brightness


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Related to brightness: brightness control, Brightness temperature

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 classic literature ?
During their games, their bounds, while rivalling each other in beauty, brightness, and velocity, I distinguished the green labre; the banded mullet, marked by a double line of black; the round-tailed goby, of a white colour, with violet spots on the back; the Japanese scombrus, a beautiful mackerel of these seas, with a blue body and silvery head; the brilliant azurors, whose name alone defies description; some banded spares, with variegated fins of blue and yellow; the woodcocks of the seas, some specimens of which attain a yard in length; Japanese salamanders, spider lampreys, serpents six feet long, with eyes small and lively, and a huge mouth bristling with teeth; with many other species.
The sun was now gone out of the sky, leaving, however, a rich inheritance of his brightness among those purple and golden clouds which make the sunsets of winter so magnificent.
It was a frosty kind of brightness, too, like that of an icicle in the moonlight.
The reason for this was that, though there was no cloud in the sky to dim the brightness of day, there was no sun to give brightness.
Hand-in-hand, shining in their unearthly brightness through the bright moonlight itself, the two stood before me.
Suddenly, as he spoke, a great brightness fell about him, causing him to look upward, thinking the sun had burst through a rift in the clouds; but there were no clouds.
She gives kindly gifts to men: smiles are ever on her lovely face, and lovely is the brightness that plays over it.
adorned with all the charms in which nature can array her; bedecked with beauty, youth, sprightliness, innocence, modesty, and tenderness, breathing sweetness from her rosy lips, and darting brightness from her sparkling eyes, the lovely Sophia comes!
Yes," I said, "perfectly,--'The presbytery has lost nothing of its charm, nor the garden its brightness.
she asked him, looking straight into his eyes, which shone with rather a suspicious brightness.
I remember the time by the sudden brightness and clearness, the feverish strain and excitement of all my faculties which came with it.
Something strangely powerful there was in the light of Stephen's long gaze, for it made Maggie's face turn toward it and look upward at it, slowly, like a flower at the ascending brightness.