Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1993-07-19
1996-05-07
Le, Nancy
Facsimile and static presentation processing
Facsimile
Recording apparatus
358518, 358520, 358521, H04N 121, G03F 308
Patent
active
055151728
ABSTRACT:
The present invention changes a color corresponding to a source color to a destination color by initially selecting a target source color and a target destination color. The selected target source color is converted to a source hue value, a source chroma reference value, and a source lightness reference value, and the selected target destination color is converted to a destination hue value, a destination chroma reference value, and a destination lightness reference value. A circuit then generates a first set of source/destination chroma and a first set of source/destination lightness values representing source/destination chroma and lightness relationships, respectively, for sources values in a range from the source chroma and lightness reference values, respectively, to minimum source chroma and lightness values, respectively, using a first and third function, respectively. The circuit also generates a second set of source/destination chroma values and a second set of source/destination lightness values representing source/destination chroma and lightness relationships, respectively, for source values in a range from the source chroma and lightness reference values, respectively, to maximum source chroma and lightness values, respectively, using a second and fourth function, respectively. These values are stored. Received color data is converted to a color hue value, a color chroma value, and a color lightness value. A comparator determines if the color hue value corresponds to the source hue value. When the comparator determines that the color hue value corresponds to the source hue value, destination chroma and lightness values associated with the source chroma and lightness values, respectively, that corresponds to the color chroma and lightness values, respectively, are selected based on the stored source/destination chroma and lightness relationships, respectively. The destination hue value and the selected destination chroma and lightness values are converted into output color data representing the destination color.
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patent: 5200832 (1993-04-01), Taniuchi et al.
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Patent Abstracts of Japan, vol. 17, No. 188 (E-1349), 13 Apr. 1993 and Jp-A-04 336869 (Fuji Xerox Co. Ltd.) 25 Nov. 1992.
Webster's II New Riverside University Dictionary. Eds Anne H. Soukhanov et al. Boston, MA: Houghton Mifflin Company, 1988.
Gordon Raquel Yvette
Le Nancy
Nickerson Michael J.
Xerox Corporation
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