halation

[ hey-ley-shuh n, ha- ]
/ heɪˈleɪ ʃən, hæ- /

noun Photography.

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

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

Words nearby halation

Example sentences from the Web for halation

British Dictionary definitions for halation

halation
/ (həˈleɪʃən) /

noun

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

Word Origin for halation

C19: from halo + -ation

Medical definitions for halation

halation
[ hā-lāshən ]

n.

Blurring of the visual image due to glare from strong illumination.
A blurring or spreading of light around bright areas on a photographic image.