At present, in the color management technology, the so-called color feature connection space is the color space of CIE1976Lab, and the color of any device can be converted into this space to form a "general" description mode, and then the color matching conversion . Within the computer operating system, the task of implementing color matching conversion is done by the "color matching module", which is reliable for color conversion and has important significance for color matching. So, how to achieve color transfer in the "universal" color space, to achieve loss of color or as little loss as possible? This requires each device to generate a profile, the color profile of the device. We know that when presenting and delivering colors, different equipment, materials, and processes can exhibit different characteristics. In color management, high-fidelity rendering of the colors presented on one device on another device requires us to understand the color rendering characteristics of the colors on various devices. Since the device-independent color space, CIE1976Lab chromaticity space, has been selected, the color characteristics of the device are expressed as: the correspondence between the description value of the device and the chromaticity value of the "universal" color space. A color description file for the device. Device color characterization file Among the color management technologies, there are three types of device color characterization files. The first type is the scanner profile, which provides standard originals for Kodak, Agfa, and Fujitsu, and standard data for these originals. These originals are entered using the scanner, and the difference between the scanned data and the standard original data reflects the scanner. The second type is the characteristic file of the display, which provides software to measure the color temperature of the display, and then generate a color block on the screen, which reflects the characteristics of the display; the third type is the printing device. The feature file, which also provides a set of software, which generates a graphic containing hundreds of color blocks in the computer, and then outputs the graphic on the output device. If it is a printer, the proof is directly printed, and the printing machine first outputs the film. , proofing and printing, measuring the output image reflects the characteristic file information of the printing device. The generated profile, that is, the color profile, is composed of three parts: the file header, the tag table, and the tag element data. A file header that contains basic information about the color profile, such as file size, type of color management method, version of the file format, device type, color space of the device, chroma space of the feature file, operating system, device manufacturer , color reproduction target, original medium, light source chromaticity data, etc., the file header occupies a total of 128 bytes. A tag table that contains information about the tag's quantity name, storage location, and data size, without the specific content of the tag. The tag's number name occupies 4 bytes, and each tag entry has 12 bytes. . The mark element data, which stores various information required for color management at a predetermined position according to the description of the mark table, and varies according to the complexity of the mark information and the amount of data of the mark. For the color profile of the equipment in the printing enterprise, the operator of the graphic information processing is obtained in two ways. The first way is to use the special profile creation software to generate the applicable color characterization files according to the actual situation of the existing equipment. The generated files are usually more accurate and more in line with the user's actual situation. As the state of equipment, materials, and process flows change or shift over time. Therefore, it is necessary to re-create the profile at intervals to adapt to the color response at the time. The second way is when the device is purchased, the profile provided by the manufacturer along with the device, which can meet the general color management requirements of the device. When the device application software is installed, the profile is loaded into the system. [next] Color is passed in the device Now let's take a look at how colors are passed on each device. First, for an original with a normal color, it is first scanned by a scanner. Due to the scanner's profile, the color (ie, the red, green, and blue tristimulus values) from the scanner is provided to the CIE1976Lab color. The correspondence of the spaces, and thus the operating system can obtain the chromaticity value Lab of the original color according to this conversion relationship. The scanned image is displayed on the monitor screen. Since the system has mastered the correspondence between the Lab chromaticity value and the red, green, and blue driving signals on the display, when displaying, instead of directly using the red, green, and blue chromaticity values ​​of the scanner, In the Lab chromaticity value of the previous document, according to the conversion relationship given by the profile of the display, a red, green, and blue display driving signal capable of correctly displaying the original color on the screen is obtained, and the display is driven to display the color. This ensures that the color displayed on the display matches the original color. After the operator observes the accurate image color display, the image adjustment processing can be performed according to the screen color according to the customer's request, and since the profile of the printing device is included, after the image separation, the correct color after printing can be observed on the display. When the operator is satisfied with the color of the image, the image is color separated and stored. When color separation, according to the color conversion relationship carried by the profile of the printing device, the correct percentage of dots is obtained. After RIP (Raster Image Processor), recording and printing, printing, proofing, and printing, a printed copy of the original can be obtained, thereby completing the entire process. 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