Color image processing method and apparatus capable of properly determining black quantity
US5331440A · kind A · utility
26Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1993 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Apr 8, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Three input color separation signals are converted to three color signals on a uniform color space. A black quantity to be used for full-black reproduction is determined as the maximum black quantity of an output black signal. Then, an actual black quantity of the output black signal is determined based on the maximum black quantity and a chroma signal obtained from the uniform color signals. Finally, color quantities of respective output color signals other than the output black signal are determined based on the uniform color signals and the actual black quantity thus determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.