Application of color management
At present, the color management technology is mainly applied in the three aspects before printing in the color printing and copying process:
1, color separation technology
First of all, for a manuscript with normal colors, it is first scanned and input by a scanner. Due to the scanner's characteristic file, the color (ie, red, green, and blue) on the scanner is provided corresponding to the color space of the CIEl 976Lab. Relationship, so the application software system can obtain the color L, ab of the original color according to this relationship. Since the system has mastered the correspondence between the Lab color value and the red, green, and blue drive signals on the display, the original color can be correctly displayed on the screen in accordance with the conversion relationship given by the display profile. This ensures that the color displayed on the display matches the color of the original.
After observing the accurate image color display, the operator can perform image adjustment processing according to the screen color according to customer requirements. Since the characteristic file of the printing apparatus is included, after the image is separated, the correct color after printing can be observed on the display. . When the operator is satisfied with the color of the image, the image is separated and stored. During color separation, the correct percentage of dots is obtained according to the color conversion relationship carried by the printing device's characteristic file.
2, the screen soft proofing
The so-called soft proofing of the screen is a proofing method for simulating and displaying the effect of print output on the screen. This proofing technique is another proofing technique other than proofing on the paper [encyclopedia].
The soft proofing of the screen is accomplished through dedicated software, combined with the device characteristic file, and the display device is calibrated to complete the simulation of the image color on the display.
The screen soft proofing technique requires the operator to skillfully apply the color management technology and perform color matching so as to realize the simulation of the printing proofs.
3, digital proofing
The working principle of digital proofing is different from the traditional proofing working principle. Digital proofing is based on the digital publishing and printing system, and uses the same page graphic information to reproduce the effects of color graphics by the computer and its related equipment.
The key to digital proofing is to output proofs that can simulate the effects of printed output, providing the basis for future printing work. The first step in digital proofing is to select or create a reference profile that corresponds to the characteristics of the press. The printed reference property file and the printed paper property file are placed in the corresponding areas of the digital proofing software. After the proofing color management setting is completed, the proofs that are very close to the printed matter can be printed out.
Implementation of color management
1. Standardized management of printing process
Carefully do a good job in the standardization of various processes, data management, on the basis of the establishment of the characteristics of each process equipment file, so that accurate color space conversion.
Standardization: According to the quality standards required by customers, the standards for printing materials, inks, and other raw and auxiliary materials, as well as equipment, ambient light sources, testing standards, and standardized management documents are established.
Standardization: Operate strictly in accordance with work instructions, with particular attention to control points and control elements.
Dataization: Quantify on the basis of standardization and standardization, and all aspects of available data must be represented by means of testing, and data should be represented as much as possible. The three are complementary to each other, so as to achieve a stable quality standard.
2, monitor correction
The display is a window for dialogue between people and computers and is a soft proofing tool for prepress color management. It is one of the most important key links in color control. Calibration procedure (using professional software).
Equipment Detection - Warm-Up Preheating - Connect Measurement Instruments - Use Calibration Software (Set Target, Adjust Contrast, Brightness, Gamma Value) - Measure Standard Color Blocks - Calibration is complete.
3, remote digital proofing profile file management
If platemaking and printing belong to two places, for example, plate making in Shenzhen and printing in Kunming, after the digital proofing is confirmed by the customer, the electronic file will be directly transmitted to Kunming, digital proofing will be carried out, and then the sample will be printed. At this time, ensure the two places The digital proofing is consistent. To achieve this goal, you must do:
(1) Check and control the printing of the standard test strip, and perform a standard calibration once a week.
(2) The profiles created in the two places strive to be consistent so that the color and gradation performance characteristics are completely consistent.
4, image technology management
Image processing is the basis and key to replication.
1 According to the printing suitability, do a good job of the built-in gray balance curve and color correction amount, and standardize the black and white field calibration to achieve the standard reduction of the scan.
2 Carefully implement the standards of gray balance, tone reproduction, color correction, and sharpness enhancement, and strive to achieve the following: Gray balance is restored accurately, and the optimum field density value of the dot adjustment is fully utilized to achieve vivid saturation. Increased sharpness makes the image clear and delicate.
3 According to customer requirements, fix defects in the originals and perform artistic processing.
4 In order to make the level of print more abundant, compensation for non-linear transfer of printing process tones is made.
