Mitsubishi Heavy Industries Limited

Syuuchi Takemoto

Norifumi Tasaka

Ikuo Ozaki

The invention relates to picture color tone control for a printing press. A target color mixture halftone density for each ink supplying unit width when a printing picture is divided with an ink supplying unit width of ink supplying apparatusis set, and an actual color mixture halftone density for each ink supplying unit width of an actually printed sheet obtained by printing is measured using an IRGB densitometer. The color mixture halftone densities are individually converted into tone values. A changing ratio for the converted target tone values is set suitably and is reflected on the target tone values and then converted into a monochromatic halftone density. Then, a solid density difference corresponding to a difference between the target monochromatic halftone density and an actual monochromatic halftone density is determined, and the ink supplying amount is adjusted for each ink supplying unit width in response to the solid density difference. The density of each ink can be changed freely to the target density set based on plate making data and so forth.

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Mihara, Japan

Syuuchi Takemoto