halation

ha·la·tion

H0018900 (hā-lā′shən)n.1. A blurring or spreading of light around bright areas on a photographic image.2. A glow around a bright object on a television screen.

[hal(o) + -ation.]

halation

(həˈleɪʃən) n (Photography) photog fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film[C19: from halo + -ation]

ha•la•tion

(heɪˈleɪ ʃən, hæ-)

n. a blurred effect around the edges of highlight areas in a photographic image. [1855–60; hal (o) + -ation]

Translations

alone fotografico

Halation

enUK

halation

[hā′lā·shən] (electronics) An area of glow surrounding a bright spot on a fluorescent screen, due to scattering by the phosphor or to multiple reflections at front and back surfaces of the glass faceplate. (optics) A halo on a photographic image of a bright object caused by light reflected from the back of the film or plate.

Halation

additional, uneven blackening (in black-and-white photography) or coloring (in color photography) that appears near the edges of the image on developed photographic materials. The most noticeable halation effect occurs in the photography of objects that are very bright or that have strong contrast. The halation effect decreases the gamma of photographic materials.

The main mechanism of the halation effect is similar to the mechanism of formation of an optical halo (see). The scattering of radiation in the light-sensitive emulsion causes the appearance of “flare spots” in the areas that were not directly illuminated by the incident light rays. The scattering occurs in the microcrystals of silver halides contained in the emulsion. Another cause of halation is the reflection of radiation that has passed through the emulsion; such radiation may be reflected by the back boundary of the emulsion or by the substrate. In modern photographic materials one side of the substrate is coated with an absorbent (antihalation) layer to reduce such reflection.

单词	halation
释义	halation enUK ha·la·tion H0018900 (hā-lā′shən)n.1. A blurring or spreading of light around bright areas on a photographic image.2. A glow around a bright object on a television screen. [hal(o) + -ation.] halation (həˈleɪʃən) n (Photography) photog fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film[C19: from halo + -ation] ha•la•tion (heɪˈleɪ ʃən, hæ-) n. a blurred effect around the edges of highlight areas in a photographic image. [1855–60; hal (o) + -ation] Translations alone fotografico Halation enUK halation [hā′lā·shən] (electronics) An area of glow surrounding a bright spot on a fluorescent screen, due to scattering by the phosphor or to multiple reflections at front and back surfaces of the glass faceplate. (optics) A halo on a photographic image of a bright object caused by light reflected from the back of the film or plate. Halation additional, uneven blackening (in black-and-white photography) or coloring (in color photography) that appears near the edges of the image on developed photographic materials. The most noticeable halation effect occurs in the photography of objects that are very bright or that have strong contrast. The halation effect decreases the gamma of photographic materials. The main mechanism of the halation effect is similar to the mechanism of formation of an optical halo (see). The scattering of radiation in the light-sensitive emulsion causes the appearance of “flare spots” in the areas that were not directly illuminated by the incident light rays. The scattering occurs in the microcrystals of silver halides contained in the emulsion. Another cause of halation is the reflection of radiation that has passed through the emulsion; such radiation may be reflected by the back boundary of the emulsion or by the substrate. In modern photographic materials one side of the substrate is coated with an absorbent (antihalation) layer to reduce such reflection. halation enUK halation [hah-la´shun] indistinctness of the visual image caused by strong illumination coming from the same direction as the object being viewed. ha·la·tion (hă-lā'shŭn), Blurring of the visual image by glare. ha·la·tion (hă-lā'shŭn) Blurring of the visual image by glare. Halation enUK Halation 1. In photography, blurred lines due to light. When done deliberately, halation may call attention to a certain part of an image. This may be used in advertisements or other forms of marketing. 2. See: Blooming. AcronymsSeeHALO
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