Jan 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to perform black printing in a color space for printing approximately equivalent element colors such as CMY, a CPU system multiplies an undercolor amount CMYmin which is a common minimum component in the element colors by a predetermined generation ratio BGR to generate a black color component. In this case, the generation ratio BGR of the black color component is made smaller as the data before conversion becomes brighter, whereby a generation amount Kout of the black color component is small for the brighter color if the undercolor amount CMYmin is the same. When the printing operation is performed with reference to a color conversion table for printing obtained in this way, a dot corresponding to the black color component is unremarkable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.