The use of digital printing technology for copying of high-quality copy of calligraphy and painting is inseparable from color management, and color management is the key and core of high-simulation replication. Modern color management is a color control technology whose core is the change of color space. It achieves true color reproduction through color space conversion.
First, create a high-simulation copy color management system
The color management of calligraphy and painting reproduction technology refers to the management of the transfer of color space (such as scanners, monitors, inkjet printers). Color management requires the color information in the input, processing, and output of the three processes to achieve the same color as possible but the color in the transfer process involves the expression of color is not exactly the same hardware and software. Therefore, to maintain consistency and stability in the process of color information delivery, standardized color management must be implemented.
The digital printing high-simulation copying technology researched and developed in this thesis is the use of coated rice paper, silk enamel + new technology (EpsonStylusPro9800 inkjet printer) + new software (EFI color management software) for high-simulation copy color management.
Second, high simulation copy color management methods and steps
High-simulation copy color management should adopt standard ambient light sources to keep the indoor light constant. Beijing Printing Company made the original color of the painting and calligraphy copy the same as the screen color and the printing color of the coated rice paper. The following two aspects should be taken into consideration when choosing a light source: First, a good color temperature. The basic observation lighting in the international standard standard is recommended as the CIED50 standard light source that matches the correlated spectral distribution of daylight with a color temperature of 50000K. The second is a fluorescent tube with a higher display index, R value should be greater than 95% spectral display characteristics. Experiments using a fluorescent lamp of the German JUS company showed an index of 97% that completely reflected the true color of the illuminated object.
(A) Scanner Color Management
One of the key links in the high-fidelity replication of paintings and reproductions lies in the physical scanning of the originals. From the very beginning, all the necessary information is obtained from the original during scanning. This requires the scanner to be calibrated.
The purpose of the scanner calibration is to calibrate the brightness, contrast, and black and white fields of the scanner to ensure that when the scanner is initialized to zero, the same image data can be obtained for the same original whenever it is scanned. To achieve this goal you must create a scanner profile. Scanner calibration and profile generation was accomplished with the help of 1T8.7/1 (Standard Transmittal for Scanning) or 1T8.7/2 (Standard Reflective for Scanning) standard manuscripts and scanner profile generation software. The following are the specific steps for the calibration of the scanner and the generation of the profile by means of Scanner profile generation software Scanopen.
1. Turn on the scanner and the heat pipe 30 minutes in advance to ensure that the light of the lamp reaches a normal and stable state.
2. Clean the glass of the flatbed scanner table.
3. When using the flatbed scanner, be careful to align the edge of the color card with the edge of the stage to prevent tilting of the scanned image.
4. Start the scanning application, clear all options for color adjustment, control, and management of the scanner, set the scanner, and record the scanner's setup status in detail.
5. Open Scanopen, click "Start to generate a profile", follow the prompt box to select the entire color card, and then click the "Scan" button to scan the color card picture.
6. When prompted, check the "top left", "top right", and "bottom right" of the color card.
7. Click the "Create Profile" button to create a scanner's ICC profile and the profile is created.
8. Load the test file and reference file: Open the color management application again, enter the scanner color management options, enter the digital image obtained by scanning the card, that is, the test file, and then select the corresponding reference file in the reference folder, Click the "Open" button to send the selected reference file to the color management application.
9. Create and save the configuration file: Click the "Create Configuration File" button to pop up the Save Configuration File dialog box.
(B) Micro-spray printer color management
For digital printing high-simulation copy products, careful color management of micro-jet printing is the most critical. Epson Stylus Pro9800 inkjet printer + color management software + coated rice paper, silk enamel to form the entire system of color management. Specific color management steps are as follows:
1. Fundamental linearization of inkjet printers
The basic linearization determines the physical properties of pigmented inks coated with rice paper, silk enamel, and canvas, and optimizes the total ink jet volume and single-channel ink volume of the inkjet printer. That is, obtaining the largest possible color density with the optimum ink volume provides the basis and optimization characteristics for the creation of the calligraphy and reproduction micro inkjet printing rice paper and silk file ICC files, thereby establishing the basis for color management.
