Image processing apparatus, printing apparatus and storage medium
US6530638B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2001 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Nov 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image printed by a printing apparatus, graininess particularly in a light part of the printed image is reduced by relatively simple structure by using a second color. To do so, magenta and cyan color component data in image data is subjected to under color removal to generate image data of a blue ink being the secondary color. On the basis of the data of the blue ink replaced for magenta and cyan, printing is performed by forming dots of the blue ink. At this time, black data is distributed into dark black and light black by density distribution, and the light black is substituted by the blue and yellow inks, whereby it is possible by the simple structure to prevent the graininess appeared when the cyan and magenta dots mutually appear biasedly and the graininess due to the black ink dots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.