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Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect. [1] "Halftone" can also be used to refer specifically to the image that is produced by this process.
Traditional amplitude modulation halftone screening is based on a geometric and fixed spacing of dots, which vary in size depending on the tone color represented (for example, from 10 to 200 micrometres). The stochastic screening or FM screening instead uses a fixed size of dots (for example, about 25 micrometres) and a distribution density ...
Halftone prints (as produced with inkjet and offset printers), traditional film, and digital screens are not truly continuous-tone since they rely on discrete elements (halftones, grains, or pixels) to create an image. [5] However, the term applies when the appearance is so smooth that the breaks or gaps between tonal values are imperceptible. [6]
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Dot gain, or tonal value increase, is a phenomenon in offset lithography and some other forms of printing which causes printed material to look darker than intended. It is caused by halftone dots growing in area between the original printing film and the final printed result.
A Scene in Shantytown, New York, The Daily Graphic, March 4, 1880. Stephen Henry Horgan was born in Norfolk, Virginia on February 2, 1854. [1] [2]The half-tone method he invented was to use a glass screen with fine lines in it which translated the gradations of an image when placed between a light-sensitive metal plate and a negative.