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halation

[hey-ley-shuh n, ha-]
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noun Photography.
  1. a blurred effect around the edges of highlight areas in a photographic image caused by reflection and scattering of light through the emulsion from the back surface of the film support or plate.
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Origin of halation

First recorded in 1855–60; hal(o) + -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for halation

Historical Examples

  • Nor did the disturbing influence of the glare and halation of Kimberley only affect the vision of the diamond men within the town.

    A Handbook of the Boer War

    Gale and Polden, Limited

  • As at Sannah's Post, so again at Lindley the halation of a word or two in his orders fogged the image on his retina.

    A Handbook of the Boer War

    Gale and Polden, Limited

  • Halation is the term used to denote the spreading of light beyond its proper place on the negative.

  • The first advantage, which I soon discovered, is their entire freedom from halation.


British Dictionary definitions for halation

halation

noun
  1. photog fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film
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Word Origin

C19: from halo + -ation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

halation in Medicine

halation

(hā-lāshən)
n.
  1. Blurring of the visual image due to glare from strong illumination.
  2. A blurring or spreading of light around bright areas on a photographic image.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.