Light pole laser paper and printed matter color difference measurement method

Abstract

The invention relates to light pole laser paper and a printed matter color difference measurement method. a color measurement automatic detection system is adopted, and in the case of measurement, the light pole direction of the light pole laser paper is vertical to the horizontal direction of a measurement platform; the distance between adjacent sampling points of a color measurement instrument in the horizontal direction of the measurement platform and the number are set, and color information of a sample at different positions is measured; in raw chroma data of a standard sample and a test sample and turnover chroma data obtained by arranging sampling point data in a reverse order, sampling points with the maximal L<*> value, the a<*> value and the b<*> value in a first light pole period are found out, and with the sampling points as reference, all chroma values are translated; and color differences and average color difference values are calculated, different alignment modes are taken to calculate the minimal color different value in the obtained average color difference value to serve as the final color different value for the standard sample and the test sample. All to-be-tested samples are unified to be positioned to corresponding positions on the light pole laser paper for sampling and comparison, and the measurement precision is improved.

Description

technical field [0001] The invention relates to a method for measuring the color difference of light column laser paper and its printed matter. Fix the position of the color measuring instrument and the paper or printed matter to be tested through the color measurement platform, set the number of sampling points and the sampling interval in the operating system, control the measuring head to collect the chromaticity values ​​of the standard sample and the test sample, and collect the collected Adjust the chromaticity values ​​of the standard sample and the test sample to the same cycle position to compare and calculate the color difference, and finally give the average color difference as the basis for judging. Background technique [0002] The bright rainbow effect of light column laser paper not only plays a decorative role, but also has a certain anti-counterfeiting effect, but it also brings a lot of trouble to the color measurement and production control of the packagin...

AI Technical Summary

Problems solved by technology

The repeatability of this measurement method is poor, and it has a certain one-sidedness. It can only reflect the color characteristics of the measured area of ​​​​the paper or printed matter, and cannot better reflect the overall quality of the paper or printed matter.

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