Digital printing technology for copying and copying high simulation copying is inseparable from color management. Color management is the key and core of high simulation replication. Modern color management is a color control technology centered on color space changes. It achieves color-realistic reproduction through color space conversion.
First, create a high simulation copy color management system
The color management of calligraphy and painting replication technology refers to the management of the transfer of color space (such as scanners, displays, inkjet printers). Color management requires color information to be as consistent as possible in the process of input, processing, and output. However, the color in the process of transmission involves hardware and software that do not express the same color. Therefore, to maintain consistency and stability in the color information transfer process, standardized color management must be implemented.
The digital printing high simulation copying technology researched and developed in this paper is to use the coated rice paper, silk enamel + new technology (Epson Stylus Pro 9800 inkjet printer) + new software (EFI color management software) for high simulation copying color. management.
Second, high simulation copy color management methods and steps
High-simulation copy color management should use a standard ambient light source to keep the room light constant. Beijing Printing Company makes the original color of the painting and reproduction copy consistent with the screen color and coated rice paper printing color. The choice of light source should consider the following two aspects: First, a better color temperature, the basic observation lighting in the international standard is recommended as a CIED50 standardized light source that matches the solar spectrum distribution of the relevant color temperature at 50000 K. The second is a fluorescent tube with a higher display index and an R value greater than 95% of the spectral display characteristics. The experiment uses the fluorescent tube of Germany JUS company to display the index of 97% to completely reflect the true color of the illuminated object.
(1) Color management of the scanner
One of the key aspects of the reproduction and reproduction of the painting and calligraphy is the physical scanning of the original, and all the information needed from the original is obtained from the beginning. This requires calibration of the scanner.
The purpose of the scanner calibration is to correct the brightness, contrast, and black and white fields of the scanning device to ensure that the same image data can be obtained for the same original when the scanner is initialized to zero. To achieve this goal, a scanner profile must be created. The calibration and profile generation of the scanner is done by means of 1T8.7/1 (standard transmission for scanning) or 1T8.7/2 (standard reflection for scanning) standard original 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 the scanner profile generation software Scanopen.
1. Turn on the scanner and 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 stage.
3. When using the flatbed scanner, be sure to align the edge of the color card with the frame of the stage to prevent the scanned image from tilting.
4. Launch the scanning application, clear all scanner color adjustment, control and management options, set up the scanner, and record the scanner's settings in detail.
5. Open Scanopen, click “Start to generate profileâ€, follow the prompts to select the entire color card, and then click the “Scan†button to scan the card image.
6. According to the prompts, check the "upper left corner", "upper right corner" and "lower right corner" 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 option, input the digital image obtained by the scan card, that is, the test file, then select the corresponding reference file in the reference folder, click The "Open" button feeds the selected reference file into the color management application.
9. Create and save a configuration file: Click the "Create Configuration File" button to bring up the Save Configuration File dialog box.
(II) Color management of micro-jet printers
For digital printing high-simulation copying, it is most important to carefully manage the color management of micro-jet printing. Epson Stylus Pro 9800 inkjet printer + color management software + coated rice paper, silk enamel to form the color management of the entire system. The specific color management steps are as follows:
1. Basic linearization of inkjet printers
The basic linearization determines the physical properties of the pigmented ink coated with rice paper, silk, and canvas to optimize the total inkjet volume and single-channel ink volume of the inkjet printer. The use of the best amount of ink to obtain the largest possible color density provides the basis and optimization of the creation of micro-jet printing coated rice paper and silk file ICC files to establish the basis of color management.
The linearization of inkjet printers is based on the principle of correcting the deviation of the printed colors by examining and adjusting the density of the various stages of the microjet. Therefore, the micro-jet machine is first adjusted to the most stable working state. By using the GMG closed-loop correction technique, by controlling the inkjet printer inkjet amount, a new print color difference value and an initial color difference value are relatively uniform, and a precise closed-loop color correction is ensured by circulation to ensure a repeating and stable inkjet printing system.
2. Carefully establish the ICC file after color space conversion. Based on the linearized file produced and the measured ink volume, the Profile Maker color profile generation software generates an ICC file to be converted in Photoshop software for converting the RGB format to inkjet CMYK format. And printing the ECI 2002 color standard of the substrate such as coated rice paper, and then measuring the chromaticity value LAB of 1485 color blocks by a spectrophotometer to generate a new ICC file, which is the basic database of the color management module of the inkjet printer. Achieve the maximum color gamut of substrates such as coated rice paper. At this time, the accuracy of color reproduction is about 90%.
3. Carefully establish the final ICC file.
Due to the complexity of inkjet printing color, only the ICC file generated by one color space conversion can not achieve accurate color reduction, local hue, local level gray balance and color shift. Therefore, it is necessary to combine the experience and carefully modify and edit the ICC file after several times of color space conversion. This modification is a fine trace, which is a high-end, eye-like modification. This modification is a color management The most important work has made the accuracy of color reproduction of micro-jet printing even higher.
After careful modification and editing, print the excellent standard sample sheet and measure the LAB value of 1485 color blocks through Profile Make. The characteristic file generation software generates the final ICC file, and the accuracy of the color reproduction is about 97%, so that the color reproduction of the micro-jet printing of the painting and calligraphy is extremely effective.
After the color management of the scanner and the printer, and then scanning and printing the reproduction of the painting and calligraphy, the color reproduction accuracy of the original can be greatly improved, and the actual production requirements can be met.
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