Your own proofs hit yourself

A new generation of digital proofing system ---- HP Dijet Proofing as a link between prepress and printing, is not only an important tool for checking the quality of plate making and proofreading personnel, providing the basis and standard for the printing process, but also during the production process. An important means of quality management. When it comes to proofing, perhaps most people think of the proofing machine in the printing factory. Indeed, as the main tool for proofing, the proofing machine has been around for a long time. However, in the 21st century of digitalization, the traditional proofing technology has become more and more popular in terms of color image reproduction performance, image resolution, image sharpness, proof output stability, consistency, output speed, system cost, and personnel quality requirements. More than enough. With the exposure of these shortcomings of traditional proofing and the development of technology, a new proofing technology that directly outputs digital manuscripts after digital processing has emerged and has become more and more popular. Digital proofing digitally uses a large format printer to directly output proofing. It replaces the traditional proofing film and the lengthy printing process. It has become a necessary link in the digital printing workflow.

The advantages and disadvantages of traditional digital proofing Digital proofing technology has aroused great concern in the printing industry. People in the printing industry have high hopes for it. Fast and stable have become the two major advantages of digital proofing. The two major advantages are mainly reflected in: First, the reducibility is good and the color is stable. Digital proofing uses a fully digital process that is minimally affected. Second, the proofing speed is fast and the efficiency is high. It is suitable for short-run printing. Third, it occupies a small space and has a low investment. Digital proofing only takes a dozen square meters and the initial investment is only a few tens of millions (computers, large format printers and related software). Fourth, the entire process flow is digitalized and simple and convenient. Fifth, remote digital proofing can be realized, breaking the limitations of time and space: the use of network technology to digital files transmitted to remote sites for digital proofing, simple and practical. Sixth, it has achieved filmless proofing, on the one hand, it has reduced the printing and printing of traditional proofing processes, and on the other hand it also caters to the development trend of green printing, which is conducive to environmental protection.
Because digital proofing has these outstanding advantages, digital proofing technology has quickly been popularized and popularized in recent years, and people gradually realize the efficiency and advantages of the technology. However, there are advantages and disadvantages. With the popularization of digital technologies, their shortcomings have gradually emerged, mainly reflected in:
1. Although the development of digital proofing technology is becoming more and more mature, the technology of digital proofing is not yet very mature. In particular, the printing industry in China is not unique to printability, and there is no uniform standard for digital proofing equipment; various types of printing equipment The color is not stable and true color management cannot be achieved. According to professional personnel analysis, digital proofing color matching in the world is based on European standards and is not suitable for the standards of existing printing factories in China. That is to say, we did not integrate it into the Chinese market when we introduced its hardware equipment. , so that I can only use it. The original digital proofing system is only a single hardware platform. Over time, it cannot adapt to the development of digital proofing, but also affects its development and promotion in China.
2. Sample modification process is cumbersome and costly. Although it has been improved compared to the traditional proofing method, the traditional digital proofing still requires the customer to take the produced electronic document to the color printing factory for digital proofing, and then send back the printed sample proof to the customer for signature approval, and then feedback the information in printed form. Factory, plate printing. If there are any errors in the proofs, they will be returned to the customer for modification and the above operation process will be repeated. In order to produce a satisfactory sample, customers often have to go to the color printing plant several times or even dozens of times. Even if the customer just made a small change, they must get a color printing factory to re-proof. Not only is time wasted, but in terms of cost, a large-format sample will be produced at a relatively high price. Repeatedly many times, the customer's cost will naturally not be low.
These shortcomings have not only hindered the popularization and popularization of digital proofing technology, but have also greatly affected the development of computer-to-platemaking technology in China.

