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The traditional halftone screening is what we often call AM screening. It consists of a series of regularly arranged dots that reflect the difference between highlights and shadows by changing the dot size. AM screening is highly predictive and works better on a press than random screening. The limitation of this technique is that the printer must ensure that the image does not lose dots in the brightest and darkest places. As the number of screen lines increases, it becomes more and more difficult to control the gap between the high-gloss dots and the dark-adjusted mesh.
　　
FM screening or random screening uses a completely different approach than AM screening, which maintains the same dot size but changes the distance between the dots. Since the dots are very small and closely arranged in many areas, FM screening can reproduce more detail (middle tone) while reducing the chance of "Mor" stripes appearing. Images printed with FM screening technology can often achieve the quality of continuous photo adjustment. However, since FM screening uses very small dots, the problem of high-gloss dots that often appear in the AM screening process also appears in most of the tone-adjusting. Before the advent of computer-to-plate technology, it was difficult to transfer micro-grids from film to plates, and now the problem can be easily solved.
　　
Many emerging screening technologies are a mixture of AM and FM screening. Hybrid screening uses traditional banner screening in most tonal regions, while FM screening is used in highlight and shadow regions. By mixing the screen, the offset printing factory can increase the number of screen lines in the AM range without placing an additional burden on the press. The following are some of the most recent screening products on the market (Agfa, ArtworkSystems, Esko, Fujifilm, Heidelberg, Kodak, Rampage, RIPit and Screen).
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Every printer believes that the computer-to-plate system can greatly improve the quality of the printing. Because it does not require the use of film, it is directly imaged on the printing plate, which makes the printing shop more tidy and allows people to use it more. Precise dots reduce the restrictions on the four-color printing that the press is exposed to. In addition, the computer-to-plate system can reduce dot distortion and maximize compensation for dot gain on the press. Under such a trend, many manufacturers have introduced random screening products for computer-to-plate systems.