luminance
(noun)
The intensity of an object, independent from its color.
Examples of luminance in the following topics:
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Color Vision
- The intensity, or luminance Y, can be found from the following equation:
- The sensitivity to luminance drops off at low spatial frequencies, showing that we are not very good at estimating absolute luminance levels as long as they do not change with time - the luminance sensitivity to temporal fluctuations (flicker) does not fall off at low spatial frequencies.
- The maximum chrominance sensitivity is much lower than the maximum luminance sensitivity with blue-yellow (U) sensitivity being about half of red-green (V) sensitivity and about 16 of the maximum luminance sensitivity.
- The chrominance sensitivities fall off above 1 cycle / degree, requiring a much lower spatial bandwidth than luminance.
- This graph shows the sensitivity of the eye to luminance (Y) and chrominance (U, V) components of images.
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Other Forms of Energy
- Thermal, chemical, electric, radiant, nuclear, magnetic, elastic, sound, mechanical, luminous, and mass are forms that energy can exist in.
- Luminous Energy: This is energy that can be seen because it is visible light.
- An example of luminous energy is light from a flashlight.
- For example, luminous energy is radiant energy.
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Spherical and Plane Waves
- In 1678, he proposed that every point that a luminous disturbance touches becomes itself a source of a spherical wave; the sum of these secondary waves determines the form of the wave at any subsequent time.
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Dimensional Analysis
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Problems
- An optically thin cloud surrounding a luminous object is estimate to be 1 pc in radius and to consist of ionized plasma.Assume that electron scattering is the only important extinction mechanism and that the luminous object emits unpolarized radiation.
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Huygens' Principle
- In 1678, he proposed that every point that a luminous disturbance touches becomes itself a source of a spherical wave.