Method of generating an expanded color set of a low resolution color printer
US4894665A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1989 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Apr 20, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a low resolution color printer having a color set, a set of shaded colors is generated thereby expanding the color set of the printer. The method for generating the shaded colors determines if a critical line is to be printed. Then a check is made to determine if a shaded color is to be printed. If a pattern of a shaded color is to be printed, including a non-critical line, a first algorithm is used to generate a print buffer by interspersing a dark (quasi-black) colored pixel among the colored pixels, the blending effect resulting in a shaded color. If a critical line of a shaded color is to be printed, a second algorithm is utilized (to overcome a deficiency of the first algorithm) to insure an interspersing of the dark pixels with colored pixels. Otherwise, the pattern is printed in the designated color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.