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Second, the choice of digital proofing Digital proofing can basically be divided into three categories:
DESIGN PROOF design proofing, only for layout design;
COLOR PROOF Color proofing for color effects;
SCREEN PROOF dot proofing, at the same time for color and dot effect.
Overall, COLOR PROOF's color proofing is most versatile and highly selective to achieve the best cost-effectiveness.
In fact, there are many types of color printers available on the market. The main imaging technologies include: laser printing, thermal wax transfer, thermal sublimation, and inkjet. The inkjet type can be regarded as a mainstream medium-to-high end product.
1. Digital Proofing Hardware Introduction Thermal Transfer Technology: This technology uses a wax block containing pigments to transfer graphics to special paper. However, the color space covered by this technology is different from the traditional offset color space. The use of heat transfer technology for proofs rough appearance, the resulting network and printed halftone dots are also inconsistent, commonly used for pre-proofing, equipment investment is about 8,000 US dollars, each time printing costs about 3 US dollars.
Sublimation Technology: The proofing system with sublimation technology uses a printhead containing thousands of heating elements and a color strip containing CMYK pigments for proofing. The print head produces 256 different levels of heat, allowing the solid pigment to sublimate into steam and condense on the receiving medium. At the center of each point is a darker color with lighter edges. When the four printing colors are printed, the four colors merge with each other to form a borderline image. The average set of such equipment is about $25,000, and the cost per print is about $7.
Inkjet Technology: A (premium) inkjet sample system is an image formed by ejecting ink onto paper. Although the paper is inherently lower than heat, the entire system is more expensive and requires more maintenance. The price is between $44,500 and $69,000. Each print costs about 2-3 US dollars.
Laser technology: This technology has high precision and can produce halftone dots, and the specific technologies used are different. System accuracy reaches 1800DPI to 4000DPI. Equipment sales is about 20-277,000 US dollars. Each of these proofing systems costs about $15 per sample.
The proper printer only provides hardware features. The key to the whole set of proofing system is the color management software CMS. In the topic of digital proofing, you often come into contact with a term to "ICC PROFILE", which is actually a data file with a standard format used to record the unique color gamut of different color output devices. The application of "ICC PROFILE" within the digital proofing system is just a common procedure. The most important thing for the user to understand is how to generate some data, which depends entirely on the software functions of individual manufacturers. In general, professional software can make different grades of printers perform their best color simulation capabilities.
2. Software Introduction Each device has its own gamut space. Some colors can be seen on the screen but cannot be represented by the output device. This is because the gamut space of the screen and the output device are inconsistent. Agfa CMS can connect and match two gamut spaces to solve the problem of color conversion. When using a process color to simulate a screen color, one approach is to remove the incapable hue and express it in the closest color to the printed color space. Another method is to reduce the screen gamut space to print gamut space, so that the entire surrounding environment changes color, use the relationship between the eyes and the brain to simulate the effect between different color gamut. It can be seen that the latter is a better way to make all color output devices have a certain color simulation capabilities.
Third, the application of digital proofing The existing digital proofing technology has been able to meet the vast majority of mid-range users. They mainly seek speed, stability and cost. In these three areas, digital proofing is obviously much better than traditional proofing. A total of user engagements include publishers of general books, magazines, and textbooks.
For high-end users, it is clear that the above three advantages do not fully meet their needs. And color quality is the most important requirement. It is precisely because of the stringent requirements of these users that a layout often needs to be modified several times in the production process, and many users of this type, such as advertising companies, begin to use digital proofing to make a TEST PROOF proof. Digital proofing has been used during the revision process until a modification is made and a traditional proofing is performed. This alone can save a lot of costs that require repeated proofing.
After all, is digital proofing mature? How should we choose equipment? In fact, different users will have different answers, depending on the importance of each feature of the proofing described above to individual users. Figure 3 shows an intuitive way to compare the results of current digital proofing and traditional proofing in a high-end printing plant and a short-run quick printing plant.
The above introduction hopes to provide some useful reference for everyone. The last thing to be pointed out is that today's digital proofing technology has reached a certain degree of practicality, but users must pay attention to the cooperation of software and hardware when selecting equipment, so as to achieve the desired effect. 
Digital proofing (below)
Multiple format capabilities: In addition to simulating the color effects of an output medium, the digital proofing system can also automatically adjust the color of the images in the file in accordance with the needs of different outputs so that operators do not need to manually modify them. Automated workflow. The characteristics of the above two digital proofs are all lacking in traditional proofing.