Talking about the color management of silk digital printing
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In the 1990s, Austrian ZIMMER first realized digital inkjet printing technology on carpets, and in 1992 exhibited the first generation of digital inkjet printers for textiles. With the continuous development and development of digital inkjet printing technology, with its flexible and fast advantages, it has a place in the printing market and its development speed is rapid. Hangzhou Wanshili Silk Digital Printing Co., Ltd. (hereinafter referred to as “Wanshili”) has been engaged in silk weaving, printing and cultural and creative industries since 1976. The silk digital printing center established in 2008 is the leader in the silk digital printing industry. However, due to the complexity of digital inkjet printing processes, materials and equipment, how to ensure the accuracy, predictability and repeatability of printing color effects is a problem that plagues silk digital inkjet printers. Therefore, in order to ensure high quality, high reliability and repeatability of silk digital inkjet printing, color management for silk digital inkjet printing is imperative.
Color management goals and meaning
The so-called color management refers to the use of the combination of software and hardware to automatically manage and adjust the color in the production system to ensure the consistency of color throughout the production process.
In view of the current color separation process, the color adjustment cycle, the color volatility of the production process, the digitization of the process and the imperfect process control system in the digital printing process, Wanshili adopts international advanced Standardized test methods and colorimetric evaluation methods, color correction of scanners, displays and digital printers and generation of color characteristics ICC files, through the monitoring of the entire production process, the construction of a color management system, the system to solve the company's digital Various bottleneck problems in printing, to achieve the best match between customer sample and printed products - "what you see is what you get", to achieve digital quality control, to achieve color consistency of printed products from scanning, color separation, and mapping to finished products Reduce the working time and material waste of each link and improve the production efficiency and competitiveness of the enterprise.
Necessary conditions for implementing color management
1. Ensure the stability and consistency of the production system
On the basis of collecting the basic data of the quality standard parameters of each process in the digital printing production process, by establishing a digital printing standard digital process control system, standardizing the quality standards and parameters of its production process control, focusing on solving the problem between multi-material and multi-device The color separation method and data matching problem improve product quality and consistency, and provide guarantee for the construction of color management platform.
2. High precision color measurement
MasterCard uses the internationally advanced color measuring instrument Color Eye XTH to collect spectral data of various models and inks reproduced on various fabrics, greatly improving the accuracy of color data, conforming to standard color measurement, ensuring color Management is implemented smoothly.
3. Build a color evaluation platform
The scientific and reasonable color evaluation platform is an important part of color management. It is mainly composed of observation light source, angle and surrounding environment, and the color deviation is evaluated by color difference. The scientific and reasonable evaluation platform solves the environmental observation and evaluation of sample, material, display and product color.
Digital printing color management technology implementation elements (4C)
Color management must follow a set of prescribed procedures to achieve the desired results.
1. Equipment calibration (Calibration)
Device calibration is the first step in color management. Equipment calibration is the basis for the color rendering of the device as a feature description. Equipment calibration must be performed before the color data conversion of different devices, including input device calibration, display calibration, and output device calibration. Through calibration, it is determined that the same device has consistency and repeatability in the process of acquiring and transmitting color information in different time, so that each device in the image system can be colored according to its corresponding coloring manner.
2. Device characterization (Charact-erization)
Device characterization is the core of color management. When all devices are calibrated, it is necessary to record the color characteristics of each device. This is the device characterization process. Each device in a color desktop system has its own color characteristics, and in order to achieve accurate color space conversion and matching, the device must be characterized. For input devices and displays, using a known standard chromaticity value table (such as the IT8 standard color scale), the chromaticity characterization curve of the device is made against the chromaticity values of the table and the chromaticity values produced by the input device. For the output device, the output color gamut characteristic curve of the device is made using the color space. On the basis of making the input device characteristic curve, the color description file of the input device is made according to the device-independent color space; at the same time, the color description file of the output device is made by using the color gamut characteristic curve of the output device, and these description files are used. It is a bridge from the device color space to the standard device-independent color space.
3. Color conversion matching (Con-version)
The conversion of colors between different device profile files is the key to color management. Based on the calibration of the devices in the system, the device description file is used to implement the correct conversion between the color spaces of each device by using the standard device-independent color space as a medium. Since the color gamut of the output device is narrower than that of the original, scanner, and display, the color gamut needs to be compressed during color conversion. The color gamut compression proposes four methods of reproduction intent in the ICC protocol: perceptible and saturated. Chroma, relative chroma, absolute chroma.
4. Color matching check (Check)
After completing 3C (Calibration, Characterization, Conversion), the color matching is the main reference indicator for judging whether color management is successful. We use the color difference commonly used in the world to check the color matching result.
The digital process control of the production process is guaranteed
The silk digital printing process refers to the production chain that forms the production task organization, work information transmission, equipment and materials of digital printing products. Figure 1 is a flow chart of the production process of Wanshili. Production process control is the analysis, diagnosis and monitoring of the operation technology and production process adopted to ensure that the production process is in a controlled state, which directly or indirectly affects the production, installation and service processes of product quality.
The digital printing system has various process flow, complicated process and poor equipment stability, which often leads to poor color repeatability and color consistency of digital printing products. This is a technical problem of digital printing technology at home and abroad. In view of the color instability problem in silk digital printing, the digital process control of the production process is guaranteed. To this end, based on the analysis of the silk digital printing production process, Wanshili monitors the entire operation process and optimizes the key control nodes by establishing a digital printing process control system and corresponding basic database, thereby realizing standard digital process control and improving product color. consistency. Figure 2 is an analysis of the main points of the Wanshili digital printing process control.
Conclusion
Color management is the biggest problem in the digital printing process of silk. MasterCard uses internationally advanced standardized test methods and colorimetric evaluation methods to color correct scanners, monitors and digital printers and generate color-characteristic ICC files. By monitoring the entire production process, digital color is input. The stability and repeatability transmitted between the output device and the mainstream digital test method are used to describe the technical process and process status of the company's digital printing production. The basic data of the digital process and the related mathematical methods are used for dynamic analysis. To provide data support for the optimization of basic data and control data, and finally form a digital control system that realizes color reproduction by establishing a three-level color management and control system for companies, workshops, and teams with prevention as the core.