| 摘要 |
An amount of a black colorant is determined from input color image signals. Then, chromaticity values, for instance, on the L*H*C* color space, of a color that is obtained by subtracting the above black amount from the input color image signals and represented by C, M and Y are determined. Finally, colorant amounts of C, M and Y are determined from the chromaticity values thus determined.
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