The spreading of light beyond its proper boundaries to form a fog round the edges of a bright image in a photograph or on a television screen.
- If these are indeed the causes of halation, then I see no reason why halation should not also take place in a paper emulsion.
- The Sabatier edge effects, which appear as white lines between areas of distinctly different densities, were proven (by Stevens and Norrish in 1937) to be the result of diffusion halation.
- This gives normal contrast range with highlight halation.
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