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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.
The halftone effect is accomplished by photographing the subject through a wire or glass screen, which breaks the image up into a pattern of dots with sizes corresponding to the local brightness of the image; the larger dots create the darker areas, the smaller dots the highlights. The finer the screen, the finer the detail possible in the ...
Duotone (sometimes also known as Duplex) is a halftone reproduction of an image using the superimposition of one contrasting color halftone over another color halftone. [1] This is most often used to bring out middle tones and highlights of an image.
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.
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 ...
A major innovation was the development of halftone photography in the late 19th century. Halftone photography involves creating a reproduction of an original photograph by taking an image of it using a Photomechnical transfer camera (PMT), with a halftone screen as an intermediary tool to create gradation in the final reproduction. Halftone ...
A halftone dithering matrix produces a look similar to that of halftone screening in newspapers. This is a form of clustered dithering, in that dots tend to cluster together. This can help hide the adverse effects of blurry pixels found on some older output devices. The primary use for this method is in offset printing and laser printers. In ...
This effect shows fairly well in the picture at the top of this article. The grass detail and the text on the sign is well preserved, and the lightness in the sky, containing little detail. A cluster-dot halftone image of the same resolution would be much less sharp.