halation

American  

[hey-ley-shuhn, ha-] / heɪˈleɪ ʃən, hæ- /

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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halation British  

/ həˈleɪʃən /

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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Etymology

Origin of halation

First recorded in 1855–60; hal(o) + -ation

Example Sentences

When viewed from several feet away, the dots coalesce into a halation of amorphous color.

From Los Angeles Times

When viewed from several feet away, the dots coalesced into a halation of amorphous color.

From Los Angeles Times

The same mixture makes an excellent backing for dry plates to prevent halation.

From Project Gutenberg

Plates already sensitized can be covered, rendered almost free from halation by painting the back or glass side with a mixture of collodion and rouge.

From Project Gutenberg

Mr. Russell, Government Astronomer of New South Wales, finds that the "halation" of star photographs can be prevented by pouring over the back of the plate a film of collodion suitably stained.

From Project Gutenberg