Black generation to optimize color gamut volume and quality within limits on colorant usage
US10778870B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2019 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Oct 4, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for generating device-dependent color values which satisfy a colorant limit for an output device includes, for an input color defined by input values for three color channels in a first device-dependent color space, converting the input values to a hue angle θ, a saturation S, and value V in a second device-dependent color space. Minimum, maximum and middle ones of the input values are identified. The minimum is set to zero and the middle adjusted to maintain the input hue angle. A hue leaf relating output colorant mixture to input color can be constructed for the hue angle, and partitioned into regions. The region of the hue leaf containing the input color is identified and interpolated to identify intermediate values for the input color in a third device-dependent color space, such as CMYK. Output values in the third device-dependent color are the intermediate values or values derived therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.