Method and apparatus of controlling quality of printed image for color printing press
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United States of America Patent
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Mar 6, 2012
Grant Date -
Jul 30, 2009
app pub date -
Jan 30, 2009
filing date -
Jan 30, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 ΔL, Δa, and Δb that are differences between the measured Lab values and predetermined target gray Lab values, a first correction value calculation means that corrects Δa based on Δb, a second correction value calculation means that corrects ΔL based on a corrected value Δa1 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 Δb, Δa1 and ΔL1 obtained by correcting ΔL, 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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