There are color management calculations for 20 years. However, many times we still have some misunderstandings about color management: we think that with the color management system, we can solve all the printing quality problems; we think that we have the hardware and software related to color management. A successful color management system. The reality is that some companies have spent a lot of money to purchase all kinds of hardware and software, the color consistency problem in printing production is not well solved; some companies have spent the cost to make a color management system, no After a long time, the system failed and returned to the production state without color management.
Combining the actual production process and the problems that are easy to appear in the printing quality control, this article returns to several things that must be understood in color management to help companies clarify how to build an effective color management system for effective print quality control.
What can color management do?
The goal of color management is to pursue "what you see is what you get". Its working principle is to use the color conversion module (CMM) to bridge the source-space (ICC) between specific devices through a device-independent color space (PCS). Conversion of the target color space (ICC). For example, the color gamut of the printing machine is used as the source color space, and the color space of the inkjet printer is converted to realize digital proofing; for example, the color gamut of the printing machine is used as the source color space, and the color gamut space of the display is converted to realize the screen. Soft proofing.
The function realization of the color management system is divided into two levels, one is the color space data conversion level, which is completed by related software; the other is the physical level of color reproduction, such as the brightness value of each pixel of the display, the ink droplet size of the inkjet printer. And the number, the dot area ratio of each color of the printing plate, the density of each color ink, the dot gain value, and the like. Some of these physical quantity controls can be directly controlled by color management software to control the output of related devices, such as displays, inkjet printers, digital printers, etc.; some cannot be controlled by color management software, such as plate dot area ratio, ink density, dot enlargement Value, etc.
The result of the color space conversion data completed in the software is always stable, and the physical reproduction of the color is affected by the device, which is difficult to predict, which is the biggest difficulty in achieving stable color management. It should also be noted that the pros and cons of the "gain" results in "what you see is what you get" is not what the color management system can do, but the responsibility of the user.
What can color management do?
1. Due to the principle error, the color management system cannot achieve complete "what you see is what you get". Some typical examples are: the color gamut of a digital camera is larger than the printing color gamut. It is impossible to completely copy a digital photo completely. In the digital proofing system, although the color gamut of the inkjet printer is larger than the printing color gamut, the color space is Conversion is the use of LUT table for interpolation calculation. Because the interpolation algorithm itself has errors, digital proofing can not completely reproduce the printing result; the research on color psychological feeling in color science is still exploring, such as the color of the illuminant and reflector color. Feel how to unify and other issues, resulting in the current screen soft proofing accuracy is worse than the digital proofing accuracy.
2, color management can only solve the technical problems of accurate color transfer in printing, but can not solve the artistic problems in printing and copying. Since the color management system pursues the accurate conversion and transmission of color data in different color spaces, the system does not know whether a picture is color cast, whether it is high light, the dark mark is incorrect, the level distribution is not ideal, etc. problem.
3. Color management software cannot effectively control the output of all devices involved in color reproduction in print production. Today's digital printing devices are moving toward high levels of integration, such as electrostatics, electronic inks, inkjets, etc. These digital printing devices mostly integrate color management systems to make color control in printing simple. However, for traditional offset printing equipment, color management technology can not accurately control the CTP publishing network, and can not control the ink thickness, dot enlargement rate, etc., and these factors have the most direct impact on color reproduction. This requires the use of a quality inspection device such as a spectrophotometer to obtain dynamic quality control by obtaining color data in the printing production.
4. Color management has limitations on spot color control. The current color management technology is best at color reproduction based on CMYK four-color separation, and can not restore some special copying requirements, such as spot color gold, silver, pearl, UV and so on. In general, the color management system of the printing enterprise actually has a relationship between the total system and the subsystem. From digital camera input to printer output is a complete total system of enterprise color management, and there are some color management subsystems. Such as monitors, digital presses, etc. Most color management tutorials now focus on the transfer of color data between printing devices in each subsystem. Since the related software of the subsystem has the device calibration function, the color management is relatively simple, and the user can get good results according to the requirements. However, equipment for colorless management subsystems, such as CTP and printing presses, is often the place where problems occur, and the printing results are particularly affected. In actual production, these problems cannot be avoided.
How can we ensure the normal operation of the color management system?
A closed-loop controlled color management system involves printing equipment including digital cameras, displays, scanners, publishing equipment, proofing equipment and printing equipment, as well as production software such as PS, ID, CorelDraw, and process control software. Packaging and printing companies may also have complicated post-press processes, such as laminating, glazing, UV, hot stamping, etc. These processes have different effects on color results. We will not discuss the problems involved in the post-process.
At present, the color management software mainly includes screen soft proofing software, digital proofing software, digital printing machine color management system, ICC file making and editing software, and independent color gamut conversion software. The hardware for color management is mainly various measuring instruments such as spectrophotometer, density meter, plate measuring instrument and the like.
The above-mentioned software and equipment for printing production, software for color management, and instruments are provided by a plurality of manufacturers. In actual production, there are often problems such as the screen correction function in ProfileMaker software, and the screen correction software that comes with the professional image-level display can get better correction results; ProfileMaker has ICC file creation and editing functions, and Digital proofing is more inclined to use the software to generate ICC file function... In the face of a variety of software and hardware color management system integration problems, it is necessary to play their own advantages, but also to make the color data correct in each subsystem Passing is indeed a big problem.
Several problems need to be paid attention to when building enterprise color management system
There is also a technical management issue that is more prominent than the technology itself. At present, the technical work of most printing companies is relatively scattered, and the technical gods are assigned to different departments according to the process. For many reasons, technical problems often turn into interest disputes. For example, when there is a mismatch between the printing result and the proofing, the plate-making supervisor often thinks that the printing department did not seriously pursue the sample, and the printing supervisor will counter-attack that the sample provided by the plate-making department will not catch up, causing conflicts between the two sides. And the problem has not been resolved.
Similar technical management issues will cause companies to lose confidence in the color management system until the system of spending money is basically abandoned. Can this be anxious? To ensure that the color management system works properly, pay attention to the following points when doing system construction:
1. It is important to establish an independent technical team with independent color management as the core, and a technical team that has no direct affiliation with the production departments of each process. The team must have the ability to ensure the correct transmission of color data between the color management systems. Team members must master the key points and details of key technical aspects such as image processing technology, color management technology, output plate making technology, and printing technology.
2, the establishment of standardized, data-based technology management system standardization, data is the basic requirements for the stability of printing production, but also the prerequisites for the normal operation of the color management system. When there was a company that reflected the printing chase, there was always a large deviation in the partial chase of the magenta version. When the sheet was inspected, it was found that the magenta version had a serious partial vertical ghost, and further inspection found that the red color of the printing machine was The lining is about 20 filaments larger than normal. After correcting the lining, cleaning the dentition and re-flattening the teeth, the problem is solved. There are many similar examples, but these problems are not solved by the color management system, but have a great impact on the final printing results. Therefore, it is very important for printing companies to establish a standardized and data-based technology management system. Without these foundations, color management can only be a castle in the air.
3. Selecting suppliers with color management system integration capabilities Currently, most of the color management systems on the market are based on agent sales. Due to fierce competition, low profit margins make it difficult for agents to ensure a high level of service team construction. It also caused the company to buy a color management related system, but did not get good technical support and services, and sometimes it felt more difficult to live.
Source: Office Supplies News
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