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luminance Definition

lu·mi·nance (lo̵̅o̅′mə nəns)

noun

  1. the quality or state of being luminous
  2. a measure of the brightness of a luminous surface, measured in candelas per unit area

Etymology: < L lumen (gen. luminis), light + -ance

luminance Telecom 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.
luminance Usage Examples

Preposition: of

  • source: Applies the luminance of the source to the destination.
  • area: FL: Unit used in lighting to describe the luminance of an area.

Converse of object

  • have: Monochrome display is not really adequate for debugging most graphics modes, because some colors have the same luminance.
  • contain: Luminance Signal - That portion of the NTSC color television signal which contains the luminance or brightness information.
  • use: The bad news is that existing software won't give you correct colors by using the luminance signals as described above.
  • represent: Gray scale conversion is based on the C.I.E. x,y,z system where y represents luminance.
  • measure: It has been characterizing displays since 1985, calibrating instruments and measuring luminance and chromaticity of displays.
  • produce: A third signal uses all 3 cones to produce luminance.

Adjective modifier

  • high: Warm humid climates have predominantly overcast skies of very high luminance.
  • minimum: Figure 5. The variation in maximum and minimum luminance for one laptop as a function of vertical viewing angle.
  • maximum: Figure 2. The variation in maximum screen luminance, minimum luminance and contrast with air temperature, taken at 10°C intervals.
  • uniform: Uniform sky The standard uniform sky is characterized by a uniform luminance that does not change with altitude or azimuth.

Modifies a noun

  • contrast: As such, maximizing luminance contrast may well cause discomfort and disorientation which could hamper escape.
  • signal: The difference in luminance signal voltage between adjacent rectangles should be approximately constant.
  • distribution: Unless stated otherwise the sky luminance distribution is assumed to be that of the CIE standard overcast sky.
  • noise: Luminance noise is too low on most quality laserdisc players to be an evaluation factor.
  • component: In some instances it means the luminance component of the NTSC or PAL signals.
  • value: That is why the luminance value is used to represent the CT data.

Noun used with modifier

  • screen: The TFT screens evaluated showed little or no variation in screen luminance.
  • sky: Unless stated otherwise the sky luminance distribution is assumed to be that of the CIE standard overcast sky.