Definition of luminance in English:

luminance

nounˈluːmɪn(ə)nsˈlumənəns

mass nounPhysics

1The intensity of light emitted from a surface per unit area in a given direction.
〔物理〕亮度
Example sentencesExamples
- This principal component direction is taken to be the luminance direction.
- 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.
1. 1.1 The component of a television signal which carries information on the brightness of the image.
  （电视信号中的）亮度信号
  Example sentencesExamples
  These signals are also what is referred to as Y / C signal or luminance and chrominance.
  The Y component is the luminance of the signal (not the color yellow), and delivers the gray scale image.
  It is thus possible to quickly restore the light quantity control function by inputting the current luminance signal to an iris controller before the display of the still picture is stopped.
  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.
  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).

Origin

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

Definition of luminance in US English:

luminance

nounˈlumənənsˈlo͞omənəns

Physics

1The intensity of light emitted from a surface per unit area in a given direction.
〔物理〕亮度
Example sentencesExamples
- 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. 1.1 The component of a television signal which carries information on the brightness of the image.
  （电视信号中的）亮度信号
  Example sentencesExamples
  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).
  It is thus possible to quickly restore the light quantity control function by inputting the current luminance signal to an iris controller before the display of the still picture is stopped.
  These signals are also what is referred to as Y / C signal or luminance and chrominance.
  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.

词汇	luminance
释义	Definition of luminance in English: luminance nounˈluːmɪn(ə)nsˈlumənəns mass nounPhysics 1The intensity of light emitted from a surface per unit area in a given direction. 〔物理〕亮度 Example sentencesExamples This principal component direction is taken to be the luminance direction. 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. 1.1 The component of a television signal which carries information on the brightness of the image. （电视信号中的）亮度信号 Example sentencesExamples These signals are also what is referred to as Y / C signal or luminance and chrominance. The Y component is the luminance of the signal (not the color yellow), and delivers the gray scale image. It is thus possible to quickly restore the light quantity control function by inputting the current luminance signal to an iris controller before the display of the still picture is stopped. 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. 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). Origin Late 19th century (as a general term meaning 'light, brightness'): from Latin luminant- 'illuminating' (from the verb luminare) + -ance. Definition of luminance in US English: luminance nounˈlumənənsˈlo͞omənəns Physics 1The intensity of light emitted from a surface per unit area in a given direction. 〔物理〕亮度 Example sentencesExamples 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. 1.1 The component of a television signal which carries information on the brightness of the image. （电视信号中的）亮度信号 Example sentencesExamples 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). It is thus possible to quickly restore the light quantity control function by inputting the current luminance signal to an iris controller before the display of the still picture is stopped. These signals are also what is referred to as Y / C signal or luminance and chrominance. 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.
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