| 摘要 |
PROBLEM TO BE SOLVED: To realize a spot color copying machine in which a specific color image is copied with the same memory capacity as that of a monochromatic copying machine. SOLUTION: A data separate section 2 uses a specific color flag signal to separate multi-gradation black and white/specific color mixture image data into black and white data and specific color data and they are fed to a black and white data coding section 5 and a specific color data coding section 6. They are coded separately, and code data La, Ld,ϕij are fed to a code data conversion section 7. Simultaneously a color mixture discrimination section 4 discriminates whether or not a color is mixed in the data. When the color is not mixed in the data based on the result of discrimination of the color mixture discrimination section 4, the code data conversion section 7 selects the code data fed from the black and white data coding section 5 or the specific color data coding section 6 and replaces the least significant bit of the code data Ld with a result of OR processing by the color mixture discrimination section 4. When any color is mixed, the high-order 4-bits of the code data La fed from the black and white data coding section 5 and the high-order 4-bits of the code data La fed from the specific color data coding section 6 are linked and the linked data are stored in a code memory 8 as new code data La.
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