Color management is a very hot concept at present. I can often hear some manufacturers saying that they need a full set of color management equipment. It seems that as long as the equipment is bought, everything will be solved; some even think that they have bought a printer and a better display You can do color management well. In the understanding of color management, many manufacturers have some misunderstandings, it is necessary to discuss printing color management with you.
What is printing color management? There are many explanations at present. The summary is a system that tries to keep the color consistent throughout the printing process from image creation, input, processing to final output. Color management first points out the color perception expressed by RGB and CMYK values ​​(represented by device-independent L *, a *, b * values ​​or other values), and then ensures that these data are maintained when passing between different devices, maintaining the color perception Consistent.
Printing color management has become more and more important in the printing field, because printing color management can help solve the problem of reproducibility and consistency in color reproduction faster and better, so it is an inevitable choice for printing companies with high quality and high efficiency.
From the aspect of printing color quality, good color management companies have detailed digital records and a set of process parameters for each customer's color requirements, which can be well controlled in any link, so that the final output The color can meet the needs of customers very well; but the color management is not good, companies, the quality of the printed color is uneven, often because the color is unqualified and re-ordered, or even reprinted, causing huge losses.
In terms of the efficiency of printing color control, good color management companies have greatly reduced the number of anti-copying, repeated proofing, and repeated printing, greatly shortening the entire process from proofing to pre-press preparation to final printing. What is valuable is that even if a problem occurs in the process, the problematic link can be found in the fastest time and resolved at the fastest speed, thereby greatly improving the efficiency of printing production. Manufacturers with poor color management have to keep experimenting and making proofs in the early stages of color restoration. Because of the poor standardization and data in the production process, they often find out where the problem lies, and even appear to be responsible. The phenomenon, low productivity, has an adverse effect on the production of the entire enterprise.
In recent years, printing color management has developed greatly in China. On the one hand, everyone has increasingly increased color requirements and shorter delivery times. Color management provides a good solution for the majority of users. Many companies are in color management. I have tasted the sweetness in it; but on the other hand, many companies have insufficient understanding and understanding of color management, which has led to some misunderstandings. In addition, color management involves many factors and variables, and the parameters are very complicated. Standardization, so it is not simply a problem that can be solved by buying a few devices and buying a few software. It also requires strong color management technology as a support. Many manufacturers have not yet reached but are approaching in this direction, so the current color management The application is not yet full, and the maximum energy of color management has not been exerted, but I believe that with the further transformation of the concept of the majority of manufacturers and more exploration and exchange in print color management, its prospects will be very broad.
Many users will think of monitor calibration for pre-press color management whenever they talk about printing color management, making ICC characteristic files or digital proofs for monitors, scanners, digital cameras, etc. In fact, pre-press color management is only a part of printing color management. But pre-press color management should be distinguished from digital image color management.
For example, if the user is a photography enthusiast, his request is to see the image he has taken on the display and the color seen on his inkjet printer or laser printer are basically the same, or he needs to be digital The color of the photo produced by the printing machine is basically the same. We can think of this as color management for digital imaging, and the output device characteristic file generation is mainly of RGB type.
The pre-press color management is mainly for the management of the final color output for printing purposes. It generally includes the correction and color management of monitors, scanners (or digital cameras), printers (usually with RIP or used with digital proofing software), It is also part of printing color management. The output device characteristic file generation of printing color management is mainly CMYK type. The following figure is the whole process of printing color management, among which â‘ â‘¡â‘¢ is pre-press color management.
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In addition to the various traditional input, display, and output device corrections, and the production, application, and conversion of characteristic files, the printing color management process also includes color quality management of films, printing plates, and printed materials. The entire process is a system that requires system solutions and the digitization and standardization of the entire printing process. [next]
Printing color management solutions:
â‘ Input device calibration and characteristic file generation: Including scanner, digital camera and other input device calibration and ICC file generation. Eye-One Photo, Eye-One Proof, Eye-One XT, etc. can be produced.
â‘¡ Screen correction and characteristic file generation: Eye-One complete set of products can basically correct and produce characteristic files for CRT and LCD displays (PC or MAC). Among them, Eye-One Display2 and above can also measure the color temperature and color rendering index of ambient light, which is a powerful tool for ambient light detection. In addition, Eye-One XT can also make ICC characteristic files for the projector.
â‘¢ Output device calibration and characteristic file generation: Among them, Eye-One Proof, Eye-One XT and other devices can make ICC characteristic files of output devices such as printers and printing machines, and their hardware can also be connected to most RIP software and color management software. Linearize the output device. The new product Eye-One Isis can scan color blocks at high speed, and 1500 color blocks can be read in only 4 minutes, which can meet the needs of printing users to frequently produce a large number of printed ICC characteristic files. In addition, Eye-One IO scanning platform can be connected to Eye-One Pro hardware to speed up the scanning speed and completely liberate both hands. The thickness of the scanning medium can reach 10mm, which is an ideal solution for the production of ICC files with slightly thicker media.
In addition, ProfilerMaker software is a more advanced color management software. In addition to making ICC characteristic files of all links, you can also match the effects of different displays, you can customize the color table to make ICC files, and also allow users to apply Customize editing of ICC characteristic files based on your own special requirements for color.
