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Compared with traditional proofing, color digital proofing has many technical advantages:
1. high speed. It can directly output the layout produced by the computer, which reduces the intermediate links of traditional proofing, such as filming, printing, and developing. It can get proofs in a short period of time to improve the production efficiency and meet the time requirements of customers.
2. low cost. Since the proofing can be done before the film is taken out, the consumption of the film and the printing plate is reduced, and even if it needs to be modified, it will not cause too much loss.
3. Small investment. Compared with traditional proofing equipment, digital proofing equipment investment is much lower.
4. Simple operation and strong consistency. The process of digital proofing is completely controlled by computers. There are few human interventions. Only initial settings and periodic adjustments are required. Printing in accordance with the prescribed method ensures that the proofs are completely identical. While traditional proofing is affected by many human factors such as printing, development, inking, and Sheung Shui, it is difficult to ensure the consistency of each sample even if it is the proof of the same batch. The operator's operating level requires high standards. .
5. It is especially suitable for use with processes such as direct plate making, gravure printing and flexo printing that cannot be proofed or easily proofed. Direct platemaking can not use the traditional proofing, gravure printing and flexographic printing methods because of the lack of film, so it is difficult to proof the printing methods. The digital proofing method provides a solution.
Digital color proofing technology has so many advantages. Why hasn't it been promoted in China for so many years? The reason is nothing more than the following two aspects:
The first is the concept and understanding of the reasons, that the digital proofing and printing methods are different, special paper and ink, printing and use of paper and ink is very different, it is difficult to replace, worried that customers and printers do not recognize. In fact, the above differences do exist. Color digital data sampling usually uses jitter screening technology, which is different from traditional prints in the micro network structure, but there are no major differences between macro colors and hierarchical effects. From a coloristic point of view, as long as the colors feel the same color, they can be replaced with each other without affecting the color effect. Therefore, it is important to change the methods and methods of observation, and to find new methods for testing proofs and prints.
The second is the technical reason. It is worried that the print quality, color, and format can not meet the printing requirements. The paper and ink used are different from the printed ones. The results are not consistent with the printing. The technical difficulty is too high. It's hard to master. These technical factors in turn have led to a lack of trust in digital proofing and increased resistance to promotion.
HP-Jinhao Color Digital Proofing System has two main features:
1. With the HP DesignJet 5000 series large-format color inkjet printer, the printing speed has been greatly improved, completely eliminating the feeling that the inkjet printing speed is too slow, and it meets the requirements for practical use. The HP DesignJet 5000 Series large format printers come in two wide format models: 152cm and 107cm. The nominal print speed of the product (excluding data transfer time):
Model Maximum Speed ​​Fast Print Speed ​​Best Quality Print Speed
152cm 52.86m2/h 9.292/h 7.082/h
107cm 40.362/h 8.272/h 6.322/h
That is to say, when the best quality of full-format printing, print 4.6-5.9m per hour equivalent to about 7-10 pairs. This speed has been much higher than the overall speed that traditional proofing can achieve. I have personally recorded the time of printing 8 "Desktop Publishing and Design" magazine pages (16 large open), all of the printing time is less than 8min. HP JetExpress multi-nozzle high-frequency thermal inkjet technology, it integrates 512 nozzles on a 25mm wide print head, much larger than the number of nozzles in general inkjet printers, high-frequency jet up to 15,000 inkjets per second Point, each line can print 20mm width.
In addition to a significant increase in printing speed, the Hewlett-Packard DesignJet 5000 series large format printers also feature 6-color inks and special color layered printing technology, enabling up to 21 ink dots to be ejected in the same position, adding more ink dots The number of layers increases the fineness and depth of the printed image. The color rendering range of the ink completely includes the color rendering range of the conventional four-color printing, so it should be able to realize full reproduction by using it to simulate printing proofs. This ensures that the printer is used to simulate the accuracy of printed proofs.
2. Using the most widely used Harlequin RIP5.3 kernel as the core, Jinhao's Express RIP guarantees compatibility with most users' original systems. It also ensures that the proofs are exactly the same as the photo-taking film or direct plate-making, avoiding errors and waste. The two most important factors for color proofing are: Express RIP5.3 supports the PROFILE file of the ICC color management system, which ensures that the printed color is consistent with the printed color. The PROFILE file can be created in a generic way according to the printing conditions to simulate specific printing conditions. The second is that the system plugs in the imposition and folding software, which can be used to make pages for interpretation and get the large-format printing effect on the machine. If you do not have the function of make-up and folding, digital proofing is not good. Imposition and folding and documents can be used directly to output the film or plate to ensure the consistency of proofs and plates. In addition, the system also supports all the functions of Postscript Level 3, support PS, PDF, TIFF, EPS and other common formats of output, supports a variety of Postscript and TrueType fonts, to meet a variety of user requirements.
From the HP-Jinhao color digital proofing system, we can see that the current digital proofing system has entered a practical stage, it has the conditions of the color digital proofing system:
1. Good print quality, large enough print format, ability to simulate printing quality and color requirements, can provide a reference for printing.
2. The higher printing speed and production efficiency can more satisfy the time requirement of the customer. Even considering the interpretation time and data transmission time of RIP, five out-of-samples calculations per hour can print 40 proofs per shift, which is much higher than conventional proofing.
3. Lower investment and production costs have the advantage of market competition. According to preliminary estimates, the production cost of the HP-Jinhao Color Digital Proofing System (calculated as a sample of one sample sheet) is lower than traditional proofing, so there is a certain margin of profit.
If the system supplier can provide reliable system installation and commissioning services, reliable after-sales service guarantee and technical support, the last obstacle of color digital proofing can be eliminated, and the digital color proofing technology can be rapidly popularized.
The era of color digital production is coming - HP-Jinhao Color Digital Proofing System Impression
Digital printing, direct plate making, digital proofing and mathematical workflows are the fastest growing areas in recent years. As an alternative to traditional proofing and an indispensable accessory product in the direct platemaking process, many companies have seen the prospects for color digital proofing and tremendous business opportunities, investing a lot of human and material resources in research and development. At the DRUPA 2000 exhibition, various companies have come up with their own latest products, forming a situation of blooming flowers. In theory, the color digital proofing system can use any type of color printer, such as a color laser printer, a color inkjet printer, a color thermal sublimation printer, and the like. However, it is necessary to print at a high speed, but also to meet the requirements of large format and print quality, non-large-format color inkjet printer must be. The most widely used large-format color inkjet printers are Epson's Hewlett-Packard Co., the print resolution can reach 1200dpi or higher, the printing accuracy has been met, the print quality can be comparable with the print, even more than the print quality; print format can reach A0 Or bigger, it can adapt to the requirements of various kinds of printing format, and it is the best choice at present.