Method for improving the quality of printing processes involving black pixel depletion
US6464334B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2001 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Jan 8, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for improving the quality of printing processes involving black pixel depletion by printing composite ink in pixel spaces where a black pixel depletion process leaves unfilled pixel spaces. Black pixel depletion data are employed (for example, a depletion mask is inverted) to generate a composite printing mask which designates pixel spaces which are candidates for being filled in with a composite ink. In a preferred embodiment, edge pixels of black fill areas are excluded from the candidate pixels. In a preferred embodiment, the white pixel spaces are filled in by printing a plurality of different colored inks (e.g., cyan/magenta/yellow or cyan/magenta) within these unfilled pixel spaces. In a preferred embodiment, the composite printing mask additionally serves as an under/overprinting (UOP) map.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.