④ Film density dot measurement: For the traditional pre-press, the quality of film production is directly related to the printing level and color reproduction. Generally, we recommend using 341 portable or 361T desktop transmission densitometer to control the density and dot, for example, to control the field density 3.8 -4.2 helps to control that the small dots are not lost when printing; in addition, the linearization of the imagesetter needs to measure the dot area of ​​each stage to help correct the imagesetter.
⑤ Printing plate measurement: Whether it is traditional pre-press or more and more users are currently using CTP to directly make plates, the quality of the printing plate dots is very important. For the traditional pre-press, you can check whether there is any loss or defects in the printing from the film to the printing plate , Whether the restoration of the outlet is correct; for CTP users, it is necessary to correct the CTP plate-making equipment according to the printing characteristics. Relevant measuring instruments currently include ICPlateⅡ and PlateScope. ICPlateⅡ Advanced Edition can measure parameters such as FM and AM dots, the number of screen lines and the screen angle; In addition to measuring FM and AM dots, PlateScope can also measure mixed dots, and all Type plate.
â‘¥ Color Matching: For some packaging printing users and some commercial printing users with more spot colors, high-efficiency and high-quality color matching is an important link for spot color printing, and it is also an easily overlooked link in printing color management. The traditional color matching is strong in randomness, and most of them judge whether it is qualified through visual inspection. It is very error-prone and leads to waste of ink and paper. Even after spending a lot of time, it is impossible to match the ideal color. In recent years, many users have used computer color matching systems for ink spot color matching. The first color matching is faster. There is no need to test many times to avoid ink waste and reduce ink inventory. More importantly, the remaining ink can be used in the next color matching. The purpose of cost saving. But if you want to run the computer color matching system well, you need to make the ink database strictly, otherwise the expected results will not be achieved, because all the data of the computer color matching can be stored in the computer software, and the special color printing with the printing factory can be printed and turned over Waiting will be of great help. Related products include FM and IFS color matching software and related hardware.
⑦ Print product inspection: Many printing companies have paid more attention to this aspect, which mainly controls the density, dot, overprint, contrast, color difference, etc. of the printed ink. How to measure each specific parameter and how to apply it will not be repeated for space reasons. Emphasize several points that are easily overlooked by users: First, we must give full play to the maximum function of spectrodensitometers and other measurement products. It is strongly recommended to place measurement control strips during pre-press production, otherwise many related parameters will not be measured. This point is emphasized because many printers have been visited. Many manufacturers are reluctant to place measurement and control strips, and feel that the paper cost will increase when they occupy paper space. However, if this cost is less than the loss due to the color sample not meeting customer requirements, it is not enough mentioned. The premise of printing color management is printing data and standardization, and there is no measurement and control strip. It is impossible to talk about color management. In addition, when making the printing machine characteristic file, it is not ok to print the color block casually. Many users have seen that the printing color block is completely based on the feeling. Without any measurement and recording, the sample sheet is used as the characteristic file. This method It is definitely inappropriate. Before making the printing characteristic curve, you need to adjust the printing density and other parameters to the ideal state, and you must make a record. This color management is effective. More manufacturers of printing machines also need to Average the color management profile of the printing press. Related instruments include 500 series, SpectroEye, 939 and other spectrodensitometers. It is worth mentioning here is the ITX automatic scanning spectrophotometer, the scanning speed is very fast, only 15 seconds to complete the folio scanning time, which won time for online ink control.
⑧ Finished product color quality inspection: At present, many printing companies separately divide the product inspection department to complete, the traditional method uses the upper and lower limit color sample visual method, but with the continuous improvement of customer requirements and the trend of digitalization and standardization in the printing industry, spectrophotometry is required. Instrumentation, density meter and other measuring instruments to detect whether the color of the finished product meets customer requirements, and sometimes even need a special color test report during inspection. Now many large and medium-sized end customers and many printing manufacturers have their own product quality system and a set of methods for color control. Generally need to use spectrometer plus quality control software to help achieve, such as 530 spectrodensitometer + QA software.
The color management of the printing process is a system, and its establishment is also a gradual process, which also has certain requirements for printing companies:
First of all, it is very important to do printing data and standardization, which is very important, including the production of film, the recording of the process parameters of the printing plate and the strict control of the process, as well as the process records of the pressure, speed, ink, paper and other factors during printing. In addition, the records of printing density, dots and other parameters during printing, and the formulation of corresponding standards, etc., need to be completed.
Secondly, we should analyze the current enterprise situation, make a reasonable investment, and choose color management hardware and software with better cost performance. You can consider pre-press color management first, and avoid greed and perfection. In the absence of adequate color management technical support, blindly purchasing hardware for printing color management will only lead to indigestion and waste of resources.
Thirdly, a group of technical backbones who understand color management and standardization should be cultivated in the enterprise, because printing color management involves knowledge in design, pre-press, printing and other aspects. In general, it is also very important to train talents who can control the color management process.
Finally, printing color management is a system that cannot be achieved overnight. It requires printing companies to formulate rigorous printing processes so that every link of production has data and standards to check. Although it will encounter setbacks and difficulties in the early stage, once the printing color management system is established step by step, the printing enterprise will definitely stand out in today's highly competitive printing market.
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