CMYK four-color printing chromatic aberration positioning method

A positioning method, four-color printing technology, applied in the direction of image communication, electrical components, etc., can solve the problem of unable to reflect the color difference value of each color plate

Active Publication Date: 2013-10-09
江苏元贞智能科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a CMYK four-color printing color difference positioning method to sol

Method used

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  • CMYK four-color printing chromatic aberration positioning method
  • CMYK four-color printing chromatic aberration positioning method
  • CMYK four-color printing chromatic aberration positioning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] A CMYK four-color printing color difference positioning method is specifically implemented through the following steps:

[0040] Step 1, use a color camera to capture the IT8Kodak Format standard color card, and read the RGB value of each color block of the color card image;

[0041] Step 2, from the supporting data file of the IT8Kodak Format standard color card in step 1, obtain the CMYK value of each color block on the standard color card;

[0042] Step 3: Substituting the RGB values ​​read in step 1 and the CMYK values ​​obtained in step 2 into a 14-term polynomial mathematical model, through the 14-term polynomial regression method, to establish the mapping relationship between RGB values ​​and CMYK values, and then adopt the minimum The polynomial coefficient a is fitted by the square method i , b i 、c i 、d i (i=0,1,...13);

[0043] The mathematical model of the 14-term polynomial is as follows:

[0044] C ...

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Abstract

Provided in the invention is a CMYK four-color printing chromatic aberration positioning method. An RGB color value and a CMYK color value of a color card are collected to establish a mapping relation between an RGB value and a CMYK value; an RGB color value of a reference printed matter image and an RGB color value of a to-be-detected printed matter image are converted into corresponding CMYK values; and an average chromatic aberration of two pictures in CMYK color space is calculated, thereby completing chromatic aberration positioning of four CMYK color plates. According to the method provided by the invention, the printed matter chromatic aberration is localized to a concrete printing color plate, so that a chromatic aberration source of the printed matter can be analyzed specifically. Therefore, the method plays a role in guiding a feedback guiding printing control process; and a problem that the existing chromatic aberration analyzing method can not reflect a chromatic aberration value of each color plate can be solved.

Description

technical field [0001] The invention belongs to the technical field of printing image quality detection and relates to a color difference positioning method for CMYK four-color printing. Background technique [0002] Nowadays, the printing speed is getting faster and faster, and the cost of printing materials is getting higher and higher. In the production process, once there are printing defects, it will cause a lot of waste of printing materials. At the same time, the processing of printing waste products will also pollute the environment. . Therefore, when printing defects are found, it is the key to reduce waste and pollution to analyze the faults in the printing process as soon as possible, and take measures to eliminate the abnormalities and restore the stability of the process. [0003] Chromatic aberration is one of the most common printing defects. When the color difference between the printed matter to be detected and the reference printed matter exceeds a certai...

Claims

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Application Information

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IPC IPC(8): H04N1/60H04N1/54
Inventor 张二虎段倩丹
Owner 江苏元贞智能科技有限公司
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