| 摘要 |
Three-dimensional LUTs produce a lightness signal L* from input color signals C, M and Y. The three-dimensional LUTs are respectively provided for four divisional sections of an input color signal K. A three-dimensional LUT switching device judges to what section a current value of the input color signal K belongs. A selector selects one of the LUTs in accordance with a judgment result. Similar processing is performed for chromaticity signals a* and b*. According to another aspect of the invention, three-dimensional LUT color converters produce color signals L2*, a2* and b2* based on only input color signals C, M and Y. A position in the L*a*b* space of the color signals L2*, a2* and b2* has a deviation from a position of color signals L1*, a1* and b1* to be output actually. Based on an input color signal K, a one-dimensional LUT produces a lightness signal L3*, which corresponds to the deviation. A color signal combining means produces final output color signals L1*, a1* and b1* based on the color signals L2*, a2* and b2* and the lightness signal L3*.
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