Printing color quality detecting method of integrating visual measurement, density measurement and color measurement

A chromaticity measurement and quality inspection technology, applied in printing, printing presses, general parts of printing machinery, etc., can solve the problem of not directly reflecting the thickness of the ink layer, color depth and screen information, etc., to improve the quality of printed matter and work efficiency , The method is simple, and the effect of ensuring stability

Inactive Publication Date: 2009-09-02
WUHAN UNIV
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Problems solved by technology

The colorimeter is the most accurate for printing color quality inspection, but it cannot directly reflect the inf

Method used

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Embodiment Construction

[0022] The printing color quality detection method of the present invention integrated visual inspection, density measurement and chromaticity measurement comprises the following steps:

[0023] 1. For the production of printing control strips, on the basis of traditional control strips, spot color blocks are added; measurement and control strips include: C, M, Y, K solid color blocks (to detect solid density), spot color solid color blocks (to detect special color ink layer thickness change), C, M, Y, K50%, 75% dot color patch (detect relative contrast, get the best solid density), R, G, B solid overprint color patch (detect overprint rate), Neutral gray blocks (observe color cast) and signal elements for visual inspection (observe printing pressure).

[0024] 2. Add a control strip to the mouth or tip of the print, preferably the tip, and then print on the machine;

[0025] 3. Visual inspection; Visual color measurement must first determine the lighting conditions, generall...

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Abstract

The invention discloses a printing color quality detecting method of integrating visual measurement, density measurement and color measurement, which comprises the following steps: (1) based on the prior control strips, adding a spot color block, and placing the spot color block into an ink key area corresponding to a spot color part in a printed matter; (2) printing on a machine; (3) extracting the printed matter after a printing machine is stabilized to carry out visual measurement inspection, and taking out the printed matter passing the visual measurement; (4) measuring the colorimetric value of the printed matter by a colorimeter, and using the colorimetric value of the printed matter, the specified value of a sample and the color difference value of a digital sample or the prior sample as standards of qualification judgment; and (5) monitoring the density by adopting a density detecting method during printing. The method integrates respective advantages of the visual measurement, the density measurement and the color measurement, can detect the printing color quality more accurately, is simple and convenient, and is quite suitable for detecting the color quality of the printed matter.

Description

technical field [0001] The invention relates to a method for detecting printing color quality, in particular to a method for detecting printing color quality by comprehensive visual inspection, density measurement and chromaticity measurement, which belongs to the field of printing and packaging. Background technique [0002] The quality of color prints mainly refers to the reduction performance of color prints, which mainly includes three aspects: clarity, tone reproduction and color reproduction of printed products. Clarity refers to the ability of printed matter to reproduce detailed changes; tone reproduction refers to the ability of color printed matter to reflect the level of the original; color reproduction refers to the color quality, which refers to the ability of color printed matter to reproduce the color of the original. There are two ways to express colors in color images: one is spot color, and the other is standard four-color combination. No matter which form...

Claims

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Application Information

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IPC IPC(8): B41F33/00
Inventor 易尧华付文亭李磊
Owner WUHAN UNIV
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