In the process of commercial transactions, it is particularly important to make appropriate quality assessments of printed matters. The complexity of the color printing process is well known. The production of a printed matter can only be completed after a dozen steps, which involve companies, staff, etc., in different environments. At different times, the evaluation methods or requirements for printed materials are also different. Therefore, in this process, some specifications and corresponding observation conditions need to be set.
Therefore, we can only subject the external factors such as the environment to the subjective evaluation of printed materials. Only in this way can we claim to be fair and objective, in order to reduce disputes caused by the environment. Therefore, the standard lighting environment and standard light sources are necessary. .
Print color difference
Chromatic aberration can be divided into (1) the color difference of the original: the color tone of the reproduced original is the purpose of the printing and copying, and the degree to which the printed matter and the original are indistinguishable from each other is the highest standard of subjective evaluation. (2) Color difference in the same batch: refers to the color error between different printed sheets in the same position of the same batch of products in the same hue area. (3) Similarities and differences in batches and colors: It refers to the color error between different batches of the same product. If the color of each batch of printing is slightly different, when they are put together, the customers will feel that the goods are old and new and even doubtful. Whether it's intrinsic quality will be as unstable as the appearance, it will cause mistrust of the product, and naturally it will cause manufacturers to dissatisfaction with the quality of the printing plant products.
Both the customer and the printer hope that the value of the color error is preferably zero. However, due to limitations in actual production conditions, it is impossible to completely eliminate the color error. Only by strengthening the quality control of each link can the product be The difference in color quality is controlled within the specified color difference standard. Color tolerance refers to the color difference between the print and the original or proofs that the customer can accept.
Subjective evaluation
The subjective evaluation of the color quality of the printed matter is based on the visual measurement method. After observing the printed matter and comparing it with the original or the proof, the observer makes his own judgment. The main consideration is the degree to which the color quality of the printed matter will be accepted by the customer.
Whether in the printing process or after the inspection of the quality, the printing operator or the quality inspection personnel should always evaluate the color quality of the printed product based on his own feelings and experience, based on the fidelity and authenticity of reproduction.
The fidelity of reproduction refers to the degree of reproduction of the color gradation of the original by the printed matter. The printed matter is a kind of copy. From the prepress to the entire color reproduction of the print, the original is the basis of our work, and the color tone of the reproduced original is the purpose of the print copy. The degree to which the printed matter and the manuscript reach true or false is the highest standard of subjective evaluation.
When there is no manuscript for comparison, the color quality of the print is related to the sense of reality, that is, it is required to meet the memory of most people. Most people have a habit of preconceived with common objects. If the subject's color in the printed matter is different from the color of a real object, this print cannot be called a high-quality replica. In short, the subjective evaluation criteria of the color quality of printed matter is to reproduce the truth, nature, and coordination, of course, sometimes with the intention of the customer or the use of the product slightly changed.
The definition of manuscript
In past years, most of the manuscripts came from photographed slides, photos, and hand-painted manuscripts. In the process of separation and writing, if you can approach the manuscript, it is regarded as effective color reproduction. On the other hand, printing is based on the approval of guest drafting. As long as 90% can be followed, it is generally considered as qualified.
However, the definition of manuscripts in the current computer age is more. For example, when guests see a satisfactory color on a computer screen or a printed manuscript, they think it is a manuscript. Regardless of the type of manuscripts, the colors they record or show may not necessarily be exhibited under normal printing conditions because each color reproduction system has its color gamut limitations. In the production process, the image ingestor is the original in the form of a manuscript. The color separation plate maker uses the photograph taken as the manuscript, and the printer uses the manuscript as the target of the color.
objective comment
The objective evaluation of the color quality of printed matter is to calculate the subjective evaluation result by statistical means, and then convert it into the corresponding physical quantity, and use it as an objective evaluation criterion. In this way, the influence of human factors in evaluation can be eliminated, and the color quality of various printed products can be fairly evaluated by the standardized unified standards, which ultimately makes it more consistent with the subjective evaluation standards of most people. The objective evaluation method mainly uses specific measuring instruments and tools, and measures some standard elements printed with the print image. It is only through measurement that automatic control of print quality is possible to some extent.
Color quality and production control
In order to produce high-quality color prints, the quality control of the production process must be strengthened, and the quality control relies mainly on the objective evaluation criteria of the product, that is, to develop a strict set of data specifications and measure objectively with various instruments. Evaluate the print quality and other aspects of quality.
The purpose of color control management is to improve the small gap between originals, proofs, and products. In the printing process, if the printed matter can be spot checked at any time, the problem can be found through the biased information, the cause can be found in time, and the problem can be corrected so as to ensure the reproduction quality of the printed matter. In addition to the use of density as a parameter to reflect the color quality of prints, it is necessary to promote the CIE Lab color value of the color as a parameter for checking the print quality.