The principle of linearization of ink jet printers is to correct printing color deviations by checking and adjusting the density of the micro-jets at various levels. Therefore, first adjust the micro-injector to the most stable working condition. Through the use of GMG closed-loop correction technology to control the inkjet printer inkjet volume to achieve a new print color table color difference and the initial color difference is relatively uniform through the cycle and accurate closed-loop color calibration to ensure a repeat and stable inkjet printing system.
2. Carefully establish the color space converted ICC file. Based on the linearization file and the measured ink volume, the ProfileMaker color profile generation software generates an ICC file that will be converted in Photoshop software. This file is used to convert the RGB format to inkjet-printed CMYK format. And print out the ECI2002 color label coated with substrates such as rice paper, and then measure the colorimetric value LAB of 1485 color blocks through a spectrophotometer to generate a new ICC file, which is the basic database of the inkjet printer color management module. The maximum color gamut of substrates such as cloth rice paper. At this point, the accuracy of color reduction is about 90%.
3. Carefully establish the final ICC file.
Due to the complexity of ink jet printing color, only one ICC file generated by the color space conversion can not reach the exact reduction of the color, and the local hues and local levels of gray balance still have color shift. Therefore, we must combine experience to carefully modify and edit the ICC file after several times of color space conversion. This kind of modification is a delicate and slight one, and it is a high-level, eye-catching modification. This revision is one of color management. The most important job is to improve the accuracy of color reduction in micro-jet printing.
After meticulous modification and editing, the proof sample is printed and the LAB values ​​of 1485 color blocks are measured, via ProfileMake. The characteristic file generation software generates the final ICC file, so that the color reproduction accuracy rate reaches about 97%, so that the color reproduction of the calligraphy and painting micro-jet printing is extremely effective.
After the color management of scanners and printers, and then scanning and printing of the paintings and reproductions, the original color reproduction accuracy can be greatly improved, and the actual production requirements can be met.
First, create a high-simulation copy color management system
The color management of calligraphy and painting reproduction technology refers to the management of the transfer of color space (such as scanners, monitors, inkjet printers). Color management requires the color information in the input, processing, and output of the three processes to achieve the same color as possible but the color in the transfer process involves the expression of color is not exactly the same hardware and software. Therefore, to maintain consistency and stability in the process of color information delivery, standardized color management must be implemented.
The digital printing high-simulation copying technology researched and developed in this thesis is the use of coated rice paper, silk enamel + new technology (EpsonStylusPro9800 inkjet printer) + new software (EFI color management software) for high-simulation copy color management.
Second, high simulation copy color management methods and steps
High-simulation copy color management should adopt standard ambient light sources to keep the indoor light constant. Beijing Printing Company made the original color of the painting and calligraphy copy the same as the screen color and the printing color of the coated rice paper. The following two aspects should be taken into consideration when choosing a light source: First, a good color temperature. The basic observation lighting in the international standard standard is recommended as the CIED50 standard light source that matches the correlated spectral distribution of daylight with a color temperature of 50000K. The second is a fluorescent tube with a higher display index, R value should be greater than 95% spectral display characteristics. Experiments using a fluorescent lamp of the German JUS company showed an index of 97% that completely reflected the true color of the illuminated object.
(A) Scanner Color Management
One of the key links in the high-fidelity replication of paintings and reproductions lies in the physical scanning of the originals. From the very beginning, all the necessary information is obtained from the original during scanning. This requires the scanner to be calibrated.
The purpose of the scanner calibration is to calibrate the brightness, contrast, and black and white fields of the scanner to ensure that when the scanner is initialized to zero, the same image data can be obtained for the same original whenever it is scanned. To achieve this goal you must create a scanner profile. Scanner calibration and profile generation was accomplished with the help of 1T8.7/1 (Standard Transmittal for Scanning) or 1T8.7/2 (Standard Reflective for Scanning) standard manuscripts and scanner profile generation software. The following are the specific steps for the calibration of the scanner and the generation of the profile by means of Scanner profile generation software Scanopen.
