On press color control system

Details On press color control system On press color control system

1997-04-03

2000-02-15

Hilten, John

Printing

Inkers

Fountains

101484, B41F 3100

Patent

active

060240180

ABSTRACT:
A color control system for maintaining the color of a printed page of a printing press constant, within the context of the human perceptual color space system optimizes the settings of a plurality of ink keys in a printing press in accordance with a test image and a reference image. The test and reference images comprise a plurality of ink key zones corresponding to the plurality of ink keys, each ink key zone including a plurality of regions of interest (ROIs). The system includes a unit for imaging an area of the printed page in generating the reference and test images, a unit for extracting color information based on actual image colors from the test image, a unit for measuring color deviations with reference to the reference image, and a unit for analyzing and comparing global features of regions of interest (ROIs) that cover substantially the color gamut of the test image against like features of the reference image. The analysis and comparison is based on a plurality of ROIs, all located within the same ink key zone, and the analysis and comparing unit operates to generate a set of CMYK changes to be applied to the plurality of ink keys. The system also includes a unit for applying the set of CMYK changes to the plurality of ink keys.

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