- the quality or state of being luminous
- a measure of the brightness of a luminous surface, measured in candelas per unit area
- that component of a video signal that carries information about brightness
Origin of luminancefrom Classical Latin lumen (gen. luminis), light + -ance
- The condition or quality of being luminous.
- Physics The intensity of light per unit area of its source. Also called photometric brightness .
luminance - Computer Definition
The measure of intensity, or brightness, as measured in candelas per square meter. Luminance can vary within an image. An analog video transmission varies the luminance by varying the power level, or amplitude, of the signal, with high power representing black and low power representing white. See also candela and luminous flux.
The amount of brightness, measured in lumens, that is given off by a pixel or area on a screen. For example, dark red and bright red would have the same chrominance, but a different luminance. Bright red and bright green could have the same luminance, but would always have a different chrominance. See luma.