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Offset Printing

Photolithography, offset printing, litho-offset and offset lithography are synonyms in commercial printing for the most commonly used form of planographic printing, based on a modification of the lithographic press which uses a rubber covered cylinder which is located between the plate cylinder and the impression cylinder. The "plate" cylinder transfers the image from either an aluminum plate or a polymer based plate to the rubber "blanket" cylinder, which in turn offsets in onto the paper which is carried by the "impression" cylinder. Offset printing and other forms of planographic printing, through many technical refinements make possible increased production speeds, improved quality in fine tones and solids, and a vastly greater control on the quality of the final print as opposed to the process of photocopying.