Introduction to the color management module in the

2022-07-24
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Introduction to the color management module in the color management system gatfworld magazine in July/August 1999 introduced some common color management modules in the current color management system to facilitate users' choice. Adobe cmm

adobe CMM is a private color management module of adobe products, such as Photoshop, illustrator, acrobat, InDesign, etc. in the pop-up menu of these software, it is displayed as a "build in" engine (i.e., a built-in engine). Adobe is considering not bundling its CMM with application software, but has not made a final decision

mark heisten, public relations manager of adobe printing technology, said that adobe developed CMM to ensure the consistency of color processing of its products. "Our product managers feel that since ICC is widely supported in the industry, it is important to support it with compatible ICC."

agfa cmm

Anja ruttyn, product support manager, introduced that Agfa has its own color conversion engine, which is used for color conversion between Agfa's private color feature description files before ICC specification release. This is known as color tags, which has been used in fototune software, fotolook scanner driver, Chromapress rip and other Agfa applications. She said that Agfa was entrusted with the strategic work of developing a color management system and did not hesitate to convert its private color conversion engine into CMM

agfa introduces that its CMM is designed to maintain the gray balance between scanned images and color separation. Agfa CMM supports variable, real-time computed GCR (grey component substitution). It also supports Pantone hexchrome six color separation

apple cmm

Steve swan, chief engineer of Apple's colorsync project, introduced that Apple hopes to launch CMM together with color image processing partners to help end users migrate from private systems to open workflow based on colorsync

apple includes three CMM in colorsync, Agfa, Heidelberg and Kodak, and takes Heidelberg's CMM as the default setting. Users can select their preferred CMM in the colorsync control panel, or select "automatic" to let colorsync select the CMM specified in the device properties file. For example, Heidelberg CMM is selected for the device characteristic file generated by Heidelberg printopen, and Agfa CMM is selected for the device characteristic file generated by Agfa colortune

Peter segin, senior manager of Heidelberg CMM

heidelberg prepress color management, said that the basic color technology of Heidelberg CMM was developed by Rudolph hell company. Later, hell merged with Linotype company to establish Linotype hell company, which was later integrated into Heidelberg group in 1997

hell first introduced the commercially available electronic color separator DC300 on drupa 1972. DC300 uses an analog computer, which can control the conversion from RGB to CMYK by the knob and scale on the control panel. Subsequent models use digital color computers (special circuit boards inserted in rows in the electrical sub chassis). With the progress of computer technology, the shell color computer can be put into an ASIC (application specific integrated circuit) integrated circuit, which has been used together with the Linotype shell electric extension until 1992

with the development of power Macintosh computer and its increasingly powerful RISC computer chip, the hell color computer can be written into a software core, known as the LinoColor CTU (color transform unit), which is a system extension of Macintosh OS. At that time, ICC was established, and Linotype hell actively supported the concept of open color management system, which enabled apple to adopt the color conversion algorithm of Linotype hell in colorsync 2.0

imation cmm

this summer, imation plans to launch a CMM called CFM color fidelity module. It can generate instant black version and is longer than the conversion from CMYK to CMYK. According to Chris edge, chief color scientist of imation, imation hopes to develop a CMM to support its matchprint analog proofing and rainbow digital proofing technologies. The difference between rainbow of dye thermal sublimation and matchprint of optical imaging leads imation to the road of color management in the exploration of color fidelity

other CMM only refer to CIELab color space when converting CMYK to CMYK. In this process, four color channels are converted into three color channels, and the black version channel information is lost. Imation's CFM not only computes CMY information to ensure chromaticity matching, but also retains the black channel information in the image

when four color gray is converted from CMYK to CMYK, conventional CMM will significantly change the ratio between basic color and black ink. In an example, we use a conventional CMM to convert a color of cmyk=605015 to CMYK under the same feature file, and the result is cmyk=5958680. However, the same conversion with imation's CMM will maintain the original ratio, that is, cmyk=605015

imation CFM also has the advantage that users do not need to use different ICC characteristic files when using different levels of UCR, GCR and black version generation. Imation CFM calculates the amount of black pages generated during the conversion process. Imation CFM provides a control board with which users can set UCR or GCR quantities, or use the quantities set in the ICC properties file. Nylon plastic used in the oil pan has a bright future in automobile lightweight. In our test of images, imation CFM obviously generates more saturated colors when converting from a large color gamut CMYK space (such as swap) to a small color gamut CMYK space (such as snap), and the same is true when converting in the opposite direction

people who use CFM for the first time will notice that its speed is quite slow compared with other CMM. This is because CFM needs to perform a lot of calculations like a color management characterization program to generate a color lookup table so as to convert from one color mode to another. The round corner of the support jaw: r1.0~1.5mm. The color lookup table is stored in the disk cache, and the subsequent conversion is much faster

imation predicts that the market for its CFM technology is for users who have to switch from one CMYK space to another, such as commercial printing to newspaper printing or vice versa. Dave Mayberry, program manager of imation color fidelity technology, said: "many advertisements are made for magazine printing (swop space). Now they can be converted to newspaper printing (SNAP space) without losing a small amount of information."

kodak cmm

kodak's color matching method was developed by eikonix in the early 1980s, which Kodak purchased in 1985. Eikonix was the first company to adopt a device independent approach to color management. Kathy Stein, a market strategy consultant of Kodak, said: "in the late 1980s, when our method of color management was widely adopted, other companies began to develop their own methods. The solutions are similar, but they still go their own way."

in the early 1990s, Kodak began to discuss with adobe, apple, sun and SGI on the definition of the general format of device characterization data, which is mainly reflected in the change of PTMC shape. Stein said, "we have defined the structure of describing matrix and lookup table data in CMM. These definitions become ICC specifications, which also means defining the behavior of ICC compatible CMM."

x-rite cmm

x-rite CMM was originally developed by ED Granger in light source computer images, a producer of colortron spectrophotometer, and the R & D bases of many large overseas chemical enterprises such as covestro and BASF are located here, using a color model called "external equivalence" (AEQA). Light source was acquired by X-Rite in 1997

according to Dave Hazlett, general manager of X-Rite image business department, X-Rite's current strategy is to transfer its CMM technology license to other companies. The CMM of X-Rite is realized by hexwrench, which is developed by study company and marketed by Pantone company. Hexwrench is used for six color separation of Pantone six color printing technology

conclusion

our research shows that users can choose one from a variety of CMM to convert RGB to CMYK color mode without worrying about the obvious differences between different CMM. High end color separators who require the best quality will use different CMM to do experiments and make their own judgment on the color separation effect, because slight and subjective differences do exist

when converting from the CMYK color of one device to the CMYK color of another device, imation CFM does have its advantages in maintaining the consistency of the black version channel and customizing UCR, GCR and black version generation before color separation

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