brightness : Idioms & Phrases
brightness constancy
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noun the tendency for a visual object to be perceived as having the same brightness under widely different conditions of illumination
WordNet
brightness level
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noun the quality of being luminous; emitting or reflecting light
luminance; brightness; luminosity; luminousness; light.
- its luminosity is measured relative to that of our sun
WordNet
radio brightness
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noun the strength of a radio wave picked up by a radio telescope