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Multi-target optimization and color-matching method of special-color ink in offset printing

A multi-objective optimization, ink technology, applied in printing, printing machines, general parts of printing machinery, etc., can solve problems such as difficult practical application, and achieve the effect of reducing spectral heterogeneity, eliminating influence, and simple calculation process

Inactive Publication Date: 2012-10-17
HANGZHOU DIANZI UNIV
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  • Description
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Problems solved by technology

However, since the direct spectral matching method requires that the inks, substrates, diluents and other materials involved in color matching must be completely consistent with those used in the establishment of the color matching database, it is difficult to be practically applied.
Therefore, it can be seen that both the tristimulus value color matching method and the spectral color matching method have certain deficiencies.

Method used

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  • Multi-target optimization and color-matching method of special-color ink in offset printing
  • Multi-target optimization and color-matching method of special-color ink in offset printing
  • Multi-target optimization and color-matching method of special-color ink in offset printing

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Embodiment

[0043]Embodiment: An actual offset printing ink spot color matching process is taken as an example to illustrate the operation process and details of the present invention.

[0044] Step (1): Calibration and coloring. Here, three inks of medium yellow (Y), magenta (M) and medium blue (B) produced by Hanghua Ink Co., Ltd. are used as base colors, according to 5%, 10%, 25%, 50%, 75%, 100% gradient concentrations are mixed with diluent, mixed evenly, and proofed with IGT C1 offset printing ink proofer under 550N pressure, and measured with X-rite530 spectrophotometer, and D50 light source is selected for measurement and 2-degree viewing angle, each sample was measured 3 times to obtain the spectral reflectance curve of medium yellow (Y) under different gradient concentrations (such as figure 2 ), the spectral reflectance curves of magenta (M) at different gradient concentrations (such as image 3 ), the spectral reflectance curves of medium blue (B) under different gradient con...

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Abstract

The invention relates to a multi-target optimization and color-matching method of special-color ink in offset printing. The traditional method can not realize accurate ink color matching. The method comprises the following steps of: firstly calibrating and coloring, and calculating a unit concentration value of each ink; secondly, measuring a spectral reflectivity value of a target sample and a substrate, and calculating a unit concentration value of the sample and the substrate; then establishing a constraint condition and a target function of a multi-target optimization color-matching model, and finally calculating and obtaining a corresponding formula by utilizing a Pareto disaggregation optimization method according to the target function of the multi-target optimization color-matching model. The multi-target optimization and color-matching method has the characteristics of simple and convenient calculation process; in the color matching process, the color-difference minimization between the formula and the sample is considered, simultaneously the spectrum isomerism between the formula and the sample is reduced, and the influence of different light sources on the color matching result is furthest eliminated.

Description

technical field [0001] The invention belongs to the technical field of printing, and in particular relates to a method for multi-objective optimal color matching of offset printing spot color inks. Background technique [0002] With the development of the printing industry, the society has continuously put forward higher and higher requirements for the quality of printed matter, and more and more people are beginning to pursue the accurate reproduction of the printing color on the original manuscript. Spot color printing refers to the use of special spot color inks instead of synthesizing a certain color by four-color overprinting of cyan (C), magenta (M), yellow (Y) and black (K) during printing. to print that color. Since each spot color has its own fixed hue, it can ensure the accuracy of the color in printing, thus solving the problem of color transfer accuracy to a large extent, making spot color printing widely used in packaging printing, wallpaper production and oth...

Claims

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Application Information

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IPC IPC(8): B41F33/00
Inventor 林剑
Owner HANGZHOU DIANZI UNIV
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