luminance


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lu·mi·nance

(lū'mi-nănts),
The brightness of an object, expressed as the luminous flux per unit solid angle per unit projected area, measured in lamberts or in candelas per square meter.
[L. lumino, to light up, fr. lumen, light]

lu·mi·nance

(lū'mi-năns)
The brightness of an object, expressed as the luminous flux per unit solid angle per unit projected area, measured in lamberts or in candelas per square meter.
[L. lumino, to light up, fr. lumen, light]

luminance

Photometric term characterizing the way in which a surface emits or reflects light in a given direction. It is equal to the luminous intensity measured in a given direction divided by the area of this surface projected on a perpendicular to the direction considered. Symbol: L. Units: candela per square metre (SI unit); footlambert; lambert, etc. See brightness; candela per square metre; footlambert; lambert; lightness; millilambert; nit; photometry; SI unit.
References in periodicals archive ?
The motivation of the paper is to design an appropriate measure for some HVS characteristics, especially image structures and luminance, and develop a novel PIQA metric.
On each trial participants viewed 1 of the 3 disks of different luminance (3.2, 10, and 32 cd/[m.sup.2]) presented for 500 ms; after the disk had disappeared, the participant reported the perceived brightness of the disk aloud during inter-stimulus interval (ISI), given that the magnitude of the standard disk was 10 (Stevens, 1971).
(8,20,21), but also with studies on the changes in sensitivity to second-order stimuli (non-elementary stimuli, defined by changes in features, texture, and depth, and not only by sinusoidal modulation of luminance in space) and studies on changes in perception of contour deformation throughout aging.
Dramatic reduction of luminance and EL intensity was recorded once the Ti[O.sub.2] NPs content exceeded 25wt.%.
Luminance: 2520 cd/m2 (5000K), 2700 cd/m2 (4000K), 3000 cd/m2 (3000K)
The independent variables included the color and luminance of an image that was reflected on the vehicle's windshield.
Also, the dependences of the relative luminance of the object L* on the relative density of fog were obtained for different colour (dominant wavelength) of the LEDs.
Anchoring is concerned with the localization of luminance values in relation to the grey scale (Which luminance is perceived as white?).
In conventional photography, the luminance of the captured image differs from the one of the real scene due to the difference in their dynamic intervals (the ratio between the lowest and greatest possible brightness value).
At the Light and Building trade fair in March, GL Optic launched the GL Opticam 1.0--an optical digital image camera system, which supports luminance measurements for the quality control of lighting products, illuminated symbols and automotive and electrical displays.
There's luminance range masking and color range masking to limit the effects of image editing to a range of tones or brightness (luminance) or to a range of colors.