The difference between high fidelity printing and

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Analysis of the difference between high fidelity printing and high-definition printing

[China Packaging News] hi fi color printing is relative to four-color printing. It improves the reproducibility and authenticity of printing colors by adding red, green, blue, orange and other color inks on the basis of C, m, y, K four-color printing

high definition points refer to amplitude modulation points higher than 250lpi, that is, amplitude modulation points with 100% point diameter less than 125 m, and frequency modulation points with equivalent diameter less than 20 m. Aiming at improving the clarity of printed matter, printing with high-definition dots is called high-definition printing. Jinan experimental machine industry association was officially established on September 27, 2014. High definition printing technology can effectively reduce the distance between dots and improve the clarity and hierarchical performance of printed matter

the main features of high fidelity printing technology include three aspects: first, in addition to black ink, C, m, y and other added color inks participate in color separation and neutral gray balance; Second, the change of printing color tone is closer to the change effect of real spectral color than four-color printing, and the printed matter has a strong sense of hierarchy and stereo; Third, the printing color gamut increases. In four-color printing, due to the limitations of ink materials and production processes, the settlement of the ACTC R & D center is another good practice of in-depth cooperation between enterprises and the government. There is a large gap between the line and the spectral curve of the ideal color, and the printing color gamut is small

new color ink is added in high fidelity printing. When using high fidelity printing, users can adopt appropriate color adding schemes according to their actual situation, because different originals need to express different themes, and the color emphasis to be expressed is also different. For example, when printing raspberries, red and green are the focus of color expression. At this time, red and green can be added as the base color. The use of different ink combinations, the expansion of the color gamut is also different. For example, when printing with C, m, y and K plus R, G and B inks, the R, G and B of the secondary colors can be vividly reproduced, and the color gamut range has been significantly expanded

high definition printing technology is to improve the clarity of printed matter as much as possible. The quality of printed matter mainly depends on the number of points per unit area and the number of continuous change orders of points from small to large. The more points on the unit area, the higher the sharpness of the printed matter, the more the number of points changes, the better the hierarchical expressiveness of the printed matter, and the better the quality and appearance of the printed matter. However, the printing gamut will not be increased because the gamut is determined by the color of the primary color ink. As long as the primary color ink remains unchanged, the printing gamut will not change. At present, only high fidelity printing technology can really expand the color gamut of image printing, making the printing color brighter and brighter, which is closer to the real effect of nature

The key technology of high fidelity printing is color separation, that is, how to correctly decompose the colors in the original into different primary color components. At present, there are two commonly used color separation modes: one is to use the color conversion principle proposed by ICC (International Color Consortium), that is, to convert the original color into printing color separation through ICC profile, and the actual method is to look up the table. Compared with four-color separation, high fidelity printing requires a reasonable division of the hue interval of the color space, so that the ink color matching input color has the smallest homochromatic heterospectral index, and improves the matching accuracy. Second, by measuring the three stimulus values of CMYK four colors and RGB interchrome obtained by overprinting, the printing color separation value, that is, the point area ratio, is calculated by Neugebauer equation, which is a mathematical model. The goal of high fidelity color separation is to make the print color as close to the visual experience of the real scene as possible

the key technology of high-definition printing is the reduction of dot size and the appropriate arrangement of dots. Using FM dots for high-definition printing, the smaller the dots, the more points per unit area, and the better the hierarchical performance. FM plus prints have high definition, are not limited by the screen angle, and will not appear rose spots and moire like am points, which has obvious advantages. However, FM has large spatial resolution redundancy and low step resolution, so it is suitable for printing images with strong texture and rich details. When using am dot printing, you should choose a suitable dot layout to avoid rose spots. Am is suitable for printing images with fine color and light changes. At present, high-definition amplitude modulation can give full play to the potential of existing equipment and maximize the clarity and fineness of printed matter

high fidelity printing has anti-counterfeiting function. When printing, users choose different color adding schemes and color separation schemes according to their own conditions, so that the composition of printing ink has distinct uniqueness, and the printing color gamut is significantly different from that of conventional four-color printing. The process parameter data of color separation model and neutral gray model design is large, and each careful design will have a great impact on the printing effect, so users can have a special anti-counterfeiting scheme. If you add spot color, the anti-counterfeiting effect is very significant

high definition printing itself does not have anti-counterfeiting function. Because it uses the traditional four-color printing, as long as its printing characteristics are carefully analyzed and its production process is carefully studied, it is likely to produce similar products. Of course, if it is combined with other anti-counterfeiting measures, it is another matter

high fidelity printing breaks through the limitation of four-color printing gamut, making the printed matter have brighter and more realistic colors. High definition printing can improve the clarity and sense of hierarchy of products, making products appear more high-end. However, both of them put forward higher requirements for production technology and production technology. In particular, high fidelity printing requires 7-color printing, and the equipment investment, material cost and operation cost are very large. Users should choose between high fidelity and high definition printing according to their own conditions. In the future, with the progress of printing technology, high fidelity printing and high-definition printing with high added value will be commercialized

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