In traditional printing, color platemaking is performed by an electronic color separation machine. Since the electronic color separation machine is closed, that is, the input from the color scan head to the recording head is completed at one time, there is no problem of color management. With the development of computers and external devices, a color desktop publishing system has emerged. Images are input to computers through input devices of scanners, video cameras, and other manufacturers. Words are entered in computers, image processing is performed, images are mixed, etc., and then passed. Graphic output machine output not only improves the quality, but also is convenient and quick to use. Therefore, the use of computer color image processing system has been rapidly popularized and promoted. With the development of communication technology and network technology, now has entered a new era of color desktop publishing. Color scanners, digital cameras, PHOTO CD images, digital proofing, and direct plate making have all been widely used in the printing industry.
The color desktop publishing system is an open system. The system is flexible and flexible. That is, it can use scanners produced by Party A, use displays produced by Party B, use imagesetters, printers, etc. produced by C. The devices are combined into one system. In this system, from the scanner's original input to the proofing and finished product output, the color consistency is maintained, and the quality control of the image color is crucial.
In practice, it is often found that the color seen in the display is very different from the color in the printed matter. Different scanners scan the same image to obtain different color image data; different models of the display show the same image, but also have different Display results; the same image, with a color printer with a large color gamut output is satisfactory, and when printed out, the color is gray and so on, these are due to the different characteristics of the color reproduction of various devices, that is to say Color is device-related. Therefore, there is a need to establish a color management mechanism that transfers colors in a device-independent manner so as to ensure reliable color transfer and make color reproduction independent of the device used.
Let's take a look at the steps of color management.
The first step in color management - calibration
Calibration means adjusting the instrument to the standard. All instruments must be calibrated before use to ensure proper instrument performance.
Color Management Step 2 - Characterization
The so-called characterization refers to each color input or color output instrument, even color materials (such as ink, display screen, chemical phosphor, etc.), have a certain range of color or color performance. The purpose of this step is to establish the range of color representation of the instrument or material and record its characteristics mathematically for color conversion.
The third step of color management - conversion
Conversion refers to the color conversion between instrument and instrument or instrument and material or material and material. Each instrument or material has a different color range, for example, the color display is RGB color, and the color printing is CMYK color; and the color range of different brands (even the same brand) of the color display screen may not be the same, the same different manufacturing The color range of the four-color inks may also be different. The color conversion in color management is not to provide 100% of the same color, but to use the instrument or material to provide the best color, while allowing users to predict the results.
It can be seen that from a printing point of view, color management should always be involved.
Color is often used as a receiving standard for production. Many companies lose important customers because of color issues. It can be seen that mastering the laws of color presentation and controlling color quality are the technologies that must be mastered in production and production. Otherwise, with advanced equipment alone and without good technical cooperation, it will eventually lose its capital in the fierce market competition.
Source: Weihai City, Shanxi big technical schools Author: Ma Xiaowen
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