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摘要

PPROBLEM TO BE SOLVED: To provide a standard density original printing method for a color image forming apparatus by which gradation recognizing accuracy is improved in the case of comparing with a regular color density sample. PSOLUTION: A cyan density gradation concentric circle part 23, a magenta density gradation concentric circle part 24 and a yellow density gradation concentric circle part 25 are respectively superposed to form a cyan and magenta color mixture part 27, a cyan and yellow color mixture part 28 and a magenta and yellow color mixture part 29. PCOPYRIGHT: (C)2004,JPO