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brightness

[brahyt-nis] /ˈbraɪt nɪs/
noun
1.
the quality of being bright.
2.
Optics. the luminance of a body, apart from its hue or saturation, that an observer uses to determine the comparative luminance of another body. Pure white has the maximum brightness, and pure black the minimum brightness.
Origin of brightness
950
before 950; Middle English brihtnes, Old English beorhtnes. See bright, -ness
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for brightness

brightness

/ˈbraɪtnɪs/
noun
1.
the condition of being bright
2.
(physics) a former name for luminosity (sense 4)
3.
(psychol) the experienced intensity of light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for brightness
n.

Old English beorhtnes "brightness, clearness, splendor, beauty;" see bright + -ness.

Online Etymology Dictionary, © 2010 Douglas Harper
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brightness in Technology

graphics
(Or "tone", "luminance", "value", "luminosity", "lightness") The coordinate in the HSB colour model that determines the total amount of light in the colour. Zero brightness is black and 100% is white, intermediate values are "light" or "dark" colours.
The other coordinates are hue and saturation.
(1999-07-05)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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