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luminance

Syllabification: lu·mi·nance
Pronunciation: /ˈlo͞omənəns
 
/

Definition of luminance in English:

noun

Physics
1The intensity of light emitted from a surface per unit area in a given direction.
Example sentences
  • The specifications are commonly based on the 2 - D illuminance, luminance, intensity, chromaticity, and polarization distributions.
  • Nits are also a measure of luminance, in so many candela per square metre.
  • This principal component direction is taken to be the luminance direction.
1.1The component of a television signal that carries information on the brightness of the image.
Example sentences
  • The Y component is the luminance of the signal (not the color yellow), and delivers the gray scale image.
  • Note that the green channel has twice the number of photodetectors as red or blue (this is because the majority of luminance information is carried in the green channel).
  • A sequence of passes separates the luminance and chrominance information from the composite video signal and demodulates the color carrier to separate out color information.

Origin

late 19th century (as a general term meaning 'light, brightness'): from Latin luminant- 'illuminating' (from the verb luminare) + -ance.

Definition of luminance in:

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