| 摘要 |
A method and an apparatus of the present invention is capable of matching an image of a printed matter with a desired image with high accuracy by adjusting tints even when tints change while printing. There are provided a measurement means that measures gray Lab values of a printed matter, a calculation means that calculates DeltaL, Deltaa, and Deltab that are differences between the measured Lab values and predetermined target gray Lab values, a first correction value calculation means that corrects Deltaa based on Deltab, a second correction value calculation means that corrects DeltaL based on a corrected value Deltaa1 that has been calculated by the first correction value calculation means, a halftone density difference calculation means that calculates halftone density differences of C, M, and Y based on Deltab, Deltaa1 and DeltaL1 obtained by correcting DeltaL, an ink density difference conversion means that converts the calculated C, M, and Y halftone density differences into ink density differences, and an ink feed amount adjustment means that adjusts the ink feed amount for the ink fountain keys based on the ink density differences.
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