Method of processing color image

Details Method of processing color image Method of processing color image

1986-06-10

1988-07-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, H04N 146

Patent

active

047588853

ABSTRACT:
A color image processing method and apparatus whereby a color image signal of an input system having a wide color reproducing range with respect to the brightness and saturation, such as an apparatus for producing a color television signal, is converted into a color image signal of an output system having a narrow color reproducing range, such as an ink jet color printer. With this method, a plurality of color points out of the color reproducing range of the output system are compressed and mapped to a plurality of color points in this range, respectively, with the hue held constant on the basis of a white point on the chromaticity diagram as a standard. In the compressing and mapping processes, the brightness is first compressed and the saturation is then compressed. In this manner, by compressing and mapping each point in the color unreproducible range of the output system to a point in the color reproducible range, a high quality color image can be derived.

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