Editor's note: The successful implementation of color management not only requires printing companies to introduce advanced tools, but also requires users to have the ability to use and manage these companies.
Harmonized standards
In view of such a wide range of industry standards, the success of a proofing workflow depends mainly on the determination of a unified standard and the degree to which each procedure in the workflow matches this standard.
In the global printing market, different printing plants may adopt different standards and working methods. In the same way, people can also create printed content according to different standards. An article written three years ago may be printed according to one standard; a magazine may be designed according to another standard; an advertising agency may create its own advertisement according to the third standard ; And a printing house may use the fourth standard for printing. Whether it is a recognized standard, an unofficial standard or an internal standard, you must have the ability to deal with it. So how do you manage them?
The best way to solve this problem is to transfer the file to your own color space and make proofs according to the target space. For example, if the standard you obtained is in compliance with the SWOP standard, but you find that the colors printed by the magenta unit of the printing press are insufficient, you can make up for this difference by adjusting the print file of this unit. Your original proof (before the color conversion) reflects the lack of magenta. The converted file shows the final effect after correction.
Let the standard work: Connect the device to the characterization description file.
If you want to output the same file on two different proofing systems, the only reliable way is to calibrate, edit and test the two systems separately. Imagine each manufacturer's printer driver for different models and determine how it came to the printing plant after leaving the factory. During the installation of the system, each printer should be recalibrated in accordance with recognized standards. Therefore, even if a clear color standard or proofing target is not found, the system can cooperate well.
The operator should print test samples regularly and measure them with a spectrophotometer in order to find problems in the system and correct them in time. This must be done anyway. All equipment should be adjusted to the same standard state, so that their performance can be consistent, and the accuracy and repeatability of the production process are guaranteed.
However, this method also cuts off the connection between the calibration of the digital printer and the characterization of the printing press. For each given ink / paper / printing condition, the printer must create a characterization description file or go through a characterization test process. As long as the characteristic files of one printing machine are changed, it means that the characteristic files of all printing machines / printers in the same network must be modified, and it will adversely affect the final printing effect. Therefore, it is generally believed that this is a high-risk / high-input / low-return correction method.
Create an independent printer characterization file and use the same printer characterization description file for all printers to ensure that the printer is always consistent with the color space when the characterization file is created. Therefore, as long as the same paper, ink and setting parameters are used, any inkjet printer belonging to the same printer family can be matched with other printers anytime, anywhere. Remember: The accuracy and repeatability of the entire proofing system is directly related to the quality of the consumables and the consistency of the operation. Therefore, the key is to calibrate the equipment frequently and use the best substrates and inks as possible And technical service personnel.
When using a decentralized device characterization solution, the remote terminal only needs to receive the printer's characterization description file and ensure that the output device is always within a specific tolerance range.
This correction method enables the proofing system to present the same color effect at different locations. If you want to obtain the same (very close tolerance) proofing effect over a long period of time, or enable printing systems in different places to achieve accurate color reproduction, then mastering this correction method is the most important.
If the printing house can clearly distinguish the calibration, characterization testing and editing procedures of the proofing system while adopting the industry standards, then there is no need for them to introduce color management experts. If you need to use customized printing machine characterization description files, it is necessary for color management experts to generate an optimized color characterization description file. In the case of remote proofing, this feature file can be sent to all remote locations, greatly simplifying the process of achieving and maintaining color consistency.
In view of the above requirements and the problems in the actual use of the proofing system, especially the remote proofing system, many potential remote proofing users have no courage to try. They are afraid of operating "complex" measuring instruments, unwilling to face the pressure of calibrating output devices and creating complex characterization description files. All this hinders the popularization of the remote proofing system in the printing industry. Fortunately, the continuous advancement of technology has gradually eliminated these obstacles. [next]
The Designjet Z2100 digital printer introduced by HP has redefined remote proofing. With the support of the built-in spectrophotometer, it can automatically perform remote calibration procedures. In addition, as long as enough network bandwidth is provided, this printer can be used as a stand-alone device in a remote location-no need to connect to a local computer and an external spectrophotometer. And because its built-in spectrophotometer can detect each sample, this digital printer can also save users a lot of equipment and labor costs. In summary, the Designjet Z2100 digital printer is a very proofing solution worth considering.
