Answer: halation

AnswerCrossword Clue
halationthe spreading of light beyond its proper boundaries in a developed photographic image
halationa blurring of light in photographs
halationbright ring that sometimes surrounds a bright object on a television screen
halationblurred 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