[haf-tohn, hahf-]
Also called middle-tone. (in painting, drawing, graphics, photography, etc.) a value intermediate between light and dark.
a process in which gradation of tone in an image is conveyed by first photographing the image through a screen to break up the continuous tones of the image into minute, closely spaced dots, then using the print obtained to produce a metal plate by photoengraving, and finally using the plate to reproduce the original image by letterpress or offset printing.
the metal plate used in such a process.
the print obtained in such a process. Compare line cut.
pertaining to, using, used in, or produced by the halftone process: a halftone screen; a halftone print.

1645–55; half + tone

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World English Dictionary
halftone (ˈhɑːfˌtəʊn)
1.  a.  a process used to reproduce an illustration by photographing it through a fine screen to break it up into dots
 b.  the etched plate thus obtained
 c.  the print obtained from such a plate
2.  art a tonal value midway between highlight and dark shading
3.  (US), (Canadian) music another word for semitone
4.  relating to, used in, or made by halftone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Computing Dictionary

halftone definition

The reproducion of greyscale images using dots of a single shade but varying size to simulate the different shades of grey.
Laser printers that cannot print different sized dots, halftones are produced by varying the numbers of dots in a given area.
This process is also used to produce a black and white version of a colour original using shades of grey in place of colours.
See also device independent bitmap.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The magazine's editors shot the map in an on-site studio utilizing halftone, an early photographic technology.
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