Exploration of the most popular open color managem

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Exploration of open color management

key words: image processing color management prepress

the 20th century has created a brilliant future for digital technology. In the printing field, graphic information (optical information) is processed and converted into data, and then transferred from data to graphic information, showing a new digital printing production process. The transfer or transmission of graphic information is open and all-round, completely free from the restrictions of distance and industry. This is the inevitable result of the wide application of digital technology in the printing field

at present, the reality of the color reproduction industry is that printing enterprises, publishing houses, newspapers, magazines, advertising companies, graphic production companies, designers, and other professionals, and even those enterprises and institutions that often need advertising and changing product packaging are using graphene, a material stronger than carbon fiber. Computers process graphics and texts, output photosensitive films, and then print in local printing plants. Graphic processing is no longer limited to the printing industry (including graphic production companies). There are fewer and fewer production methods for printing enterprises to process pictures and texts by themselves, print by themselves or process pictures and texts by professional picture and text production companies. Image and text processing has become an open industry in the whole society

therefore, the traditional quality management mode, that is, according to the printing conditions of the enterprise (the graphic production company is generally a fixed proofing condition), under the premise of standardized operation, using test tools, repeatedly test and determine the accuracy of printing machinery, the performance of printing materials, etc., and take this as the basis for various image processing, The management mode of making the printing plate produced by the output image information meet the printing suitability requirements of the printing enterprise, and finally making the printed matter achieve a better reproduction effect has been unable to face a completely open image processing system

currently, all image scanning and color separation equipment manufacturing companies and software development companies have launched corresponding color management software. For example, the professional scanning and color separation equipment of "Duoba" series is equipped with excellent color management software. Another example is the color management software recently developed by XX company, which can ensure that the original image color → the image color displayed on the display → the image color of inkjet proofing is basically consistent with the image color reproduced by the traditional mechanical ink. Although these color management software is quite perfect, it is not an individual

according to the current production process of image processing, the software must face countless printing enterprises. When digital technology is widely used in the printing field and the long-distance transmission of graphic information becomes a reality, the printing press has actually become an output device of the graphic processing system. However, the current situation of China's printing industry is that the printing conditions vary greatly. When the printing plates produced after image processing are printed by printing enterprises under various printing conditions, the errors of level and color reproduction are inevitable, and the reproduction effect of printed matter is impossible to be ideal

for example, the difference of the expanded value in the point transmission process of each printing plant leads to the error of hierarchical reproduction. The processed image is printed in a printing plant, and the level of image reproduction is ideal, while in B printing plant, the effect of image level reproduction may be very poor. Similarly, because the gray balance data of each printing factory is inconsistent, the gray balance data input by the color management software can not guarantee that each printing factory can achieve the correct reproduction of color

when printing, the printing ink layer of three primary colors can only be adjusted to achieve neutral gray balance again. This adjustment is bound to increase the printing difficulty and affect the production efficiency, and it is not necessarily able to keep the neutral gray balance of the three primary color combinations of each density step. Eventually, the color effect of the printed image and the color of the original image will still be significantly different from the image color displayed on the display screen during image processing

therefore, in the face of printing enterprises with different printing conditions, the color management software of graphic processing must modify or adjust the relevant data in order to compensate for the hierarchy and color errors in the process of image information transfer under a specific condition. But the crux of the problem is that every individual processing graphic information, whether publishing houses, large advertising companies, professional graphic production companies or various professionals, is in a blind state when using color management software. Because the above individuals can not get the final image output (printing) unit at all, which can ensure the correct reproduction of image levels and colors, as well as all kinds of original data in line with the printability of the unit

at present, the color management software can only be limited to a fixed proofing device (mechanical ink proofing or color inkjet proofing) as an output terminal to manage, so as to obtain satisfactory image levels and color reproduction effects. No matter how comprehensive and accurate the design of the software is, the relevant data of the final output (printing) unit of different printing conditions that must be set by the color management software cannot be obtained. Therefore, the color management software designed by image scanning equipment manufacturing companies or software development companies is still a closed management software, which can only manage the color of a specific output unit

the author believes that only when the color management software is combined with the Internet, when the relevant original data of each output (printing) unit is obtained through the Internet, adjusted and processed accordingly, and served each output (printing) unit, can the color management software achieve real personalization. Color management system can truly become an open management system, and ensure the improvement and stability of the quality of printed matter in the whole society. The specific scheme is as follows:

1 Test the original data of each printing enterprise

use the test original made in a unified way, print and obtain the relevant data to ensure the correct reproduction of image levels and colors in the printing process on the premise of relatively fixed printing conditions. The main contents of the test: hierarchical and colorful images (as the basis for intuitive evaluation of replication effect), gray balance test chart, reflection and transmission neutral gray scale, color color meter, etc. Test data: the neutral gray balance data (point percentage area value) of the three primary colors of each step, the change data of each step point in the transmission process, that is, the difference between the percentage area value of each step point of the printed matter and the percentage area value of the corresponding step point of the test original, the percentage area value of the three primary colors of each series of colors or the point combined with black, The achromatic structure quantity of achromatic structure process (ICR) or grey substitution process (GCR) and the percentage area value of equal points of each step of the corresponding black version, such as rubber fatigue testing machine, etc. The test can be organized in a unified way, using a unified test original, conducted in a decentralized manner, classified centrally, and marked with the name and model of the paper and ink used

2. Many enterprises are optimistic about the downstream demand for color management stations

some will be many times higher. Authoritative institutions such as China or regional printing associations, printing technology research institutes, printing or graphic information magazines with certain influence, etc. use the Internet to organize and establish color management stations. Manage the original data determined by each printing unit after testing, including the adjustment and modification of the original data when the printing conditions change. All data information is released by the color management station through interconnection

3. Data information inquiry

color management station can implement membership management. All units and relevant professionals registered to participate in the printing, graphic production, publishing houses, advertising companies, magazines and other graphic information processing of the color management station have the right to query the original data of the printing enterprise through the Internet. The required data is sent by the professional management personnel of the color management station, and the query units and individuals cannot directly click to obtain the relevant data. In this way, it can not only realize resource sharing, but also have a certain degree of confidentiality. Specific articles of association can be formulated in detail

4. Color management and image processing based on the original data

when image processing, modify the relevant data of the color management software based on the original data of the printing enterprise queried on the Internet. Or based on the original data, the image is processed by hierarchical adjustment, color correction, etc., and the background color removal and achromatic structure technology are correctly and reasonably applied. Ensure that the processed image information displayed on the color display screen is basically consistent with the final reproduced image of the printed matter produced by each printing plant, so that the printed matter produced by each printing plant can maintain the best image reproduction effect relatively stably. (lixinghua, publishing School of Hangzhou Institute of Electronic Technology)

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