How to achieve the accuracy and unity of color (below)

Change of proofing methods

Due to the output of ordinary A3 format office inkjet printers used by designers, the requirements for color platemaking, printing, and proofing cannot be met. However, traditional offset printing and proofing methods also have many problems that cannot be overcome. Therefore, people have always been committed to discovering new proofing methods to improve the overall design, plate making, and printing production processes. For decades, people have found a number of different proofing methods (for example, proofing with optical or chemical proofing, Overlay proofing), but all due to some insurmountable reasons (such as expensive, still first film/post proofing, etc.) ), and can not replace the offset plate proofing, it is more difficult to enter the designer's line of sight.

In recent years, with the development of technology, the plate printing industry has undergone revolutionary changes. The investment in plate making and high-performance printing technology has changed the printer. Computer-to-plate technology has been developed at an alarming rate, opening up a whole new market for digital proofing technology. Therefore, a completely new proofing method has entered the field of vision - digital proofing using six-color ink-jet printing technology. With the development of color inkjet printing technology, it is increasingly recognized by people.

Compared with the traditional proofing methods, digital proofing has unparalleled advantages: the digital proofing system generally adopts 6-color ink system and precise ink drop control technology. Its color space is larger than the color space of proofing, and its color effect can be completely imitated. The color effect of traditional proofing meets the requirements of users for color proofing; the quality of digital proofing is stable, and it works in an ordinary office environment without being affected by human factors; its modification cost is low, the cycle is fast, investment is small; the space is small and the printing is adapted The development of new technologies, etc., are all necessary conditions for implementing a digital proofing system.

With the above requirements, the digital proofing system must be equipped with a corresponding color management system (professional proofing software) in order to meet people's requirements for proofing equipment. Because different devices deal with different colors, the color space of each device is different. Therefore, color mismatch is inevitable. Ideally, color should maintain color stability and predictability throughout the design and printing process. However, this requirement for color stability and predictability cannot be achieved naturally, and the color management system (CMS) can overcome this problem and help people achieve the desired color stability and predictability. CMS manages the gamut space of different devices in the workflow, and uses color management software (commonly known as RIP software) through three color management steps: device calibration, profiling, and color gamut conversion (color transfer). The scanned RGB color data is converted to CMYK data and converted to CMYK values ​​for different output devices for color proofing or actual printing.

Beautiful and harsh uniform

At present, the digital proofing system has been used by more and more people for design proofing and prepress proofing. To choose a digital proofing system, in addition to considering color accuracy (color accuracy) and repeatability (stability), factors such as speed and cost should also be considered. Recently, Hewlett-Packard launched a new "PhotoManual" series of A3+ format inkjet printers including the three models of DesignJet 10PS/20PS/50PS (picture). This is specifically designed and produced by Hewlett-Packard Co., Ltd. for pre-print proofing in graphic imagery, such as platemaking output centers, advertising design companies, and newspapers and magazines. It can well solve the problem that for a long time, it is difficult to accurately preview the color accuracy before printing, and provides a good helper for people with color photo.

This brand new pictorial hand can be said to be a complete set of color management and output systems, rather than a simple inkjet printer, it includes a new closed-loop color system, a unique HP print head technology, built-in RIP (color management) Software, HP proofing media and inks. It also complies with Apple Color Sync, Macintosh, and Windows ICC industry standard colors to ensure complete program management with full color management and output. The “Fantastic Hands” can achieve the color standard defined by the printer under certain conditions through a closed-loop color management system. The minimum ink droplets reach 4 picoliters. The color layering technology and the 6-color CMYKcm print head can provide a wider range of colors. At the same time, the reduction of granularity and smooth color transmission are realized, and the built-in Heidelberg Professional Color Management RIP is used in combination. In general, these features ensure a more accurate and realistic 2400 x 1200 dpi resolution high-quality picture output and proofing color. It has the following unique advantages in color performance:

The color accuracy of the "Photos" series of graphic printers is very high. It uses six color inks to ensure that there are enough color gamuts to reproduce the image. These inks have very strict color characteristics, can maintain color consistency over a long period of time, and the proof media also has a consistent display, which contributes to the device's color accuracy.

The "Photo Manual" series of printers is designed around color consistency. The color measuring instrument is included in the print head and it can monitor the small color film in the self-checking system. Self-calibration ensures that the printer maintains its factory settings, even though in most quality-conscious operations, the printer still has the ability to print as a pre-press sample. The printer's color consistency feature ensures that the same printed colors are brought together between the printer and the printer. This enables the "Photo Manual" series of printers to perform remote proofing. Two different users can share their work remotely by sending electronic files, saving time and money. At the same time, its self-calibration feature ensures that the locally printed sample has the same color quality as the sample printed at the source, and when using the same print media, it delivers a test pattern that is within 3 Delta-E on average. This for the prepress process, this accuracy ensures that the print sample does not introduce unnecessary variability.

The accuracy of inkjet colorants relative to the color of the printed ink. The color gamut owned by the "Photo Manipulator" series of graphic printers includes the colors used by printing machines worldwide. By using the software that drives the printer to control the internal color management controls, it is possible to use the color system used anywhere in the world. When inkjet proofing is performed using the ICC color profile, the sample print is easy to provide color and appearance, and the press operator can perform the matching effortlessly.

Currently, Hewlett-Packard has designed a variety of digital proofing solutions for the "Focus" series of printers, such as design proofing solutions for individual designers, design proofing solutions for design work groups, color proofing solutions, color layout proofing solutions, and Other proofing application solutions.

Source: Chinese Printing Community