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Color restoration issues often occur in the production of color box packaging products, such as neutral gray color deviation, which affects product quality. In addition to the equipment itself and the technical level of production personnel, the key issue is that the enterprise has not been able to effectively manage colors and use ink reasonably. Color management refers to the management of people's perception of color, with the aim of completing the conversion between different colors throughout the entire process of image reproduction, to ensure that the appearance of image colors from input display to output display can match as much as possible, and ultimately achieve the consistency of the original and copied colors.
Color restoration issues often occur in the production of color box packaging products, such as neutral gray color deviation, which affects product quality. In addition to the equipment itself and the technical level of production personnel, the key issue is that the enterprise has not been able to effectively manage colors and use ink reasonably.
Color management refers to the management of people's perception of color, with the aim of completing the conversion between different colors throughout the entire process of image reproduction, to ensure that the appearance of image colors from input display to output display can match as much as possible, and ultimately achieve the consistency of the original and copied colors.
Image replication involves multiple stages such as image acquisition, processing, color separation, and printing. At each stage, color information will be displayed according to the color rendering principles and color description features of the equipment used at that time. Inconsistent scanning and display devices may display inconsistent colors on the same original document. In addition, the color expression between RGB three color display screens and four color printing ink is not consistent. In addition, the use of inconsistent RGB data conversion into CMYK also lacks consistency. The use of inconsistent paper and ink results in different printed products. Therefore, it is necessary to control the color recovery on various devices and media in the production system through color management skills.
Content of color management
The establishment of a device's color description file (Profile) is the middle of color management. The description file contains representative color features of each device, such as chromaticity characterization curves, excellent color gamut feature curves, etc. The color management system uses these representative color features to complete the matching and conversion of color spaces for each device.
To achieve the expected results, it is necessary to follow a series of polite operating procedures for color management. Color management is theoretically divided into three methods, abbreviated as "3C", namely calibration, characterization, and conversion.
Calibration: In order to ensure the invariance, scalability, and sustainability of color information transmission process, it is required to calibrate input, display, and output devices to ensure that they are in a standard obligation shape. Input correction includes brightness, contrast, and noise correction for scanners, etc. To ensure that the same image data can be obtained regardless of the scanning time for a consistent original.
By setting the brightness, contrast, color temperature, and gamma value of the entire display system of the display, it can accurately display colors. Output calibration includes the calibration of printers, imagesetters, printing machines, and proofing machines, and after correcting their features, enables the equipment to output according to the standard features at the factory.
Characterization: Recording the corrected features of all devices is the process of characterization. These feature description files serve as a bridge for transitioning from device color space to standard device independent color space (PCS).
Conversion: On the basis of calibrating the system equipment, use device description files and use standard device independent color spaces as the preface to achieve precise conversion between device color spaces. Due to the color gamut of the output device being higher than that of the original, scanner, and display
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