
In offset printing, the screen angle is the angle at which the halftones of a separated color is outputted to a lithographic film, hence, printed on final product media. ==Why screen angles should differ== In offset printing, colors are output on separate lithographic plates. Failing to use the correct set of angles to output every color may lead ...
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http://en.wikipedia.org/wiki/Screen_angle

In printing continuous tones (e.g. colours and greyscales) are simulated by patterns of dots, called screens. The rows of dots are applied at different angles less noticeable to the eye. In four colour printing these angles are: Black 45°, Cyan 105°, Magenta 75° and Yellow 90°
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http://www.encyclo.co.uk/local/20829

The angle at which the halftone screens are placed in relation to one another
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http://www.encyclo.co.uk/local/21048

The angle at which the halftone screens are placed in relation to one another.
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http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
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