Analysis of Art Screening Technology

Screening technology is the basic way to reproduce continuously adjusted images, and it is also an important technology that determines the quality of printing. It has a history of more than 100 years in the printing field. Networks and other development stages, and formed rational screening, irrational screening, super cell structure screening and frequency modulation screening technology. At present, AM screening and FM screening have always played a leading role as the two mainstream screening technologies. With the advancement of science and technology, some special screening technologies have emerged continuously, and they have been used in certain printing fields and have different uses Prints.

Hybrid Screening Technology

It is well known that amplitude modulation screening reproduces the image tone and gradation by fixing the dot pitch and changing the dot size, which has obvious advantages in the restoration of the image midtones. FM screening reproduces the image tone and gradation by fixing the dot size and changing the dot pitch, which can restore the details of the image well. Hybrid screening technology is a new screening technology developed by combining the advantages of AM screening and FM screening.

Hybrid screening is developed based on the principle of digital screening and computer control technology. The principle is to generate FM dots in the high-tone and dark-tone parts of the image, and the mid-tone part simulates the amplitude modulation dot configuration, that is, to maintain a certain dot At the same time, the tone reproduction can be achieved by changing the size of a single dot. The hybrid screening technology makes full use of the advantages of FM screening while maintaining the good printability of the AM dots. Therefore, the hybrid screening technology can achieve a good image reproduction effect.

This kind of dots use the amplitude modulation dots as the skeleton and the frequency modulation dots as the decoration. The shape of the dots is different, and the positions are slightly randomly distributed, which has the characteristics of amplitude modulation and frequency modulation dots. The advantage of hybrid screening is that there is no problem of dot angle and direction, reducing low-frequency components to reduce the graininess of the picture, and reducing high-frequency components to improve printing stability. Therefore, the printability of mixed dots is better than that of AM dots and FM dots.

Art Screening Technology

The basic principle of the art screening technology is to replace the conventional dots with various shapes or patterns to achieve the purpose of reproducing the tone and level of the image. The dot shape commonly used in ordinary screening techniques is generally circular, elliptical, rhombic, or square, etc. The formation of the dot shape is controlled by the dot function. According to the Postscript screening principle, adjusting the mathematical model of the dot function can flexibly control the shape of the dot, which is the mathematical theoretical basis of the art screening technology.

Art screening is to describe the outline of a graphic or pattern as a dot according to a certain algorithm, and then use expansion, reduction or other nonlinear transformation algorithms on the outline to make the outline curve correspond to the gray value of the image, and finally use the outline to describe The graphics or patterns complete the screening of the image. In the high-key part of the image, the edge of the dot outline appears fish-shaped; the dark-tone part adopts reverse dots, and the outline of the blank part appears as a goose shape; The mathematical model for changing the shape of the control dots can change the fish shape and the goose shape into other shapes, such as various line patterns, to enrich the types of artistic screening.

Art screening technology is most suitable for large-scale outdoor posters and posters. People can see the overall image effect of the picture from a distance, and they can learn the special information hidden in the network from a close distance. In addition, anti-counterfeiting printing is also suitable for the use of artistic screening, printing micro-text or icons (trademarks) as dot shapes in the image. Because the dot contour algorithm is unique, it can play a certain anti-counterfeiting role. Use microtext to replace the anti-counterfeit image printed after the dots. With the help of a magnifying glass, you can clearly see the small text hidden in the image, so as to identify the authenticity.

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