At present, the color management technology is mainly applied in the three aspects before printing in the color printing and copying process:
1, color separation technology
First of all, for a manuscript with normal colors, it is first scanned and input by a scanner. Due to the scanner's characteristic file, the color (ie, red, green, and blue) on the scanner is provided corresponding to the color space of the CIEl 976Lab. Relationship, so the application software system can obtain the color L, ab of the original color according to this relationship. Since the system has mastered the correspondence between the Lab color value and the red, green, and blue drive signals on the display, the original color can be correctly displayed on the screen in accordance with the conversion relationship given by the display profile. This ensures that the color displayed on the display matches the color of the original.
After observing the accurate image color display, the operator can perform image adjustment processing according to the screen color according to customer requirements. Since the characteristic file of the printing apparatus is included, after the image is separated, the correct color after printing can be observed on the display. . When the operator is satisfied with the color of the image, the image is separated and stored. During color separation, the correct percentage of dots is obtained according to the color conversion relationship carried by the printing device's characteristic file.
2, the screen soft proofing
The so-called soft proofing of the screen is a proofing method for simulating and displaying the effect of print output on the screen. This proofing technique is another proofing technique other than proofing on the paper [encyclopedia].
The soft proofing of the screen is accomplished through dedicated software, combined with the device characteristic file, and the display device is calibrated to complete the simulation of the image color on the display.
The screen soft proofing technique requires the operator to skillfully apply the color management technology and perform color matching so as to realize the simulation of the printing proofs.
3, digital proofing
The working principle of digital proofing is different from the traditional proofing working principle. Digital proofing is based on the digital publishing and printing system, and uses the same page graphic information to reproduce the effects of color graphics by the computer and its related equipment.
The key to digital proofing is to output proofs that can simulate the effects of printed output, providing the basis for future printing work. The first step in digital proofing is to select or create a reference profile that corresponds to the characteristics of the press. The printed reference property file and the printed paper property file are placed in the corresponding areas of the digital proofing software. After the proofing color management setting is completed, the proofs that are very close to the printed matter can be printed out.
Implementation of color management
1. Standardized management of printing process
Carefully do a good job in the standardization of various processes, data management, on the basis of the establishment of the characteristics of each process equipment file, so that accurate color space conversion.
Standardization: According to the quality standards required by customers, the standards for printing materials, inks, and other raw and auxiliary materials, as well as equipment, ambient light sources, testing standards, and standardized management documents are established.
Standardization: Operate strictly in accordance with work instructions, with particular attention to control points and control elements.
Dataization: Quantify on the basis of standardization and standardization, and all aspects of available data must be represented by means of testing, and data should be represented as much as possible. The three are complementary to each other, so as to achieve a stable quality standard.
2, monitor correction
The display is a window for dialogue between people and computers and is a soft proofing tool for prepress color management. It is one of the most important key links in color control. Calibration procedure (using professional software).
Equipment Detection - Warm-Up Preheating - Connect Measurement Instruments - Use Calibration Software (Set Target, Adjust Contrast, Brightness, Gamma Value) - Measure Standard Color Blocks - Calibration is complete.
3, remote digital proofing profile file management
If platemaking and printing belong to two places, for example, plate making in Shenzhen and printing in Kunming, after the digital proofing is confirmed by the customer, the electronic file will be directly transmitted to Kunming, digital proofing will be carried out, and then the sample will be printed. At this time, ensure the two places The digital proofing is consistent. To achieve this goal, you must do:
(1) Check and control the printing of the standard test strip, and perform a standard calibration once a week.
(2) The profiles created in the two places strive to be consistent so that the color and gradation performance characteristics are completely consistent.
4, image technology management
Image processing is the basis and key to replication.
1 According to the printing suitability, do a good job of the built-in gray balance curve and color correction amount, and standardize the black and white field calibration to achieve the standard reduction of the scan.
2 Carefully implement the standards of gray balance, tone reproduction, color correction, and sharpness enhancement, and strive to achieve the following: Gray balance is restored accurately, and the optimum field density value of the dot adjustment is fully utilized to achieve vivid saturation. Increased sharpness makes the image clear and delicate.
3 According to customer requirements, fix defects in the originals and perform artistic processing.
4 In order to make the level of print more abundant, compensation for non-linear transfer of printing process tones is made.
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