Small Paper Boxes For Sweets Color Management Of Art Reproduction Techniques

Small Paper Boxes For Sweets Color management of art reproduction techniques

 

The use of digital printing technology for high simulation of art works is inseparable from color management. Color management is the key and core of high simulation reproduction. Modern color management is based on color space change as the core of color control technology. It achieves realistic color reproduction by 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 color information in the input, processing, output three processes as far as possible to achieve the same color but color in the process of transmission involves the expression of color is not exactly the same software and hardware. Therefore, in order to maintain the consistency and stability of color information transmission, it is necessary to implement standardized color management.

 

The digital printing high simulation reproduction technology developed in this paper is to use coated rice paper, silk, new technology (Epson Stylus Pro 9800 inkjet printer) and new software (EFI color management software) for high simulation reproduction of color management.

 

Two, high simulation copy color management methods and steps

High simulation reproduction color management should adopt standard ambient light source to keep the indoor light constant, so that the color of the original artwork is basically consistent with the color of the screen and the color of coated rice paper printing. The choice of light source should consider the following two aspects: one is a better color temperature, the international standard standard will be the basic observation lighting recommended for the CIED50 standard light source that matches the sunlight spectral distribution of the relevant color temperature at 50000 K.

 

The second is a fluorescent tube with a higher display index, and the R value should be greater than 95% of the spectral display characteristics. In the experiment, the fluorescent tube display index of JUS company in Germany is 97%, which can completely reflect the true color of the illuminated object.

 

(1) Color management of the scanner

 

One of the key links of high simulation reproduction of art is to scan the original work, and obtain all the information needed from the original work at the beginning of scanning. This requires a calibration of the scanner.

 

The purpose of scanner calibration is to correct the brightness, contrast and black and white field of the scanning device, so as to ensure that when the scanner is initialized to zero, the same image data can be obtained no matter when scanning the same manuscript. To achieve this goal, the scanner characteristic file must be established. Scanner calibration and characterization file generation is performed with the help of 1T8.7/1 (standard transmission draft for scanning) or 1T8.7/2 (standard reflection draft for scanning) standard manuscript and scanner characterization file generation software. The following are the specific steps of scanner calibration and characteristic file generation with the help of scanner characteristic file generation software Scanopen.

 

1. Open the scanner and heat pipe 30 minutes in advance to ensure that the light tube reaches a normal and stable state.

 

2. Clean the glass of the flatbed scanner stage.

 

3. When using the flatbed scanner, pay attention to align the edge of the color card with the frame of the stage to prevent the scanning image from tilting.

 

4. Start the scanning application, clear all the color adjustment, control and management options of the scanner, set the scanner, and record the scanner setting status in detail.

 

5. Open Scanopen, click "Start generating feature file", select the whole color card according to the prompt box, and then click "Scan" button to scan the color card picture.

 

6. Check the "top left corner", "top right corner" and "bottom right corner" of the color card according to the prompts.

 

7. Click the "Create Feature File" button to create an ICC feature file of the scanner, and the feature file is completed.

 

8 Load test files and reference files: Open the color management application software again, enter the scanner color management option, input the digital image obtained by the scanning card, namely the test file, and then select the corresponding reference file in the reference folder, click the "Open" button, and send the selected reference file into the color management application software.

 

9. Create and save the profile: Click the "Create Profile" button to bring up the Save Profile dialog box.

 

(2) Color management of micro jet printer

 

For digital printing high simulation copy printing, careful color management of micro-jet printing is the key. Epson Stylus Pro 9800 inkjet printer + color management software + coated rice paper, silk color management of the whole system. Specific color management steps are as follows:

 

1. Basic linearization of inkjet printers

 

The basic linearization determines the physical characteristics of the pigment ink coated with rice paper, silk and oil painting cloth, and optimizes the total amount of ink jet and the amount of ink per channel of the inkjet printer. That is, using the best amount of ink to obtain the maximum color density as much as possible provides the basis and optimization characteristics for the creation of artistic micro-spray printing coated rice paper and silk ICC files to establish the basis of color management.

 

The principle of linearization of inkjet printer is to correct the deviation of printing color by checking and adjusting the density of all levels of micro jet machine. Therefore, the micro spray machine is first adjusted to the most stable working state. Through the use of GMG closed-loop correction technology by controlling the amount of ink jet printer to achieve the new printed color table color difference value and the initial color difference value is relatively uniform through the circular and accurate closed-loop correction of color to ensure a repeated and stable ink-jet printing system.

 

2. Carefully establish the ICC file after color space conversion. Based on the linearization file made and the measured ink amount, an ICC file to be converted in Photoshop software was generated through the Profile Maker color feature file generation software. This file is used to convert RGB format into CMYK format for inkjet printing, and print ECI 2002 color label of coated rice paper and other substrates, and then measure the chromaticity value LAB of 1485 color blocks by spectrophotometer to generate a new ICC file, which is the basic database of color management module for inkjet printer. Achieve the maximum color gamut of coated rice paper and other printing substrates. At this time, the accuracy of color restoration reaches about 90%.

 

3. Carefully build the final {CC file.

 

Due to the complexity of color in inkjet printing, ICC files generated by only one color space conversion cannot achieve accurate color restoration, local hue, local gray balance and color shift. Therefore, it is necessary to combine the experience, carefully modify and edit the ICC file after several color space conversion. This modification is fine and trace, which is an advanced finishing touch modification. This modification is one of the most important work of color management to make the accuracy of color reduction of micro-jet printing to a higher level.

 

After careful modification and editing, the excellent standard sample was printed, and the LAB value of 1485 color blocks was measured by Profile Make. The feature file generation software generates the final ICC file, so that the accuracy of color restoration reaches about 97%, so that the art micro-spray printing color restoration is extremely effective.

 

After the color management of the scanner and printer, and then scanning and printing the artwork, the accuracy of the color restoration of the original manuscript can be greatly improved to meet the requirements of actual production.