Comparison and selection of screening methods for

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The comparison and selection of pre press processing addition methods

addition methods have been added from the initial photography to the current laser electronic addition, and have successively formed rational lattice, irrational lattice and composite lattice addition techniques

I. amplitude modulation plus (SAM)

amplitude modulation plus technology is based on the grid center element, the center distance of adjacent two points remains unchanged, the arrangement of points follows a certain law, and the point shape is a artificially designed point type that can significantly reduce the grinding thermometer. The size of the pixel value controls the size of the point area. It changes the size of the points to express the depth and shallowness of the image hierarchy when the number of added points remains unchanged

computer amplitude modulation and electronic color separation machine processing technology will also provide an inexhaustible driving force for the extruder industry. The technology is basically the same. The fine adjustment of point shape and the algorithm of point shape adjustment are the difficulties in amplitude modulation and amplitude addition technology

in short, due to the regular distribution of points, it is easy to produce interference fringes when amplitude modulation is applied to multicolor overprint, so the screen angle of the color separation plate must be strictly controlled

second, FM plus measures the length of the two diagonals of the indentation (SFM)

FM plus technology refers to some particle dots as independent pixel units. They are randomly distributed in a specific unit area, and their area varies according to different calculation methods

compared with am plus, FM plus has many advantages. It has excellent development prospects in offset printing, flexographic printing, printing and other fields. However, due to the small inking point of FM, there are high requirements for the adaptability of paper, ink and equipment, and there are problems in the promotion and application

III. high fidelity color processing technology

in order to further improve the level of printing technology, improve the resolution of printing equipment, give full play to the advantages of computer plate making technology, and fundamentally improve the reproduction quality of printed matter. Then came the high fidelity color processing technology. High fidelity point is a new standard set for frequency modulation point technology, which is a pure software method. High fidelity color adopts frequency modulation points and uses more than four-color color separation technology, which has significant improvements in color reproduction range, printing density, clarity and level compared with four-color addition technology. High fidelity processing technology is the mainstream of processing technology in the future

reprinted from: printing industry channel

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