[hey-ley-shuh n, ha-]
- 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.
Origin of halation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for halation
Nor did the disturbing influence of the glare and halation of Kimberley only affect the vision of the diamond men within the town.
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.
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.
- photog fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film
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
- Blurring of the visual image due to glare from strong illumination.
- A blurring or spreading of light around bright areas on a photographic image.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.