brightness

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brightness

(1) The luminous intensity of a light source, defined as candles/cm2.
(2) The intensity of reflection of light, measured in lamberts (one lambert equals 1 lumen/cm2).

brightness

(brīt′nĕs)
1. The perceived brilliance of an image, e.g., its clarity, how light it is (rather than how dark it looks), and the intensity of the light that it emits.
2. In imaging technology, e.g., radiology, the luminous intensity, measured in candelas, of a display monitor's visible emissions. Such brightness is solely a function of the monitor and is not related to the magnitude of exposure of the image receptor.

brightness 

Attribute of visual sensation according to which an area appears to emit more or less light. Syn. luminosity. Note 1: In British recommended practice, the term brightness is now reserved to describe brightness of colour (i.e. the opposite of dullness) as used in the dyeing industry. Note 2: This attribute is the psychosensorial correlate, or nearly so, of the photometric quantity luminance (CIE).
Brightness Acuity Tester (BAT) See glare tester.
brightness constancy See brightness constancy.
brightness enhancement See Brücke-Bartley effect.

brightness

said of a fleece of wool, a desirable characteristic found in superior fleeces. Consists of a white color and good light reflection.
References in periodicals archive ?
It's something whose intrinsic brightness you know and by looking at its apparent brightness - because the intensity of light fades with the square of the distance - you can easily calculate the distance.
the eye is now the problem, imperiums of sight, one after another, glance, gaze or glare; do you remember the orange itself, some other orange, or paint curling light into a skin of apparent brightness, incidents of touch, not merely recollected or assumed but edged into the space between canvas and pigment
His forest has an apparent brightness, as though some form of packaging were necessary to mute the anxiety and sense of vulnerability caused by our hopeless situation; but in psychosocial fact it is as dark as Dante's.
As the CFL experience has taught us, if certain minimum expectations in the quality, reliability, apparent brightness, and directivity of the light produced are not met, the products will be considered of poor quality which has the potential of slowing adoption by the market of this critical energy-saving technology.
By measuring the apparent brightness of the supernova and comparing it to what we know the true brightness of a Type 1A supernova to be, astronomers can calculate the distance with good accuracy.
Without the cosmic dust blocking their view at the infrared wavelengths seen by Spitzer, the research team was able to obtain more precise measurements of the stars' apparent brightness, and thus their distances.