halationn.

Brit.

/həˈleɪʃn/, U.S.

/həˈleɪʃ(ə)n/,

/heɪˈleɪʃ(ə)n/

Etymology: < halo n. + -ation suffix.

1. Photography. A halo-like effect in which light spreads beyond the edges of a bright object in a photograph, and which is principally caused by light striking the back surface of the base supporting the photographic emulsion and reflecting back into the emulsion at an angle, or by scattering of light within the emulsion itself.

ΘΚΠ

society > leisure > the arts > visual arts > photography > a photograph > qualities and effects > [noun] > indistinctness

veil1853

fogging1854

fog1856

halation1859

veiling1864

red fog1873

light fog1880

fuzz1889

soft focus1919

graininess1921

irradiation1924

unsharpness1961

1859 G. W. Perry Let. 12 Sept. in Photogr. Jrnl. 15 Nov. 91/2 The peculiar appearance (to which, until a better one is found, I have applied the term, ‘halation’) gives place to pure rich blacks, which contrast strongly with the brilliancy of the whites.

1881 Athenæum No. 2826. 857 Papers read: ‘Halation’, by Capt. Abney. This was shown not to arise from any turbidity in the glass, but from light being reflected from the back of the plate.

1916 J. Bernique Motion Picture Acting 182 White material, if starched or of silken sheen, will almost invariably produce halation. For this reason most studios avoid white in costumes.

1957 E. S. De Maré Photography vii. 152 In the case of an east window in a church, halation can only be avoided entirely by lighting the interior wall around the window, so reducing the contrast.

2010 J. A. Okun et al. VES Handbk. Visual Effects vii. 658 As a rule of thumb all effects that occur once light hits a camera lens should be done in the composite, which means that lens flares, blooms, halation, chromatic aberration of the lens, and the film's grain pattern should not be rendered.

2. An effect consisting of a series of halos of diminishing brightness surrounding the edges of a bright image on the screen of a cathode ray tube display, caused by internal reflection of the image-forming rays within the screen. Also: the reflection itself.

ΘΚΠ

society > communication > broadcasting > television > visual element > [noun] > television picture or image > defects in

multiple image1863

ghost1927

flicker1933

ion spot1936

halation1937

blooming1940

shading1940

misregistration1942

snow1946

snowstorm1948

ringing1949

streaking1956

strobing1961

flickering1968

1937 A. T. Witts Television Cycl. 56 Halation, the reflection of image rays by the back of a screen or film. Such reflection produces a blurring of the image as viewed by the observer, or is reproduced on the film.

1940 D. G. Fink Princ. Television Engin. iii. 72 The brightness contrast is limited by halation and saturation of the luminescent screen and by the defocusing effect (‘blooming’) associated with the electron gun when large signals are impressed upon it.

1958 Chambers's Techn. Dict. Suppl. 983/2 Halation, bright annular area around the cathode-ray tube phosphor spot, arising from internal reflection within the glass support.

2003 K. Compton Image Performance CRT Displays v. 47 Add in veiling glare, halation, and other inherent distortions that make the pixel larger, and the ideal pixel shape becomes awash in unwanted luminance energy.

This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022).

单词	halation
释义	halationn. Brit. /həˈleɪʃn/, U.S. /həˈleɪʃ(ə)n/, /heɪˈleɪʃ(ə)n/ Etymology: < halo n. + -ation suffix. 1. Photography. A halo-like effect in which light spreads beyond the edges of a bright object in a photograph, and which is principally caused by light striking the back surface of the base supporting the photographic emulsion and reflecting back into the emulsion at an angle, or by scattering of light within the emulsion itself. ΘΚΠ society > leisure > the arts > visual arts > photography > a photograph > qualities and effects > [noun] > indistinctness veil1853 fogging1854 fog1856 halation1859 veiling1864 red fog1873 light fog1880 fuzz1889 soft focus1919 graininess1921 irradiation1924 unsharpness1961 1859 G. W. Perry Let. 12 Sept. in Photogr. Jrnl. 15 Nov. 91/2 The peculiar appearance (to which, until a better one is found, I have applied the term, ‘halation’) gives place to pure rich blacks, which contrast strongly with the brilliancy of the whites. 1881 Athenæum No. 2826. 857 Papers read: ‘Halation’, by Capt. Abney. This was shown not to arise from any turbidity in the glass, but from light being reflected from the back of the plate. 1916 J. Bernique Motion Picture Acting 182 White material, if starched or of silken sheen, will almost invariably produce halation. For this reason most studios avoid white in costumes. 1957 E. S. De Maré Photography vii. 152 In the case of an east window in a church, halation can only be avoided entirely by lighting the interior wall around the window, so reducing the contrast. 2010 J. A. Okun et al. VES Handbk. Visual Effects vii. 658 As a rule of thumb all effects that occur once light hits a camera lens should be done in the composite, which means that lens flares, blooms, halation, chromatic aberration of the lens, and the film's grain pattern should not be rendered. 2. An effect consisting of a series of halos of diminishing brightness surrounding the edges of a bright image on the screen of a cathode ray tube display, caused by internal reflection of the image-forming rays within the screen. Also: the reflection itself. ΘΚΠ society > communication > broadcasting > television > visual element > [noun] > television picture or image > defects in multiple image1863 ghost1927 flicker1933 ion spot1936 halation1937 blooming1940 shading1940 misregistration1942 snow1946 snowstorm1948 ringing1949 streaking1956 strobing1961 flickering1968 1937 A. T. Witts Television Cycl. 56 Halation, the reflection of image rays by the back of a screen or film. Such reflection produces a blurring of the image as viewed by the observer, or is reproduced on the film. 1940 D. G. Fink Princ. Television Engin. iii. 72 The brightness contrast is limited by halation and saturation of the luminescent screen and by the defocusing effect (‘blooming’) associated with the electron gun when large signals are impressed upon it. 1958 Chambers's Techn. Dict. Suppl. 983/2 Halation, bright annular area around the cathode-ray tube phosphor spot, arising from internal reflection within the glass support. 2003 K. Compton Image Performance CRT Displays v. 47 Add in veiling glare, halation, and other inherent distortions that make the pixel larger, and the ideal pixel shape becomes awash in unwanted luminance energy. This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022). < n.1859
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