Luminance Definition
 lo͝omə-nəns 
    noun
  
 The quality or state of being luminous.
 Webster's New World 
A measure of the brightness of a luminous surface, measured in candelas per unit area.
 Webster's New World 
That component of a video signal that carries information about brightness.
 Webster's New World 
Synonyms: 
  - luminosity
 - light
 - brightness level
 - luminousness
 - brightness
 
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