Gravure printing image quality control method

Abstract

The invention provides a gravure printing image quality control method which comprises the following steps: first, manufacturing a CMYK color card; next, performing a printing test on the CMYK color card, so as to obtain a color reproduction curve under the premise that the dot gain is within a standard tolerance range; then, manufacturing a test version by utilizing the color reproduction curve, selecting three dots from each color on the color reproduction curve to control an image, and comparing the measured density values of the three dots with a standard value to judge whether each color meets the requirement within the tolerance range or not, wherein the three dots respectively correspond to dark tone, middle tone and highlight of the image; and finally, manufacturing a printing plate and a printing proof according to a standard sample, a color characteristic file and a standard color curve. By adoption of the gravure printing image quality control method provided by the invention, middle tone and shallow net control dots are added, so that direct engraving on the printing plate can be achieved and no other cost is needed; after a printing sample is obtained, whether the requirement is met or not can be determined through direct measuring, thereby avoiding the subjectivity in conventional visual sample measuring; the method is simple in judgement and easy to operate; and the accuracy and the standard property of gravure printing image quality control are improved.

Description

technical field [0001] The invention relates to a method for controlling the quality of gravure printing images, belonging to the technical field of gravure printing. Background technique [0002] For the printed image, usually the printing sample is first obtained by the printing machine, and after the printing sample is confirmed to be correct, the printing sample is used as the basis for the final visual judgment of the printing machine. This method works well when the printing press only needs to match its own proofs to a recognized standard. However, when a company has multiple printing machines, since the status of each printing machine may be inconsistent, it may lead to the problem that the output results of the same color on various devices are inconsistent. That is, the same color has different color spaces - color gamuts, for which color management is necessary. [0003] Simply put, the purpose of color management is to solve the problem of inconsistency in the ...

AI Technical Summary

Problems solved by technology

[0007] To sum up, with the existing on-site density measurement method, when the dark tones of the electrograph are inconsistent with the light and middle tones, it is difficult to judge whether it is a problem with plate-making dots or printing. It needs to rely on experience to judge, which is highly subjective and cannot be used. Uniform standards, method accuracy is not enough

Images