Digital printing has the following typical features:
a. The digital printing process is Computer-to-Paper/Print, which is the process of directly converting digital files/pages into prints.
b. The process of forming the final image of digital printing must be digital and does not require the intervention of any intermediary simulation process or carrier;
c. The information in the digital printed matter is 100% variable information. The two prints output from the target can be completely different.
This shows that the basic composition of the digital printing system is basically the same as the traditional printing system, but it is an all-digital production system with its own characteristics.
3 Color management technology in digital printing In digital printing, when an image is input, people often find that the original image is scanned and input by the scanner. The color displayed on the screen is different from the color output by the output device. , And tend to think that this is a problem caused by the color cast of the image scanned by the scanner. In fact, the problem can not be completely pushed to the scan, because even when the scanner scans correctly, the display, printer, etc. may still cause the color difference between the scan color and the reproduced color, which requires correcting the display, the printer, and the entire system.
According to the ICC specification, the elements of color management are clarified.
a. Device-independent color space PCS (Profile ConnectionSpace). ICC selected CIELAB and CIEXYZ as device-independent color spaces for color management;
b. Device profile (Profile file). Profile files are used to describe the device's color characteristics and color gamut. All devices in the color reproduction system (scanners, monitors, printers, etc.) must have their own profile.
The color management system establishes the mapping relationship between the device-specific color space and the device-independent color space PCS according to the information provided by the device profile.
c. Color Management Module (CMM). When performing color space conversion, the color management module CMM is used to interpret the device profile description profile file, and perform color data conversion between different devices according to the device color features described in the profile file.
The relationship between the three elements of the color management system is shown in Figure 2.
At present, there are many image input and output devices equipped with ICC profiles. By using the ICC defined values, the input and output color consistency can be well regulated. ColorSyne Color Management System on Macintosh computers; after PC launches, since Windows launches, the color management definition file used by the monitor is listed as a standard configuration, and a display device profile description profile file conforming to the ICC standard is established for the CRT. Performing color correction and color management plays an important role. It also provides ICC profiles defined by some scanners and printers, all of which provide users with great convenience.
In the actual color management technology application, the PDF file is converted to its corresponding color space according to the ICC characteristics of various output devices. The PDF file is an abbreviation of the Portable Document Format, which means the portable file format, and now it has become The cross-platform, universal format can be displayed and read on any platform unimpeded, and even become the most popular delivery method such as online e-magazine. PDF files can be created using software such as PageMaker, and can be read and modified by software such as Acrobat. The PDF file adjustment ensures that the original, screen display, digital proofing and printing are exactly the same. It includes the Pantone color library, which can perform four-color to spot color, spot to spot color, spot color to spot color matching, effectively solve the above problem.
However, some important packaging design elements in the PDF will be lost, so it is not suitable for representing complex packaging designs. To this end, the software developed for prepackaged prepress software is provided with functions for the packaging process. Among the most known are the dew-whitening functions, and the ability to handle spot colors and custom inks, such as ink usage and print data. Measurement and so on.
a. The digital printing process is Computer-to-Paper/Print, which is the process of directly converting digital files/pages into prints.
b. The process of forming the final image of digital printing must be digital and does not require the intervention of any intermediary simulation process or carrier;
c. The information in the digital printed matter is 100% variable information. The two prints output from the target can be completely different.
This shows that the basic composition of the digital printing system is basically the same as the traditional printing system, but it is an all-digital production system with its own characteristics.
3 Color management technology in digital printing In digital printing, when an image is input, people often find that the original image is scanned and input by the scanner. The color displayed on the screen is different from the color output by the output device. , And tend to think that this is a problem caused by the color cast of the image scanned by the scanner. In fact, the problem can not be completely pushed to the scan, because even when the scanner scans correctly, the display, printer, etc. may still cause the color difference between the scan color and the reproduced color, which requires correcting the display, the printer, and the entire system.
According to the ICC specification, the elements of color management are clarified.
a. Device-independent color space PCS (Profile ConnectionSpace). ICC selected CIELAB and CIEXYZ as device-independent color spaces for color management;
b. Device profile (Profile file). Profile files are used to describe the device's color characteristics and color gamut. All devices in the color reproduction system (scanners, monitors, printers, etc.) must have their own profile.
The color management system establishes the mapping relationship between the device-specific color space and the device-independent color space PCS according to the information provided by the device profile.
c. Color Management Module (CMM). When performing color space conversion, the color management module CMM is used to interpret the device profile description profile file, and perform color data conversion between different devices according to the device color features described in the profile file.
The relationship between the three elements of the color management system is shown in Figure 2.
At present, there are many image input and output devices equipped with ICC profiles. By using the ICC defined values, the input and output color consistency can be well regulated. ColorSyne Color Management System on Macintosh computers; after PC launches, since Windows launches, the color management definition file used by the monitor is listed as a standard configuration, and a display device profile description profile file conforming to the ICC standard is established for the CRT. Performing color correction and color management plays an important role. It also provides ICC profiles defined by some scanners and printers, all of which provide users with great convenience.
In the actual color management technology application, the PDF file is converted to its corresponding color space according to the ICC characteristics of various output devices. The PDF file is an abbreviation of the Portable Document Format, which means the portable file format, and now it has become The cross-platform, universal format can be displayed and read on any platform unimpeded, and even become the most popular delivery method such as online e-magazine. PDF files can be created using software such as PageMaker, and can be read and modified by software such as Acrobat. The PDF file adjustment ensures that the original, screen display, digital proofing and printing are exactly the same. It includes the Pantone color library, which can perform four-color to spot color, spot to spot color, spot color to spot color matching, effectively solve the above problem.
However, some important packaging design elements in the PDF will be lost, so it is not suitable for representing complex packaging designs. To this end, the software developed for prepackaged prepress software is provided with functions for the packaging process. Among the most known are the dew-whitening functions, and the ability to handle spot colors and custom inks, such as ink usage and print data. Measurement and so on.
[ references]
[1] ICC Profile Format Specification. Version Color Consortium. 1997.
[2] Hu Tao, Zhang Xiaoyan, et al. Color management system based on ICC standards. Printing Technology. 2000,(2):1345.
[3] Robert Y. Chung. ICC-Bazed CMS & Its Color Matching Per-formance. TAGA97, 195-205.
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