Every link must be managed by data, and every step must be tested by inspection tools. Otherwise, many mistakes will occur. Nowadays, with the continuous advancement of process technology, the color control means in printing have also been further developed. The new color management system makes printing color control easier and more effective.
Therefore, we can only subject the external factors such as the environment to the subjective evaluation of printed materials. Only in this way can we claim to be fair and objective, in order to reduce disputes caused by the environment. Therefore, the standard lighting environment and standard light sources are necessary. .
Print color difference
Chromatic aberration can be divided into (1) the color difference of the original: the color tone of the reproduced original is the purpose of the printing and copying, and the degree to which the printed matter and the original are indistinguishable from each other is the highest standard of subjective evaluation. (2) Color difference in the same batch: refers to the color error between different printed sheets in the same position of the same batch of products in the same hue area. (3) Similarities and differences in batches and colors: It refers to the color error between different batches of the same product. If the color of each batch of printing is slightly different, when they are put together, the customers will feel that the goods are old and new and even doubtful. Whether it's intrinsic quality will be as unstable as the appearance, it will cause mistrust of the product, and naturally it will cause manufacturers to dissatisfaction with the quality of the printing plant products.
Both the customer and the printer hope that the value of the color error is preferably zero. However, due to limitations in actual production conditions, it is impossible to completely eliminate the color error. Only by strengthening the quality control of each link can the product be The difference in color quality is controlled within the specified color difference standard. Color tolerance refers to the color difference between the print and the original or proofs that the customer can accept.
Subjective evaluation
The subjective evaluation of the color quality of the printed matter is based on the visual measurement method. After observing the printed matter and comparing it with the original or the proof, the observer makes his own judgment. The main consideration is the degree to which the color quality of the printed matter will be accepted by the customer.
Whether in the printing process or after the inspection of the quality, the printing operator or the quality inspection personnel should always evaluate the color quality of the printed product based on his own feelings and experience, based on the fidelity and authenticity of reproduction.
The fidelity of reproduction refers to the degree of reproduction of the color gradation of the original by the printed matter. The printed matter is a kind of copy. From the prepress to the entire color reproduction of the print, the original is the basis of our work, and the color tone of the reproduced original is the purpose of the print copy. The degree to which the printed matter and the manuscript reach true or false is the highest standard of subjective evaluation.
When there is no manuscript for comparison, the color quality of the print is related to the sense of reality, that is, it is required to meet the memory of most people. Most people have a habit of preconceived with common objects. If the subject's color in the printed matter is different from the color of a real object, this print cannot be called a high-quality replica. In short, the subjective evaluation criteria of the color quality of printed matter is to reproduce the truth, nature, and coordination, of course, sometimes with the intention of the customer or the use of the product slightly changed.
The definition of manuscript
In past years, most of the manuscripts came from photographed slides, photos, and hand-painted manuscripts. In the process of separation and writing, if you can approach the manuscript, it is regarded as effective color reproduction. On the other hand, printing is based on the approval of guest drafting. As long as 90% can be followed, it is generally considered as qualified.
However, the definition of manuscripts in the current computer age is more. For example, when guests see a satisfactory color on a computer screen or a printed manuscript, they think it is a manuscript. Regardless of the type of manuscripts, the colors they record or show may not necessarily be exhibited under normal printing conditions because each color reproduction system has its color gamut limitations. In the production process, the image ingestor is the original in the form of a manuscript. The color separation plate maker uses the photograph taken as the manuscript, and the printer uses the manuscript as the target of the color.
objective comment
The objective evaluation of the color quality of printed matter is to calculate the subjective evaluation result by statistical means, and then convert it into the corresponding physical quantity, and use it as an objective evaluation criterion. In this way, the influence of human factors in evaluation can be eliminated, and the color quality of various printed products can be fairly evaluated by the standardized unified standards, which ultimately makes it more consistent with the subjective evaluation standards of most people. The objective evaluation method mainly uses specific measuring instruments and tools, and measures some standard elements printed with the print image. It is only through measurement that automatic control of print quality is possible to some extent.
Color quality and production control
In order to produce high-quality color prints, the quality control of the production process must be strengthened, and the quality control relies mainly on the objective evaluation criteria of the product, that is, to develop a strict set of data specifications and measure objectively with various instruments. Evaluate the print quality and other aspects of quality.
The purpose of color control management is to improve the small gap between originals, proofs, and products. In the printing process, if the printed matter can be spot checked at any time, the problem can be found through the biased information, the cause can be found in time, and the problem can be corrected so as to ensure the reproduction quality of the printed matter. In addition to the use of density as a parameter to reflect the color quality of prints, it is necessary to promote the CIE Lab color value of the color as a parameter for checking the print quality.
Every link must be managed by data, and every step must be tested by inspection tools. Otherwise, many mistakes will occur. Nowadays, with the continuous advancement of process technology, the color control means in printing have also been further developed. The new color management system makes printing color control easier and more effective.
SHANDONG CAIFENG INTERNATIONAL TRADING Co., Ltd. , https://www.zihcaifeng.com