The advantages of this system are: it is a complete solution; every sample produced is a high-quality contract proofing; it can be repeatedly proofed on any HP Designjet Z2100 printer anytime, anywhere; the user does not have color management In the case of knowledge, it is also easy to produce proofs that meet industry standards; fewer wrong proofs are printed, which can reduce the labor and material costs of proofing and increase customer satisfaction.
In the past, to calibrate a printer at a remote location, the user had to purchase a proofing program or print a test sample with the host system and send it back to the host company's office for measurement. If you want to improve the repeatability of the proofing system, you must not miss any mistakes. If there is a correction error, not only will it waste valuable real time in production, but it will also hurt the user's confidence. That being the case, why should remote proofing users purchase a proofing program specifically to calibrate a remote digital printer?
The new HP printing device is a color management proofing solution that allows users in remote locations to calibrate their digital printers without purchasing or installing color proofing programs. With the help of a built-in spectrophotometer, this host software system can do all the work.
Color conversion
In today's American market, most printing houses do not produce according to industry standards. Because of this, it becomes very difficult to prepare and print proofs in accordance with the color space of the printing press, unless you know on which printing press this job will be printed and can obtain the Characterization description file.
Another method is that the printing presses are printed according to the same standard, and then all printed documents are prepared according to this standard. However, we all know that each printing press has its own characteristics, so this is not an ideal solution. Are you willing to produce a proof that meets the standard, and then give it to the printing press operator for color matching, or are you willing to create a proof color space suitable for all printing presses?
In fact, neither of the aforementioned two is the best option. The best solution is to create a standard color space for editing and storing printed files, and then use the color conversion tool after fully considering the characteristics of the output device Optimize printed documents.
However, many color conversion and characterization tools cannot actually convert colors accurately. Their commonly used three-dimensional color spaces (such as CIE, LAB, and LUV) lack information about the black (fourth color) channel, and this information happens to be necessary to achieve accurate color conversion.
An excellent color management system can transfer CMYK data from one standard-either an industry standard such as GRACoL or ISO, or an internal standard-to another industry or internal standard, while retaining the black channel Characteristics and integrity of original data. This allows users to standardize the different image data received according to a unified standard. For the same reason, they can also optimize the output data to make it suitable for different output processes, printing processes and printing conditions. The color space of a printing job together with its specific requirements for the printing process, printing press, ink and paper can be transferred to another color space at any time, and accurate colors can be reproduced under completely different printing conditions. For example, SWOP offset printing data can be automatically converted into PSR gravure printing data; an offset printing job can be converted into a laser color printing job; a Powerpoint presentation file can also be converted into a point-of-sale advertisement.
to sum up
The purpose of proofing and color management is to enable proofers and printing presses to achieve accurate and repeatable printing production. To achieve this goal, people must design and implement a set of feasible solutions that can meet the actual needs of the proofing workflow. In addition, we can evaluate the quality of a proofing system from the perspective of accuracy, repeatability, and total cost of ownership.
Distinguishing the characterization description files of printers and printers helps reduce the time to match proofs between multiple sites. The emergence of new equipment can not only further improve the automation level of the proofing program, but also enable remote proofing to be accepted by more users without color knowledge or experience.
For printing houses and prepress experts, color standards are both an opportunity and a challenge. Because there are many standards in the industry, users must face the problem of color space conversion. Fortunately, there are many new tools that can simplify the proofing process and improve the effect of cross-standard.
In the final analysis, the purpose of proofing is to transfer colors to the page.
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