Not to be confused with Luma (video), Luminescence, or Illuminance.
For other uses, see Luminance (disambiguation).
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Luminance" – news · newspapers · books · scholar · JSTOR(April 2023) (Learn how and when to remove this message)
A tea light-type candle, imaged with a luminance camera; false colors indicate luminance levels per the bar on the right (cd/m2)
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction.[1] It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.
The procedure for conversion from spectral radiance to luminance is standardized by the CIE and ISO.[2]
Brightness is the term for the subjective impression of the objective luminance measurement standard (see Objectivity (science) § Objectivity in measurement for the importance of this contrast).
The SI unit for luminance is candela per square metre (cd/m2). A non-SI term for the same unit is the nit. The unit in the Centimetre–gram–second system of units (CGS) (which predated the SI system) is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2.
^"luminance, 17-21-050". CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition. CIE - International Commission on Illumination. 2020. Retrieved 20 April 2023.
^ISO/CIE 23539:2023 CIE TC 2-93 Photometry — The CIE system of physical photometry. ISO/CIE. 2023. doi:10.25039/IS0.CIE.23539.2023.
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light...
Relative luminance Y {\displaystyle Y} follows the photometric definition of luminance L {\displaystyle L} including spectral weighting for human vision...
Lightness is a visual perception of the luminance ( L ) {\displaystyle (L)} of an object. It is often judged relative to a similarly lit object. In colorimetry...
same luminance (technically relative luminance) as the original color image (according to its colorspace). In addition to the same (relative) luminance, this...
brightness is the perception elicited by the luminance of a visual target. The perception is not linear to luminance, and relies on the context of the viewing...
brightness and color accuracy. The "luminance contrast" is the ratio between the higher luminance, LH, and the lower luminance, LL, that define the feature to...
the human visual system's lower acuity for color differences than for luminance. It is used in many video and still image encoding schemes – both analog...
Luminance HDR, formerly Qtpfsgui, is graphics software used for the creation and manipulation of high-dynamic-range images. Released under the terms of...
this leads to confusion with other uses of the word, such as to mean luminance. "Brightness" should never be used for quantitative description, but only...
same chromaticity as the white point, yet with a luminance equal to 0.34731% of the white point luminance. The ambient illumination level at the monitor...
Microsystems through a DB13W3 connector. Sync-on-luminance Similar to sync-on-green, but combines sync with the luminance signal (Y) of a color system such as YPbPr...
combinations that yield the same exposure have the same EV (for any fixed scene luminance). Exposure value is also used to indicate an interval on the photographic...
relationship of recommended photographic exposure to a scene's average luminance is given by the camera exposure equation A 2 T = B S x K {\displaystyle...
with a luminance ratio of 1:60 ( : ), the geometric mean had to be used to find the middle gray. That is equivalent to a relative luminance of 12.9%...
correction or gamma is a nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems. Gamma correction...
complex procedure which evaluates the viewing cone from measurements of luminance and chromaticity versus direction of observation. ISO 13406-2 introduces...
The candela per square metre (symbol: cd/m2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the...
an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified...
Inverse tone mapping is the inverse technique that allows to expand the luminance range, mapping a low dynamic range image into a higher dynamic range image...
(W·sr−1·m−2) Brightness, the subjective perception elicited by the luminance of a source Luminance, the photometric equivalent of radiance (lm·sr−1·m−2) Photometry...
square meter (cd/m2). Often the term luminance is used for the relative luminance, Y/Yn, where Yn is the luminance of the reference white point. Luma (Y′)...
Global Information
