Theory and explanation of the hottest six color pr

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Theory and description of six color printing process (I)

in the past 10 years, four-color overprint reproduction has had a great impact on silk printing, and some complex design software and new silk plate making methods have appeared. The digital prepress process and printing equipment have also been greatly improved, which can accurately predict the quality of products, and the repeatability of products has also been guaranteed. However, due to the limitations of the four-color printing mode and the silk printing method itself, it is impossible to obtain the color completely consistent with the original

 in the past, the four-color overprint of color silk was completed by a monochrome printing machine, which could only print one color at a time, and then print the second color after drying until all four colors were printed. This makes the control of color very difficult to master. In recent years, due to the application of multi-color printing machine, the consistency and accuracy of color have been greatly improved. At first, two-color and four-color printing machines appeared, and now there are five color and six color printing systems

 here, we will introduce the scheme of six color overprint in two parts

<4-color overprint is an economically and technically acceptable mode. It is a widely recognized printing method, which can also realize the restoration of almost all colors. China has always been our strategic location. However, there are also many technical defects in four-color overprint

 although the image reproduction technology has been greatly improved in recent years, four-color reproduction is still an unstable process, which requires too many factors to be controlled. What's more, it produces moire and dot enlargement in printing, which leads to the final image either peaceful or too large contrast. In addition, with the four-color process, some visible colors cannot be copied

 therefore, it is difficult to carry out consistent quality control for four-color printing. On the printing press, the color may shift many times, even beyond recognition. This is caused by many environmental and physical factors. Some of the main factors are: the wear of the edge of the doctor blade, the change of the temperature of the printing machine, the change of the silk tension, the inconsistency of the ink performance (pigment accumulation and the change of viscosity and rheological properties), etc

 the degree of color reproduction effect depends on the color gamut range that the ink can print. From this point of view, four-color printing also has great limitations

5886. The six color overprint process is based on the traditional four-color overprint, which is obtained by expanding the standard four-color unit. But it is different from the hexagonal spot color process. The hexagonal spot color adds orange and green on the basis of CMYK, and the six color overprint mentioned here still contains only four colors of CMYK

 the six color system does not add two new colors, but uses their lighter and darker series instead of the standard cyan and magenta. Cmyklclm is used to represent six color overprint, where C and M represent dark cyan and dark magenta, while LC and LM represent the lighter colors of the two colors. The representation method also includes cmykc and flexible operation m or ccmmyk

 note that these names do not indicate the color order, they only indicate the hue of the color used in printing, and its allowable stress is based on tensile strength. This use of two different ink densities is called two field or two-color replication. It is a new change called n-channel color reproduction method, where n represents the number of colors used in printing

 there are several important advantages of using two-color extended overprint ink. The biggest advantage is that it greatly expands the range of color gamut. Epson and several other inkjet printers and ink manufacturers are using a process similar to this six color overprint to develop inkjet printers in order to obtain more realistic image colors. Inkjet printing has become a common digital substitute for film processors. Using low-grade inkjet printers can produce extraordinary results

 by adjusting the intensity and density of the colors used in printing, we can improve the appearance effect. The appearance effect is enhanced because the use of two colors reduces the contrast between colors. For example, when we have a very bright magenta and print the upper details with darker magenta, it may lose the darker points and enhance the image under the action of bright magenta. This method of achieving the overall effect of the image through halftone dots in the printing details is obviously a continuous joint development of new energy all aluminum passenger cars in terms of hue. POP display and other large design patterns for close viewing can get better results from this method

 using the six color process can not only improve the image clarity and resolution, but also improve the smoothness of excessive hues. Some colors that are difficult to obtain, such as meat color, barbecue food, water color, sky color, chrome yellow and similar metal colors, can be obtained by adding light tones in two-tone printing

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