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Method for detecting color difference of printed matter

A detection method and technology for printed matter, applied in the field of printing industry, can solve the problem that the detection data cannot accurately detect the color difference quality of the printed matter, and achieve the effect of increasing the added value of the product, improving the quality of the product and improving the accuracy.

Inactive Publication Date: 2011-01-05
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for detecting color difference of printed matter, which solves the problem that the detection data cannot accurately detect the quality of color difference of printed matter when detecting the color of printed matter in the prior art

Method used

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  • Method for detecting color difference of printed matter
  • Method for detecting color difference of printed matter
  • Method for detecting color difference of printed matter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Utilize the inventive method to calculate the color difference of certain test print and reference print under D65 light source, 2 ° field of view conditions, to judge whether the color of test print is qualified:

[0057] step 1,

[0058] Use the X-Rite SpectroEye spectrophotometer to measure the spectral reflectance ρ of the reference prints respectively 1 (λ) and the spectral reflectance ρ of the test print 2 (λ); the wavelength interval Δλ is 10nm, and the measured wavelength λ range is 380nm to 730nm; as shown in Table 1:

[0059] Table 1 Spectral reflectance of reference prints and test prints

[0060]

[0061] Step 2, calculate the color stimulus difference between the reference print and the test print:

[0062]

[0063] in, In order to refer to the color stimulus value of the printed matter, To test the color stimulus value of printed matter, S(λ) is the relative spectral power distribution determined according to the D65 light source, as shown i...

Embodiment 2

[0092] The Munsell system, as an internationally common uniform color system, has been widely used in the study of uniform color space, color difference, and color appearance. X-Rite SpectroEye spectrophotometer was used to measure the spectral values ​​of 1325 color samples in the Munsell Atlas, and the spectral measurement range was 380nm-730nm with an interval of 10nm. Among these color samples, 960 color pairs with a hue difference of 2.5, 961 color pairs with a lightness difference of 1, and 961 color pairs with a chroma difference of 2 were selected, totaling 2882 pairs. Convert hue difference, lightness difference and chroma difference into visual Difference.

[0093] Standard residual sum of squares index (STRESS, standardized residual sum of squares index) is used to evaluate the performance comparison between the method of the present invention and CIELAB, CMC, CIEDE2000 color difference formula.

[0094] The STRESS method is shown in the following formula:

[009...

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Abstract

The invention provides a method for detecting the color difference of a printed matter, which comprises the following steps of: firstly, respectively measuring the spectral reflectivity of a reference printed matter and the spectral reflectivity of a tested printed matter by using a spectrophotometer; secondly, calculating a color stimulus difference value of the reference printed matter and the tested printed matter; thirdly, calculating a tristimulus value difference of two colors of the reference printed matter and the tested printed matter; fourthly, calculating a difference of delta L*, delta a* and delta b* of the reference printed matter and the tested printed matter and a final color difference value of the two colors of the reference printed matter and the tested printed matter; and finally, judging whether the tested printed matter meets production requirements or not according to the color difference value. The method can accurately evaluate the color quality of the printed matter and can greatly improve the detection and control precision of quality of the printed matter so as to reduce rejection rate, reduce production cost, improve product quality and increase the added value of products.

Description

technical field [0001] The invention belongs to the technical field of printing industry, and in particular relates to a method for detecting color difference of printed matter. Background technique [0002] Color difference is a scientific and effective method used to evaluate the color difference between two samples. According to the calculated color difference obtained by the color difference formula, it can be judged whether the color difference of the sample pair is visually acceptable. Generally speaking, it is used to evaluate the color characteristics of colored products to judge whether the color of the product is qualified relative to the standard sample. So far, many color difference formulas have been proposed and applied to simulate the human eye's perception and judgment of color differences. Color difference evaluation is very important for the color quality control of industrial products, and it is an important indicator for color-using industries such as te...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/31
Inventor 郑元林戚永红
Owner XIAN UNIV OF TECH
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