| 摘要 |
PURPOSE:To attain a color image forming method adapted to the human visual characteristic with a small circuit scale by performing a masking processing with a luminance signal and two color difference signals as inputs to obtain primary color signals for formation of a color picture. CONSTITUTION:The luminance signal is converted to a digital signal by an A/D converter 21 and is inputted to a gradation conversion characteristic setter 20 and a gradation converter 22. Plural conversion tables are prepared in the converter 22, and one conversion table is selected on a basis of a command from the setter 20. A luminance signal Y' obtained by gradation conversion is inputted to one input terminal of a masking ROM 24 as the address. Color difference signals R-Y and B-Y are converted to digital signals and are inputted to input terminals of the ROM 24 as addresses as they are. In the ROM 24, RGB conversion from Y', R-Y, B-Y to R, G, and B, complementary color conversion from R, C, and B to C, M, and Y, and the masking processing are performed.
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