Understanding of Digital Proofing in Traditional Printing Color Management

Once upon a time, when customers sent samples to the printing house, they repeatedly told them to ensure that the overprint was accurate. As a result, due to paper absorption or mechanical reasons, some printed products were still slightly inferior; Color printing. Accurate overprinting is a basic requirement for customers to accept printed products, and color is the focus of customers. Color is one of the methods consumers use to distinguish between genuine and fake products, and it is also the wealth of customers. Color management has become very important.

The supply of low-end prints exceeds demand, and high-quality prints have the lure of lucrative profits. Whoever masters color management has the market for high-end printed materials.

Due to the popularity of four-color and multi-color offset presses, coupled with the application of an alcohol dampening system and waterless offset printing, accurate overprinting is no longer a problem. However, the problem of how to accurately restore the colors made the captains difficult, and at the same time it caused headaches for technical managers. High-quality production management and printing process standardization, standardization, and dataization were known to us 10 years ago, but they are similar in water and difficult to implement. The popularization of the service concept in the first place, reluctance to use digital proofing instead of traditional proofing has gradually become popular, coupled with the broad development prospects of CTP, digital proofing system and comprehensive management have attracted increasing attention.

In digital proofing, the most important thing is the predictable printing color, imitating the printed material's simulation dot. Customers provide color inkjet proofs and corresponding digital files, the application of image graphics software, printers, inks and other aspects are different, so the parameters of digital files must be adjusted and corrected. Digital proofing is a system that replaces traditional proofing, and its software and hardware are relatively fixed (including consumables) and cannot be replaced at will, otherwise its value will be greatly reduced.

In order to match the actual process conditions, the pre-press digital proofing technology is open and modifiable. There are many factors that affect color reproduction. Leaving aside the actual printing equipment, the stability and manageability of pre-press digital proofing do not have to be dialectal in importance.

How to narrow the gap between digital proofing and the final printed matter is the most concern of users. Digital proofing system integrators provide users with many printing characteristics ICC files, and these files are not from the user's own printing machine, so the optimization of ICC files is essential, easy to use, friendly ICC file creation interface, naturally users One of the important basis for purchasing system.

Secondly, the formulation of ICC files is often based on the data collected by the color density meter and the spectrophotometer, which is greatly affected by the light source. I personally think that the percentage of outlets should be the main target of the collection, supplemented by the necessary control of the density value on the ground. It will be more practical to make ICC files for printing machines or printers in this way, because the color of the printed matter is expressed by the percentage of the dot, and it is also affected by the inherent color of the light source and the printing material. The related digital proofing system has a similar concept.

With the emergence of true dot proofing technology and related software and hardware, dot measurement and control strips are used to automatically compare digital proofing with printed matter, generate or modify digital proofing ICC files, and eventually make digital proofing and printed matter consistent. By simulating the actual printing conditions (ink, paper, printing equipment, production site environment) experimental production, to produce a limited number of time-sensitive digital proofing ICC files, to achieve the purpose of simulating printing colors.

The digital proofing system will undoubtedly find a breakthrough for the application of color management in proofing. Of course, comprehensive color management should also include pre-press and printed color control. Only when the printing process is standardized and managed digitally can comprehensive management be supported in a larger environment.

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