Color Management of Art Reproduction Technology

Using digital printing technology for high-fidelity reproduction of art can not be separated from color management. 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 art 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.

This article researches and develops the digital printing high simulation copying technology, uses the rice paper with the coating, the silk thread + new craft (epson stylus pro 9800 ink-jet printer) + new software (efi color management software), carries on the high simulation to duplicate the 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, so that the original color of the artwork is basically 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. In the international standard, the basic observation lighting is recommended as a cied50 standard light source that matches the correlated spectral temperature of 50000 k. The second is a fluorescent tube with a higher display index and r value greater than 95% of the spectral display characteristics. Experiments using a fluorescent lamp of the German jus company showed an index of 97% that completely reflects the true color of the illuminated object.

(A) Scanner Color Management

One of the key links in the high-fidelity reproduction of works of art lies in the physical scanning of the original work. From the very beginning, all information needed by the original work is obtained 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 Scanning 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 property file by means of the scanopen software 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 software 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 sends 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. Use epson stylus pro 9800 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, using the optimum ink volume to obtain the largest possible color density provides the foundation and optimization characteristics for the creation of art micro-jet printing rice paper and silk 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 ink jet 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 repeatable 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 profile maker software generates the software to generate an icc file to be converted in photoshop software. This file is used to convert the rgb format to cmyk format for inkjet printing. , And print out the eci 2002 color mark of coated substrates and other substrates, and then measure the colorimetric value of 1485 color blocks by spectrophotometer lab, to generate a new icc file, the basic database of the inkjet printer color management module, The maximum color gamut of substrates such as coated rice paper is achieved. At this point, the accuracy of color reduction is about 90%.

3. Carefully establish the final icc file

Due to the complexity of the ink jet printing color, only the icc file generated by one color space conversion can not reach the exact reduction of the color, and the local hue and local level gray balance still have color deviation. Therefore, we must combine experience to carefully modify and edit the icc file after several times of color space conversion. This modification is a delicate trace, and it is a kind of advanced revision-like 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 careful modification and editing, the proof sample is printed, and the lab value of 1485 color patches is measured, through the profile make. The feature file generation software generates the final icc file, so that the color reproduction accuracy rate reaches about 97%, so that the artistic micro-jet printing color reduction is extremely effective.

After the color management of scanners and printers, then the artwork is scanned and printed, which can greatly improve the original color reproduction accuracy and meet the actual production requirements.