Digital proofing and its application points
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Proofing is a key link between prepress and printing in the printing industry based on computer technology, network technology, new materials and complex processes. It is an important means of quality control and management in printing production, controlling printing quality and reducing printing. Risk and cost are extremely important. With the digitization of content expression and process control, the product cycle is decreasing, and the production efficiency is rapidly increasing. Therefore, the requirements for proofing technology for quality control and product inspection in the printing production process are getting higher and higher, and the emerging digital proofing is thus being carried out. Health, and began to provide relevant standards for printing, to provide users with quality standards or acceptance criteria for printed products.
First, digital proofing and its production process
Digital proofing refers to the new proofing technology that directly prints the color information of the page in accordance with the publishing and printing production standards and directly prints the color sample in the process of publishing and printing, based on the digital publishing and printing system, that is, directly outputting the printed proofs using the data-based originals. . It digitally uses a large-format printer to directly output proofs to replace the lengthy proofing process such as traditional film making and printing. The digital proofing system is generally composed of a color inkjet printer or a color laser printer, and the color proof and the color of the simulated proof are used to obtain a proof sample from the digitized original (electronic file).
1. Digital proofing system. The digital proofing system is based on the digital publishing and printing system (CIP3/CIP4). It uses the same page graphic information (RIP data) to reproduce color graphic information from computers and related equipment and software, and controls the quality of the printing production process. At present, the digital proofing system consists of two parts: digital proofing output device and digital proofing software. Digital color management and color control technology are used to achieve high fidelity to match the printing color gamut with the color gamut of digital proofing. Among them, digital proofing output equipment refers to any color printer that can be digitally output. For example, most of the large-format color inkjet printers that are currently used in China and can meet the requirements of publishing and printing; digital proofing control software is the core and key of digital proofing system. It mainly includes RIP, color management software, and large-scale software. It completes the digital screening of the page, the flattening of the page, the matching of the ink gamut and the printing ink gamut. As currently the most representative is the high-tech BlackMagic digital proofing system using true dot technology.
2. The process of digital proofing. The process of digital proofing is: receiving the page electronic file - RIP - digital proofing. The operation process includes: system setting - electronic file acceptance - spelling large version - selecting proofing material - digital proofing. Usually a set of four-color version of the digital proofing takes 15~30min, a good digital proofing software can control multiple digital proofing machines, so the production efficiency is very high.
Digital proofing is different from the traditional flat-press printing method of the proofer, and it is different from the printing method of the printing machine. It is based on the color range of the printed color and the same RIP data as the printed content. The large-volume color printing matches the printing method with small gamut space to reproduce the printing color, which can meet the requirements of various printing methods such as flat, concave, convex, soft, net, etc., and can make proofs according to the actual printing condition of the user. It solves the problem that the proofing and subsequent actual printing processes cannot match, which brings difficulties to printing.
3. The advantages and disadvantages of digital proofing. Compared with traditional proofing, digital proofing has the following advantages: 1 equipment investment is small, occupying a small area and low environmental requirements. 2 Saving human resources, reducing costs and expenses, and relying on the experience of operators is small. 3 fast speed, stable quality, repeatability and low cost. 4 Wide adaptability, especially suitable for direct plate making, gravure printing and flexo printing, etc., which can not be proofed or difficult to proof. It can simulate the effects of various printing methods, and can be combined with CTP (computer-to-plate) and digital printing machine digital equipment to truly realize the automated workflow.
At present, there are some shortcomings in the applicability of digital proofing compared with traditional proofing: 1 spot color proofing In addition to a few professional digital proofing systems such as Black-Magic, although the digital proofing system supports spot colors, it is actually using CMYK for spot colors. The four colors indicate a fixed spot color, which is not exactly the same as the spot color used for printing, and is similar to the ink color of the spot color in printing. 2 dot structure different except high surgery Black In addition to a few digital proofings with real dots, Magic basically uses FM dot or dotless dye sublimation technology, which is completely different from the traditional proofs of previous printing operators. It takes a while for the printing operator to adapt and accept digital proofing. the result of.
Second, the application points of digital proofing
At present, the digital proofing system has won the eager attention of the publishing and printing industry. Its product quality, production efficiency and ease of use are loved by professionals in the industry, showing a good development trend and application prospects. However, since the basic and application goals of digital proofing technology are not exactly the same as traditional proofing, in order to accurately understand digital proofing, the following application points must be noted:
1. Dot structure. The dot pattern structure used in the digital proofing method is not exactly the same as the traditional printed dot structure. The potential moiré fault in screen printing is difficult to detect. The printer must use the tone matching control method to check the print quality during the printing process instead of the traditional one. The dot structure matching method.
2. Color control method. The digital proofing system is different from the traditional proofing of color control by solid density and dot value. The color matching color control method is used to establish the printing color gamut and the color gamut of the printing, that is, the ICC is established.
Pro file. Can be matched to different printing methods, different printing materials and different production environments.
In short, digital proofing is an emerging technology and a key part of the modern digital printing process. In eliminating the influence of human factors and external factors, the stability of the proof output is greatly improved, the proofing process is shortened, and the proofing cost is reduced. As an important part of the digitalization of the printing process, digital proofing determines that the future proofing must use digital proofing technology and eliminate traditional proofing, which has become an inevitable development trend of the printing industry.