Color standard in CGATS standard and ISO standard

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The standardization movement of CGATS standard and color standard

in ISO standard began with the safety and reliability of expensive color reproduction hardware and digital data exchange, and produced relevant measurement methods and standards for quantifying printing parameters. The charging standard of assistance fund is adjusted year by year. At present, it is seeking a process definition for digital information transmission

generally speaking, there are national standardization organizations before international standardization organizations

in the United States, there is an organization called the Committee on image technology and standards (CGATS). It is an organization recognized by the American National Bureau of standards (ANSI) to develop image printing standards. The international organization for Standardization (ISO) is composed of representatives from all over the world and has the final say

there are other standardization organizations, which will not be introduced here

some standards will help China produce its own ink color standards. Here we discuss some standards of interest

a lot of work has been done in all aspects to formulate these standard documents. Now these documents have been published. In other words, if you think these documents are helpful in establishing your color standards, you can use or refer to them as much as possible

first introduce the American Standard CGATS 4 "image reflection density measurement", which includes terminology, measurement method, image element composition and operation steps. The standard focuses on the correct use of densitometer, which is the basis of establishing ink color standard. In the process of printing preparation, printers are used to measuring the thickness of ink film with densitometer. This standard enables everyone to measure with the same method, and is of great significance for defining standards for different printing processes in the future

CGATS for image printing technology "Image technology - spectral measurement and chromaticity calculation" is also the equivalent standard of spectrophotometry measurement. The spectral measurement in the swop ink inspection procedure is based on this standard

CGATS. 4 and CGATS The important connection between 5 is that the measurement geometric conditions of density measurement and spectrophotometric measurement are the same, which are 0/45, so the spectrophotometer can also be used as densitometer. This is another characteristic of the new generation of handheld portable spectrophotometer popular in the industry. These two standards are the tools needed to measure color, characterize various printing processes and process color

I said CGATS 6 image printing specification (Draft), similar to ISO 12647. Finally, these standards will define the colors of inks used in various printing processes from lithography and gravure to flexographic and flexographic printing

another important standard related to inks is iso2846 set of offset printing inks - colorimetric characteristics. 127; This standard defines ink color earlier than any American Standard. Sometimes it is also regarded as a European standard. It was recently revised

now, relevant parties are sitting together to study the practicability of this standard. Many technical representatives from Japan, Germany and the United States participated in the discussion. Every participant is asking such a question: which country's ink can become the color standard of ISO? Of course, swop is a candidate, but European color is the current standard. No one is quite sure about the color standard in Japan, but only swop and Japanese inks have wet ink samples

European ink is very close to a set of target points in chromaticity. In fact, there is no place to sell standard ink. The representative of Germany provided some inks that met the current standards

the United States, Japan and Germany set the ink according to the same ink layer thickness, i.e. 0 per square meter The range of 19 grams is printed on the same paper. As a result, the color standards of the three countries have been slightly adjusted, and each task they strive to put forward can be implemented, which is quite close, enough to become an international standard. The same may be true of Chinese ink. These minor adjustments include adding a little blue to magenta in the United States and swop and a little green to cyan in Europe. Due to the problems of color overprint and transparency, the standard has not been completed

this is a potential reference for the comparison of ink color between China and other countries. This document includes print production and evaluation of near standard reference colors. Again, you can't buy ISO 2846 ink anywhere, but you can check whether the color of your ink is close to that of ISO 2846


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