American Heritage® Dictionary of the English Language, Fourth Edition
- n. A blurring or spreading of light around bright areas on a photographic image.
- n. A glow around a bright object on a television screen.
Century Dictionary and Cyclopedia
- n. In photography, the effect of excess of light, or of adventitious reflected light, on some part of a negative, as when an interior view includes a window the light-rays from which produce a fog which spreads over the neighboring parts of the picture, or when light is reflected from the back of the plate.
- n. The action of light surrounding some object as if making a halo.
- n. The blurring of light around a bright area of a photographic image, or on a television screen.
GNU Webster's 1913
- n. (Photog.) An appearance as of a halo of light, surrounding the edges of dark objects in a photographic picture.
- From halo + -ation. (Wiktionary)
- hal(o) + -ation. (American Heritage® Dictionary of the English Language, Fourth Edition)
“halation" of star photographs can be prevented by pouring over the back of the plate a film of collodion suitably stained.”
“My favorite is the strokes of halation as the sun peeks over the top.”
“Age tends to diminish night vision, especially the ability to distinguish contrast, and older drivers are vulnerable to what engineers call "overglow" or "halation," when letters lighted by headlights blur together.”
“For a moment the entire iron car was outlined in an eerie violet halation as the paint boiled up on the vehicle's surface, and all four tires melted.”
“The inside of the shade creates an elliptical shape and the strong white area in the top central portion is the light bulb which also gives off a halation creating the ‘bump’ on the top of this reflection.”
“The first advantage, which I soon discovered, is their entire freedom from halation.”
“This, with glass plates, is inseparable, and even when much labor has been bestowed on backing them, the halation is painfully apparent.”
“To avoid halation use portrait film, take the view where there are no glaring lights, and develop with Azol.”
“Chinese yellow is used largely in studios in place of white in make-up because it does not cause halation, which, to the picture people, is the bane of their existence.”
“Since the linen worn before the camera is dyed a faint tint to prevent the halation caused by pure white, it was a sure sign to me that he had spruced up a bit.”
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Looking for tweets for halation.