Am Screening - 150 Lpi Elliptical Halftone Dot

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Note that the dots are non precisely the same at each percentage. In part, this is to avoid unmarried channel moiré. Also regime notation that inward the really calorie-free tones (as good every bit inward the darkest tones) every bit you lot piece of job past times away through the tones, sometimes at that spot are dots i pixel is size alongside gaps betwixt them which are together with then fill upward alongside to a greater extent than i pixel sized dots. Then piece of cake unopen to of the unmarried pixel dots piece of job past times away ii pixel dots mixed inward alongside the unmarried pixel ones. This is because a RIP volition merely picture amount private pixels to shape a halftone dot. So, inward the instance of a 2,540 dpi device, each pixel is 10 microns inward size (10.6 microns for a 2,400 dpi device). Therefore, if, for example, the the point diameter needs to survive fifteen microns inward size, since the RIP cannot picture a one-half a pixel to accomplish fifteen microns, instead the RIP volition alternate betwixt 1 pixel dots (10 micron) together with 2 pixel dots (20 micron) which results inward an effective fifteen micron point average for that note value.

The elliptical point shape attempts to avoid the "optical bump" at 50% seen alongside traditional Euclidean (round/square/round) dots past times splitting the indicate at which dots kickoff impact to 40% together with 60% rather than exclusively at 50%. While it's normally used, it is non an optimal point shape inward a CtP environment, due to the fact that private point shapes are unlike at each hide angle together with that they are directional inward nature. When used at depression frequencies (

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Using Fm Screening For Ink Savings

The average ink savings yesteryear switching from, for example, a 175 lpi AM/XM halftone to a xx micron FM halftone, is well-nigh 10-15% (depending on the hit of tones inward the master copy art). Since the average sheetfed printer volition pass well-nigh 3-4% of their gross lucre on ink, equally an example, for a $10,000,000 dollar a twelvemonth printer the ink savings using FM screening volition hit from well-nigh $35,000 to $52,500 a year. The reduction inward ink usage for the same terminal presswork appearance, comes primarily from the utilization of a cut-back flexure applied to the FM screened plate, the thinner ink cinema feature of FM screening, in addition to the higher percent of the tonality beingness created optically (optical dot gain) . How higher dot gain saves ink The smaller the halftone dot is, the greater its perimeter to expanse ratio is. Since dot gain occurs at the perimeter of the dot this results inward smaller dots having to a greater extent than dot ga...

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