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Prepress color management technology
Jul 30, 2018

Prepress color management technology

Many color management software used by traditional printing companies, although the name is color management software, is essentially just a digital proofing software. In other words, these softwares do not require the cooperation of third-party software, and can only complete the digital proofing color management work inside the printing enterprise. In the prepress process, printing companies not only need such a digital proofing software, but also a set of true color management software, which should be a device color relationship management system. Color management under the concept of large prepress is much more complicated than pure color management of offset presses. Generally, only the printing company of the offset printing machine, as long as the offset printing machine is stable, and then the printer is standardized by the digital proofing software, so that the color data of the offset printing machine and the printer directly correspond to each other, and the color management can be basically satisfied.


    But the real problem is that with the continuous improvement of customer requirements, more and more traditional offset printing companies have higher requirements for color management, especially when they have both digital printing business and traditional printing business. It started to get difficult. So they have a strong interest in color standardization and began to be keen on G7, PSO and other process certification. Many suppliers, such as Founder and Jinlian, have also organized technical personnel to participate in training to provide process certification services for printing companies. Process certification has become a hot spot for printing companies.


    Usually, to achieve these standards, the first thing to do is to change the company's own specifications and standards, and approach these international standards, such as standard inks, standard paper and blankets. Of course, the change of these consumables is relatively simple. As long as the money is spent, the supplier can basically solve it. Hardware changes are easy, software changes, changes in old worker habits, and the creation of new operating habits are the hardest parts. Therefore, for process certification, it is not possible to print a standard proof. Printing standard proofs is actually the easiest step in the certification process. The most difficult thing is that the company must establish all the standardized operation records in a certain period of time, and let the company continue the "standard"! It is difficult to achieve the accumulation of these job records without the accumulation of time and the practice of standardizing the habits of employees.


    So, is it only by changing the original normative standards of your own company that you can pass the certification? In fact, both G7 and PSO are based on the ISO12647 standard, but these two certified correction control schemes have some shortcomings and shortcomings. The PSO based on TVI control lacks the control method of gray balance, so that in the implementation, the whole gray balance tone may be unbalanced.


    Fortunately, ISO is also correcting this problem, and released the latest ISOTS10128 standard, which incorporates both TVI and gray balance correction schemes into the standard system, and adds a set of uses for the shortcomings of the above methods. CMYK-CMYK conversion standard, that is, DeviceLink color space conversion. The introduction of this standard has enabled some companies to adapt their printing conditions to some international standard color gamut by CMYK-CMYK color space conversion, which is undoubtedly a big improvement.


    In fact, if the printing conditions of the company are stable and the color gamut is large enough, there is no need to force yourself to use the so-called standard inks in order to make your printed products meet more standard colors, or to change the process standards of its own equipment and employees. Operating habits.


    The author believes that the emergence of the ISOTS10128 standard has led to a more convenient and efficient management solution for some enterprises that have both traditional printing services and digital printing services. At present, there is already corresponding software on the market, such as GMG's Colorserver. The application of this software is a printing company with diverse equipment and complex color conversion relationships. That is to say, in a printing house, whether printing on an electrostatic digital press, printing on an inkjet printer, or printing on a conventional offset press, the final print can meet the same color standard.