brightness


Also found in: Dictionary, Thesaurus, Legal, Acronyms, Encyclopedia, Wikipedia.

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 ?
Long life LED backlights provide 70,000 hours of operation to half brightness lifetime.
The researchers studied how the brightness stability of coated wood-free paper is affected by pigment coating and the substitution of high-yield pulp for hardwood kraft pulp.
Based on the result of the moderator brightness measurement, which was done after installing the first part of the full guide, we calculated by Monte Carlo the neutron flux out of the full length of the guide.
We examine the relative contribution of male versus female plumage brightness to plumage dichromatism and all three characteristics (female brightness, male brightness, sexual dichromatism) relative to variation in measured rates of nest predation and nest height.
Recent studies by Hammel's team show hints of a seasonal variation in Uranus' brightness (SN: 1/27/01, p.
The advent of alkaline papermaking allowed significantly increased use of fillers, especially calcium carbonate--which also improves brightness.
For applications that require reduced output, such as in shaded rooms, users can run a single lamp, or operate the unit in its "eco" low brightness mode (4300 ANSI Lumens), effectively extending the lamp life for a lower overall cost of ownership.
Although it would seem that the above methods would be sufficient to meet color, whiteness, and brightness measurements, in recent years addition of (non-bleach) chemical brightening agents, frequently called brighteners or fluorescent whitening agents (FWAs), has become common.
The rate at which a Cepheid's brightness varies is closely tied to its luminosity: Those with longer periods are intrinsically brighter.
Designed for professionals who rely on image excellence, both of the new NEC MultiSync LCD2490WUXi and LCD2690WUXi displays feature a 12-bit Look-Up Table (LUT) for unparalleled color breadth and depth, and ColorComp for improved color, brightness and grayscale uniformity.
Now the Framingham, Massachusetts-based firm will focus on another standard: TAPPI T 452, a standard for measuring the brightness of pulp, paper, and paperboard.
Scientists have now exploited this phenomenon to uncover evidence suggesting that, once visual information passes beyond the eyes, the brain immediately begins to interpret the brightness of surfaces based on light- dark contrasts, rather than solely calculating absolute levels of light.