Standardization campaigns began with the safety and reliability of digital color reproduction hardware and the exchange of digital data, and produced relevant measurement methods and standards for quantifying printing parameters. Currently, it is seeking process definition for digital information transfer.
In general, countries have their own standardization organizations before they have international standardization organizations.
In the United States, there is an organization called the Graphics Technology and Standards Committee (CGATS). It is an organization approved by the United States National Bureau of Standards (ANSI) for the development of image printing standards. The International Organization for Standardization (ISO), composed of representatives of countries in the world, has the final say.
There are other standardization organizations that are not introduced here.
Some standards will help China produce its own ink color standard. Here we discuss some standards that are of interest to everyone.
In order to formulate these standard documents, a great deal of work has been done in various aspects. Now these documents have been published. In other words, if you think that these documents are helpful for establishing your color standard, you can use or refer to them.
First, the United States Standard CGATS.4 "Image Reflection Density Measurement" is introduced. It includes terms, measurement methods, image element components, and operating procedures. The standard focuses on the correct use of densitometers, which is the basis for establishing ink color standards. In the printing preparation process, the printer is used to determine the thickness of the ink film using a densitometer. This standard makes it possible for everyone to measure in the same way and is of great significance for later definition of standards for different printing processes.
CGATS.5-1993 Image Technology - Spectral Measurement and Colorimetry for Image Printing Technology is also an equivalent standard for spectrophotometric measurements. Spectral measurements in the SWOP ink inspection program are based on this standard.
The important link between CGATS.4 and CGATS.5 is that the density measurement and spectrophotometric measurement geometries are all 0/45, so the spectrophotometer can also be used as a densitometer. This is another feature of the new generation of handheld portable spectrophotometers that are currently in the industry. These two standards are the tools needed to measure color, characterize various printing processes, and handle color.
I said CGATS.6 "Image Printing Specification" (draft), similar to ISO12647. Ultimately these standards will define the colors of inks used in various printing processes from lithography, gravure to screen printing, and flexographic printing.
Another important standard involving inks is ISO 2846 "Complete Set Offset Inks - Colorimetric Characteristics." This standard precedes the definition of ink color more than any of the U.S. standards. Sometimes it is also seen as a European standard. It was recently revised.
The relevant parties are now sitting together to study the practicality of this standard. Many technical representatives from Japan, Germany, and the United States participated in the discussion. Each participant is asking the question: "Which country's ink can become the ISO color standard?" Of course, SWOP is a candidate, but European colors are the current standards. No one is quite sure what the Japanese color standard is, but only SWOP and Japanese inks have wet ink samples.
European ink is very close to a set of target points in terms of chroma. There is no place to sell standard inks. The representative of Germany provided some inks that meet current standards.
The three parties of the United States, Japan, and Germany inks are printed on the same paper with the same ink layer thickness, ie 0.7-1.19 grams per square meter. As a result, the color standards of the three countries have been adjusted slightly and are quite close enough to become an international standard. This may also be the case with Chinese ink. These minor adjustments include adding a little blue to the magenta in the United States and SWOP, and adding a little green to the blue in Europe. Due to problems such as color overprinting and transparency, the standard has not yet been completed.
This is a potential reference for Chinese ink color comparisons with other countries. This document includes print production and evaluation of near-standard reference colors. Need to explain once again that you can not buy ISO 2846 ink anywhere, but you can check whether your ink's color is close to the ISO2846 ink color.
In general, countries have their own standardization organizations before they have international standardization organizations.
In the United States, there is an organization called the Graphics Technology and Standards Committee (CGATS). It is an organization approved by the United States National Bureau of Standards (ANSI) for the development of image printing standards. The International Organization for Standardization (ISO), composed of representatives of countries in the world, has the final say.
There are other standardization organizations that are not introduced here.
Some standards will help China produce its own ink color standard. Here we discuss some standards that are of interest to everyone.
In order to formulate these standard documents, a great deal of work has been done in various aspects. Now these documents have been published. In other words, if you think that these documents are helpful for establishing your color standard, you can use or refer to them.
First, the United States Standard CGATS.4 "Image Reflection Density Measurement" is introduced. It includes terms, measurement methods, image element components, and operating procedures. The standard focuses on the correct use of densitometers, which is the basis for establishing ink color standards. In the printing preparation process, the printer is used to determine the thickness of the ink film using a densitometer. This standard makes it possible for everyone to measure in the same way and is of great significance for later definition of standards for different printing processes.
CGATS.5-1993 Image Technology - Spectral Measurement and Colorimetry for Image Printing Technology is also an equivalent standard for spectrophotometric measurements. Spectral measurements in the SWOP ink inspection program are based on this standard.
The important link between CGATS.4 and CGATS.5 is that the density measurement and spectrophotometric measurement geometries are all 0/45, so the spectrophotometer can also be used as a densitometer. This is another feature of the new generation of handheld portable spectrophotometers that are currently in the industry. These two standards are the tools needed to measure color, characterize various printing processes, and handle color.
I said CGATS.6 "Image Printing Specification" (draft), similar to ISO12647. Ultimately these standards will define the colors of inks used in various printing processes from lithography, gravure to screen printing, and flexographic printing.
Another important standard involving inks is ISO 2846 "Complete Set Offset Inks - Colorimetric Characteristics." This standard precedes the definition of ink color more than any of the U.S. standards. Sometimes it is also seen as a European standard. It was recently revised.
The relevant parties are now sitting together to study the practicality of this standard. Many technical representatives from Japan, Germany, and the United States participated in the discussion. Each participant is asking the question: "Which country's ink can become the ISO color standard?" Of course, SWOP is a candidate, but European colors are the current standards. No one is quite sure what the Japanese color standard is, but only SWOP and Japanese inks have wet ink samples.
European ink is very close to a set of target points in terms of chroma. There is no place to sell standard inks. The representative of Germany provided some inks that meet current standards.
The three parties of the United States, Japan, and Germany inks are printed on the same paper with the same ink layer thickness, ie 0.7-1.19 grams per square meter. As a result, the color standards of the three countries have been adjusted slightly and are quite close enough to become an international standard. This may also be the case with Chinese ink. These minor adjustments include adding a little blue to the magenta in the United States and SWOP, and adding a little green to the blue in Europe. Due to problems such as color overprinting and transparency, the standard has not yet been completed.
This is a potential reference for Chinese ink color comparisons with other countries. This document includes print production and evaluation of near-standard reference colors. Need to explain once again that you can not buy ISO 2846 ink anywhere, but you can check whether your ink's color is close to the ISO2846 ink color.
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