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(Photography) photog the act of manipulating a photograph so as to produce fewer tones and therefore create greater contrast
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
(or tone separation) Producing an image in which certain levels of grey tone are eliminated, using lith processing. This limits the range of tones for more graphic boldness.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited