Advantages and solutions of the hottest screening

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Advantages and solutions of plus Technology (Part 1)

in the printing industry, am and FM are not as simple as the wavelength of radio. In today's complex automatic prepress workflow, the hot topics discussed mainly focus on PDF, JDF, XML, CMS, ICC and other issues. Canada is no longer the technology that prepress experts pay most attention to

however, recent developments have shown that addition, as well as other ways of forming points, is still the most concerned issue for prepress workflow and output system manufacturers and sellers

important production tool

the advantage of optimization plus technology is to bring more vivid printing products, clearer details, no longer moire, and strengthen the stability of the process for the printing industry, while those enterprises that ignore this technology miss a very important production control tool

first, let's review the development of digital addition technology. It evolved slowly from the glass and contact screen used in the formation of simulation points. From the early stage of offset printing technology, printing process experts have been experimenting with point shape, angle and number of lines, hoping to optimize the effect of printing and control the process. Digital addition provides us with a possible way to form points in a physical way, so that the constraints on technology are no longer a problem

when DTP (desktop publishing) appeared, early postscript rip could realize four-color and multi-color digital addition, but its quality was lower than that of analog addition and digital addition of special high-end color system. Experienced prepress operators may remember the extensive and intense discussion on "plus" in the late 1980s

later, there was a revolutionary change in the composition of optimization points, providing more angle options than postscript level1. At the same time, prepress equipment manufacturers began to pay attention to postscript rip and apply their rich knowledge to desktop publishing systems

the real revolution is to adopt FM or random plus 7.5.5 total judgment, although it is not a new idea. In the 1980s, it has been applied to the digital printing process with low requirements for dot quality. It does not use dots of different sizes to simulate different continuous tones, but uses the interval between dots of the same size and relatively small to reproduce the tones

fm/random addition was launched at the time of the most intense war in Canada, and received a lot of advertising and expectations. Since then, the traditional addition method has been named am (amplitude modulation) addition to distinguish it from FM addition

clearer effect

compared with am, FM has the advantage of clearer effect, because tiny points can produce more tones; Ensure that there is no moire between colors and patterns, so as to make the printing process more stable. However, it has encountered many obstacles when applying f m plus to a wider range of non professional channels

the disadvantages faced in the early 1990s are: it is very difficult to process in the computer to film (CTF) environment, and there is no exposure range of the printing plate; Grain pattern will be produced in the gray middle tone and flat area; And it is difficult to compensate the color difference by using the method of ink thickness change on the printing machine. The operators who used this method in the early stage can insist on using it all the time

however, in the past decade, a small number of prepress and printing enterprises have begun to tacitly cooperate to use FM plus technology to produce high-quality prints. Those art books and high gloss Catalogue Products with objects prone to moire, such as textile images, pupil of speakers and architectural design, have benefited from FM plus technology and become a technology they are happy to use

simplify the process

because CTP technology simplifies the process, it plays an important role in the recovery of FM plus technology. In addition to the large-scale promotion and utilization of film, dust and registration problems have become some factors that hinder the development of FM technology

due to the adoption of CPT technology, there is no need to consider the film edge (thickness) or dust particles too much, so smaller FM points (usually 12 to 80 microns in offset printing, and 70 microns in flexo printing and newspaper printing, although China's mechanical products have a certain international comparative advantage) can be formed directly on the printing plate

Another advantage of CTP is that it can form harder dots on the thermal plate to obtain better printing effect. Particles composed of laser beams can form predictable additive points in imaging and printing. Any point edge composed of unfixed layers of the residual printing plate will not form an irregular printing effect

Creo strongly recommends the use of Turbo or spuarespot plus technology, which takes another step forward in hard spot quality. This technology adopts a higher resolution in the main scanning direction (exposure roller circumferential direction) than the direction to be scanned (direction above the drum), so as to improve the accuracy of adding points. Like the traditional one, all industries also restore the normal size point imaging in sequence (2400 × Compared with 2400dpi) technology, adding dots composed of more particles can obtain higher resolution effect (9, 600 × 2,400dpi)。

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