Method and device for calibrating gray balance

Abstract

The invention discloses a grey balance calibration method and a grey balance calibration device. The grey balance calibration method and the grey balance calibration device are used for automatically and accurately calibrating grey balance in real time. The method includes: after each grey-balance color target map is generated, determining that all color block areas with color difference values exceeding a color difference threshold are to-be-adjusted color block areas; detecting all of the color block areas to acquire measurement density of three colors including yellow, fuchsine and cyan of each color block area; respectively determining corresponding reference density according to the measurement density of the three colors of each to-be-adjusted color block area, and setting reference density of the color block areas requiring no adjustment to be equal to the measurement density; respectively generating a linear curve according to the measurement density and the reference density corresponding to each color; for each color, generating a new adjustment curve by fitting of the currently generated linear curve and a finally generated adjustment curve of a corresponding color of a last generated grey-balance color target map.

Description

technical field [0001] The invention relates to the field of ink printing, in particular to a gray balance calibration method and device. Background technique [0002] With the development of technologies such as digital proofing and digital printing, color management plays an increasingly important role in printing production. Color is the core of print quality control, and its key technology is how to correctly reproduce the gray in the original manuscript. Therefore, the control of gray balance is of great significance for faithfully reproducing the original manuscript and obtaining high-quality printed matter. a key part of [0003] Gray balance means that the three color plates of yellow Y, magenta M and cyan C generate neutral gray on the printed matter according to the proportion of different dot area ratios. According to the color theory of subtractive color method, the superposition of the maximum saturation of C, M, and Y three primary color inks should get black...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the calibration of the gray balance mainly relies on manual adjustment, that is, the operator manually adjusts the linearization curves that generate these color target maps according to the color target maps that are printed out one at a time. It is a waste of time and cannot guarantee the efficiency of adjustment

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