Luminance definitions

lo͝o'mə-nəns
The condition or quality of being luminous.
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The intensity of light per unit area of its source.
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The quality or state of being luminous.
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A measure of the brightness of a luminous surface, measured in candelas per unit area.
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That component of a video signal that carries information about brightness.
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The luminous intensity of a light source per unit area. Occasionally the lambert unit is used to measure luminance.
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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.
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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.
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The quality of being luminous.
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The luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction, i.e. luminous intensity divided by unit area; measured in stilbs or apostilbs.
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