The new era of digital proofing In order to solve the marketing bottleneck of these digital proofing technologies, Hewlett-Packard China has carried out active research work, starting from the analysis of customer needs, in-depth understanding of the current digital proofing problems to be solved, and addressing these issues. Putting in a lot of manpower and material resources to find solutions, constantly improving the existing proofing system, and creatively proposing a new digital flow proofing combination of “two proofers + one set of color management system” has caused great repercussions in the industry. After unremitting efforts, in the end, Hewlett-Packard China Co., Ltd. and Beijing Rainbow DiJie Digital Technology Co., Ltd. jointly launched a new "HP Dijet Digital Proofing System." The system is based on the HP large format printer and incorporates the color management data integration module developed by Rainbow Dijet. It is specifically designed for China's printing and publishing industry. It has been approved by a number of experts from the Beijing Printing Association Science and Technology Committee and has strong promotion potential.
The hardware of the HP Dijet Digital Proofing System is newly launched by Hewlett-Packard Co., Ltd. The “Hands-on” A3+ Format hp designjet 10ps/20ps/50ps Series Digital Design Proofer and Hewlett-Packard’s “Speed ​​and Quality” All-Around hp designjet 5000 Large Format The printer is used as an output terminal and is composed of the rainbow color management system CMS developed by Beijing Rainbow Dijet Digital Technology Co., Ltd. This new digital process proofing combination improves the deficiencies of traditional digital proofing products, making the entire workflow easier and time-saving.
The HP10PS has a new closed-loop color calibration system and a built-in color sensor that automatically adjusts the output to compensate for inaccurate colors due to unfavorable print conditions, materials, or environments, to match the preset color profile. Consistent, ensuring the accurate output of data files; HP's "photoshooter" uses a new six-color ink system with outstanding effects, including light blue, light magenta, and cyan, magenta, yellow, and black, so the printable color range is more Wide, able to reproduce colors more accurately; HP10PS applies HP's new high-performance print head, print head up to 304 nozzles, droplets only 4 picoliters, combined with HP's unique color layered printing technology, resolution Up to 2400 × 1200 dpi, achieving perfect reproduction of every detail and extreme vividness of color; HP10PS also has specially designed high-quality media specially designed for proofing. HP matte or glossy proofing paper enables the output effect to truly mimic the offset printing effect. . All of these features ensure complete program management with full color management and accurate color output.
Transfer the file to be output to the computer that is connected to the proofer. After determining that the file is correct, that is to say the file is a file that the proofer can accept, and after the finalization of the document, it is output by the HP10PS proofer. In addition, due to the lack of uniqueness of the print industry in China's printing industry, it brings a lot of inconvenience to digital printing, which requires us to master the quantitative and variable. Here, the variable refers to printability: speed, pressure, and temperature, humidity, ink suitability, etc., which are affected by the environment. Therefore, no matter how confident the designer is to use HP10ps for digital proofing, he must carefully select the corresponding parameters, including ink, paper, accuracy, and print curve. This curve is not a curve that the proofer brings. Instead, HP and RainbowDiversey provide the correction needed for each combination based on the color difference between different papers, different inks, different equipment, and different environments commonly used by Chinese users. After drawing the digital proofing curve. Rainbow Dijet also developed a rainbow color management system suitable for domestic users based on this status.
The effect of digital proofing is consistent with the simulated printing effect and is the main goal pursued by various digital proofing color management systems (CMS). The Rainbow Color Management System CMS uses the ICC standard to manage the gamut space of different devices in the workflow, and consists of three parts: First, the device-independent CIE reference color space; second, the device's ICC profile (PROFILE); The third is the color management module CMM. Among them, the color management module CMM is the core, it is the use of professional digital proofing software combined with other color management software, fine-tuned color space conversion data integration. These data centered on commonly used printed materials and processes in the country, and made a lot of in-depth color space model experiments under different production conditions to simulate the printing and proofing results and measured them, so the data is accurate and comprehensive.

When rainbow color management system manages the color of proofing, it usually goes through the following three basic steps:
One is to generate an ICC Profile that reflects proofing or printing characteristics. For traditional proofing or printing standard ISO IT 8.7/3 color block diagram, rainbow ink control data management standard, software PrintOpen (or ProfileMaker, ColorFlow), and spectrophotometer X-rite DTP-41 (or GretagMacbeth SpetroScan), Generate ICC profiles that reflect printability. The second is to generate an ICC Profile that reflects the characteristics of the color printer and the printer paper used. For color printers that print ISO IT 8.7/3 color block diagrams without color management, the same software and the same spectrophotometer are used to generate the printer's ICC profile. The third is color gamut conversion. The ICC Profile of printability and the ICC Profile of the printer are used in the digital proofing software, and the data conversion of the color space is performed using the HP Dijon Color Management Module CMM, so that the image and the corresponding printability of the image printed by the HP printer are printed out. The standard proofs achieve the same color.
Applying this innovative digital process proofing combination, while the printing factory already owns the HP Designjet 5000 large format printer, it also provides customers with an HP 10PS printer with a price of only about RMB 10,000. It uses Rainbow Dijet to specifically proof the HP large format digital image. The design of the color management system, you can easily achieve HP digital process proofing combination. The 10ps printer adopts HP Dijet's color management data integration technology. Once the proofreading color file (ICC file) is determined, the proof color of each image is determined and the relevant steps can be followed. At the same time, the 10ps graphics color inkjet printer is stable and can meet the needs of different environments. After the finalization of the design, the customer can save a large amount of production fee by using digital proofing before the customer is finalized. The repeatability is high and errors are not likely to occur. And it can be proofed remotely, greatly shortening the distance between regions, and it can also save a considerable amount of driving expenses. With this kind of HP digital process proofing combination, customers can easily complete small-scale proofing within A3 within their own office space, and at any time to correct mistakes made by proofs until they are satisfied, and then send electronic documents to India for printing. Not only can it significantly increase work efficiency, but it can also reduce the inconvenience caused by process links.
In addition, the system consists of four products that target different markets. They are HP Dijet Full 5000 Professional, A3+10PS Professional, A3+10PS Standard, and HP Dijet Color Books 1055 Professional. The needs of different departments such as magazines, newspapers, and printing companies basically met and met the domestic market's demand standards.
At present, "HP --- Dijie Digital Proofing System" has been applied in production. The promotion and practice of digital technology in various industries in the country will surely lead to an unavoidable revolution. Digital printing users will also gain a lot of benefits from proofing stability, efficiency, and cost, so that the design will be more accurate. Easy. At the same time, I hope that the world will be more colorful and more exciting.