1. Turn on the scanner and the heat pipe 30 minutes in advance to ensure that the light of the lamp reaches a normal and stable state.
2. Clean the glass of the flatbed scanner table.
3. When using the flatbed scanner, be careful to align the edge of the color card with the edge of the stage to prevent tilting of the scanned image.
4. Start the scanning application, clear all options for color adjustment, control, and management of the scanner, set the scanner, and record the scanner's setup status in detail.
5. Open Scanopen, click "Start to generate a profile", follow the prompt box to select the entire color card, and then click the "Scan" button to scan the color card picture.
6. When prompted, check the "top left", "top right", and "bottom right" of the color card.
7. Click the "Create Profile" button to create a scanner's ICC profile and the profile is created.
8. Load the test file and reference file: Open the color management application again, enter the scanner color management options, enter the digital image obtained by scanning the card, that is, the test file, and then select the corresponding reference file in the reference folder, Click the "Open" button to send the selected reference file to the color management application.
9. Create and save the configuration file: Click the "Create Configuration File" button to pop up the Save Configuration File dialog box.
(B) Micro-spray printer color management
For digital printing high-simulation copy products, careful color management of micro-jet printing is the most critical. Epson Stylus Pro9800 inkjet printer + color management software + coated rice paper, silk enamel to form the entire system of color management. Specific color management steps are as follows:
1. Fundamental linearization of inkjet printers
The basic linearization determines the physical properties of pigmented inks coated with rice paper, silk enamel, and canvas, and optimizes the total ink jet volume and single-channel ink volume of the inkjet printer. That is, obtaining the largest possible color density with the optimum ink volume provides the basis and optimization characteristics for the creation of the calligraphy and reproduction micro inkjet printing rice paper and silk file ICC files, thereby establishing the basis for color management.
The principle of linearization of ink jet printers is to correct printing color deviations by checking and adjusting the density of the micro-jets at various levels. Therefore, first adjust the micro-injector to the most stable working condition. Through the use of GMG closed-loop correction technology to control the inkjet printer inkjet volume to achieve a new print color table color difference and the initial color difference is relatively uniform through the cycle and accurate closed-loop color calibration to ensure a repeat and stable inkjet printing system.
2. Carefully establish the color space converted ICC file. Based on the linearization file and the measured ink volume, the ProfileMaker color profile generation software generates an ICC file that will be converted in Photoshop software. This file is used to convert the RGB format to inkjet-printed CMYK format. And print out the ECI2002 color label coated with substrates such as rice paper, and then measure the colorimetric value LAB of 1485 color blocks through a spectrophotometer to generate a new ICC file, which is the basic database of the inkjet printer color management module. The maximum color gamut of substrates such as cloth rice paper. At this point, the accuracy of color reduction is about 90%.
3. Carefully establish the final ICC file.
Due to the complexity of ink jet printing color, only one ICC file generated by the color space conversion can not reach the exact reduction of the color, and the local hues and local levels of gray balance still have color shift. Therefore, we must combine experience to carefully modify and edit the ICC file after several times of color space conversion. This kind of modification is a delicate and slight one, and it is a high-level, eye-catching modification. This revision is one of color management. The most important job is to improve the accuracy of color reduction in micro-jet printing.
After meticulous modification and editing, the proof sample is printed and the LAB values ​​of 1485 color blocks are measured, via ProfileMake. The characteristic file generation software generates the final ICC file, so that the color reproduction accuracy rate reaches about 97%, so that the color reproduction of the calligraphy and painting micro-jet printing is extremely effective.
After the color management of scanners and printers, and then scanning and printing of the paintings and reproductions, the original color reproduction accuracy can be greatly improved, and the actual production requirements can be met.
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