Gamut mapping based on numerical and perceptual models
AssigneeRicoh Production Print Solutions LLC
InventorsYue Qiao, Joan L. Mitchell
Life of this patent
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Abstract
Methods and systems herein provide for color conversion. Such color conversion includes gamut mapping by determining a color gamut of an imaging device and receiving color data having color values external to the color gamut of the imaging device. The gamut mapping proceeds by determining a color region external to the color gamut and mapping the color values within the color region to the color gamut. Thereafter, the area of the color region is increased and the color values within the increased color region are mapped to the color gamut.
Claims19
A method of color conversion, the method comprising:
- determining a color gamut of an imaging device;
- receiving image data having color values external to the color gamut of the imaging device;
- determining a color region of the image data external to the color gamut;
- mapping the color values within the color region to the color gamut;
- iteratively increasing an area of the color region;
- and
- mapping the color values within the increased color region to the color gamut.
A color conversion system, comprising:
- an imaging device operable to generate image data having a plurality of color values;
- and
- a processor operable to convert the color values of the image data to a color gamut of another imaging device, wherein the processor determines a color region external to the color gamut, maps the color values within the color region to the color gamut, iteratively increases an area of the color region, and maps the color values within the increased color region to the color gamut.
A printing system, comprising:
- a printer;
- an imaging device operable to generate image data having a plurality of color values;
- and
- a printer controller operable to process the color values of the image data and map the color values to a color gamut of the printer by determining a color region external to the color gamut, mapping the color values within the color region to the color gamut, increasing an area of the color region, and mapping the color values within the increased color region to the color gamut.
A method of color conversion, the method comprising:
- determining a color gamut of an imaging device;
- receiving image data having color values external to the color gamut of the imaging device;
- determining a color region of the image data external to the color gamut;
- mapping the color values within the color region to the color gamut via a numerical model of the color gamut;
- mapping the mapped color values to the color region via a numerical model of the color region;
- and
- comparing the mapped color values of the color region to original color values of the color region to determine whether the mapped color values correspond to the original color values.
A software program configured on a non-transitory computer readable medium and used in color conversion, the software program comprising instructions that are configured to direct a processor to:
- determine a color gamut of an imaging device;
- receive image data having color values external to the color gamut of the imaging device;
- determine a color region of the image data external to the color gamut;
- map the color values within the color region to the color gamut;
- iteratively increase an area of the color region;
- and
- map the color values within the increased color region to the color gamut.
Dependencies are inferred from the claim text.