Basic workflow of computer color matching

Artificial color matching is highly dependent on the experience of the color matching personnel. The control of the color matching process relies on personal feelings, experience, and lack of standardization. The color matching process is difficult to control. The ink materials are consumed more and time-consuming, and the accuracy of the spot color inks dispensed is poor. The color matching efficiency is also low. In order to obtain the same color matching effect in different environments and different operators, and to improve the color matching efficiency, a computer color matching system has been introduced. The computer color matching system is a modern automatic color matching facility integrating measuring instruments, computers and color matching software systems. The basic principle of the computer color matching system is to express the color samples to be matched in the form of color data, and then determine the color of the color samples according to the color theory. The ratio of each base ink required. That is, the reflectance spectrum data of the color sample to be matched (or the chromaticity value of the color sample to be matched) is measured by a color matching measuring instrument, input into a computer, and treated by using an ink color database and related color matching software stored in the computer. The relevant color measurement data of the ink color sample is matched for processing, and the computer software calculates, iteratively corrects, and assigns the spot color, filters and outputs the ink formula that meets the requirements of the standard color sample, and the computer automatic color matching is completed. Today, color matching systems have been widely used in many companies. At present, more color matching software is used in China, such as DataColor's DataMacth and 3nh's PeColor. The basic working process of computer color matching is as follows:

Color matching process

1.In the first step, the color matching base database is established. Will base different ratios

The color reflectance or L, a, b chromaticity values are entered into the system to create a color matching base database. The color matching database is the core of the computer color matching system. The data used in all color matching calculations are derived from this database, so the accuracy of the database will directly affect the accuracy of ink color matching.。

2.Input the specified color sample related color data into the color matching system

Establish the standard value of the standard. The color sample may be an actual color sample, which may be a color sample tristimulus value X, Y, Z, or a spectral spectrum curve of the color sample. Among them, the most common one is the tristimulus value X, Y, Z of the actual color.

3.Run the color matching software, according to the color chromatic aberration threshold, color matching cost, ink characteristics, spectral curve matching index and other qualification conditions, the color matching system will give a variety of optional color matching scheme.

4.According to the actual situation, choose a good color formula proofing.

5.The colorimetric value of the proofing color is measured by a color measuring instrument, and the standard values of the color matching system and the standard color are input for analysis and comparison, and the color difference values of the two are calculated.

6.The initial formulation is iteratively modified based on the color difference until the most satisfactory ink formulation is obtained.

 

Computer color matching applies a lot of basic knowledge of color science, and requires high color knowledge of operators. Operators should have a certain understanding of the relevant knowledge involved, so that color matching software can be applied to obtain ideal color matching results.

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