| 摘要 |
PROBLEM TO BE SOLVED: To convert a color, while including preferable corresponding within a color reproducing range by transforming the highest saturation color of respective hues in a color image signal into a highest saturation color for each hue reproducible for a color printer having lightness higher than a minimum lightness difference. SOLUTION: As image information to be used for a display device, such as CRT, an RGB signal is transformed into CIELab as a representative equal color space by operation corresponding to the color temperature, chromaticity coordinates and photoelectric transfer characteristics of the display device by an RGB to Lab transforming part 101. The Lab signal transformed by the RGB→Lab transforming part 101 is compressed into color (L', a', b') for the output of a color printer 105 by a lightness (saturation) compressing part 102, while referring to a value set by the minimum lightness difference setting part 106, and color-transformed into a CMY signal as a color image signal for printer by a memory map interpolating part (color conversion) 103. Thus, the color is transformed into the highest saturation color for each hue reproducible at least for the color printer provided with the set lightness for minimum lightness difference maintenance.
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