Halation n. : An appearance as of a halo of light, surrounding the edges of dark objects in a photographic picture.

Example:
What is a Halation Ring, and when and where can I see one?

Taxonomy
halation, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, glossary, english, language, ESL, Etymology, halo, boundaries, photographic image, bright ring, surrounds, bright object, television screen.

Defination from the web:
halation from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Home. Visit Our Sites. Unabridged Dictionary. Learner's Dictionary. Word Central for Kids. Premium Services. Unabridged Dictionary. Encyclopedia Britannica ...