luminance
Definition
Noun: 1. The quality or state of emitting or reflecting light; luminous intensity per unit area. In physics and photometry, luminance is a precise measure of the luminous intensity of a surface in a given direction per unit of projected area. It describes how much light is emitted, reflected, or transmitted from a surface, and is what the human eye perceives as brightness. 2. Luminosity; the quality of being bright or shining.
Usage
- Luminance is a technical term used in physics, engineering, photography, and display technology to quantify and describe the brightness of light sources, surfaces, and screens.
- It is a measurable quantity, distinct from the subjective perception of "brightness."
Examples
- The luminance of the computer screen was adjusted to reduce eye strain.
- Engineers measured the luminance of the new LED streetlight to ensure it met safety standards.
- The painting's vivid colors were due to the high luminance of the pigments used.
Advanced Usage
- Luminance vs. Illuminance: While refers to the light coming a surface, refers to the amount of light falling a surface.
- Luminance Channel: In image processing and color models like Y'UV, the luminance channel (often denoted as Y') carries the brightness information of an image, separate from its color (chrominance) information.
Variants and Related Words
- Luminous (adjective): Emitting or reflecting light; shining.
- The watch had luminous hands that glowed in the dark.
- Luminosity (noun): The intrinsic brightness of a celestial object; or synonymously, the quality of being luminous.
- The star's luminosity is thousands of times greater than our Sun's.
- Illuminance (noun): The total luminous flux incident on a surface per unit area (measured in lux).
- Luminance Meter: A device used to measure luminance.
Synonyms
- Luminosity
- Luminousness
- Brightness (in its technical, photometric sense)
Antonyms
- Darkness
- Dimness
- Dullness
Noun
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the quality of being luminous; emitting or reflecting light
-
its luminosity is measured relative to that of our sun
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