| 摘要 |
PURPOSE:To realize the conversion of a color agreeable with human sensual characteristics into the binary system and prevent a black letter from taking on color by a method wherein a color recognizer converts a many-valued picture signal into a coordinate on the same color difference space, and the connected signal is compared with a color identification func tion on the space, thereby to judge the hue. CONSTITUTION:A color copy taken by a scanner 1 is subjected to A/D conversion, and outputs a many-valued picture signal 8 in three primary colors. A color recognizer 2 converts a picture signal B into a coordinate on the same color difference space, the converted signal is compared with a color identification function on the same space to output a hue signal 9. A brightness calculator 3 calculates a brightness from the picture signal 8, and the value is subjected to a binary conversion with respect to a fixed threshold to be outputted as a black-and white signal 10. An achromatic color judging device 4 converts the picture signal 8 into a coordinate of the same color difference space, the converted value is compared with an achromatic color identification function to output a chromatic color/achromatic color judgement signal 11. A selector 5 selects either the hue signal 9 or the black-and-white signal 10 with the chromatic color/achromatic color judgement signal 11, to output a color signal 12. A printing signal generator 6 decides the ink to output a printing signal 13 to the printer. |
