An appearance as of a halo of light, surrounding the edges of dark objects in a photographic picture.
A spreading or reflection of light, a halolike effect that occurs in reverse reading letters, where the background is significantly darker than the illuminated letters.
A term originally used in photography to denote the process by which the image in a developed emulsion is spread beyond the bounds of the incident light. Is used to describe the spreading of light from one order to the next in an échelle spectrogram.
In photography, an undesirable blurred effect that resembles a halo. It is usually found at the edges of highlights in photographs or around bright objects. It is caused by the reflection of light from the surface of the film or plate through the emulsion. See also EMULSION HARD DOT HICKEY HIGHLIGHT SOFT DOT
The distortion of copy generally caused in the plate-burning process because of foreign material under the film or insufficient vacuum draw-down. Halation is most noticeable in screens where it appears darker than the surrounding screen.
Spreading of light around the highlight in an image.
A defect of photographic films and plates. Light forming an image on the film is scattered by passing through the emulsion or by reflection at the emulsion or base surfaces. This scattered light causes a local fog which is especially noticeable around images of light sources or sharply defined highlight areas.
The fringe or halo which sometimes occurs around very heavily exposed image points as the excess light, penetrating the emulsion layer, is reflected back to the emulsion from the surfaces of the film base. It is reduced in modern films by dyeing the film base material itself or by the application of a dyed gelatin layer on the film back, called the anti-halation or anti-halo backing.
In photography, a blurred effect, resembling a halo, usually occurring in the highlight areas or around bright objects.
The spreading of light beyond its proper boundaries in a developed photographic image.
Phenomenon whereby light-colored glass surrounded by darkness prduces a blurred effect in which the light seems to spread beyond the boundaries of the glass.
Blurred effect at the edges of a highlight area of a photograph caused by reflection of light that passed through the film. The light is reflected from either the surface of the film or the camera back.
The production of diffused round bright spots in an image, by light reflecting from the back of the film-base. General film bases are given a light absorbing coat the anti-halation back to prevent this.
Is a diffused ring of light typically formed around small brilliant highlight areas in the subject. It is caused by light passing straight through the emulsion and being reflected back by the film base on the light sensitive layer. This records slightly out of register with the original image.