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Photometric measure
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
Luminance
Yacht, manufactured by Lürssen
The superyacht Luminance was built by Lürssen of Germany and delivered to its owner, Rinat Akhmetov, a Ukrainian billionaire, in 2024. The yacht's exterior
Luminance_(yacht)
Ratiometric definition of luminance
Relative luminance Y {\displaystyle Y} follows the photometric definition of luminance L {\displaystyle L} including spectral weighting for human vision
Relative_luminance
Topics referred to by the same term
Look up luminance in Wiktionary, the free dictionary. Luminance is a photometric measure of the density of luminous intensity in a given direction, measured
Luminance_(disambiguation)
Brightness in an image or video
in video engineering and relative luminance as used in color science (i.e. as defined by CIE). Relative luminance is formed as a weighted sum of linear
Luma_(video)
Mathematical color model
calculated from gamma-corrected RGB input and that it is different from true luminance. Today, the term YUV is commonly used loosely in the computer industry
Y′UV
Digital image having no color information
same luminance (technically relative luminance) as the original color image (according to its colorspace). In addition to the same (relative) luminance, this
Grayscale
Visible difference in brightness or color
Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) distinguishable from a background
Contrast_(vision)
Perception of light level
brightness is the perception dictated by the luminance of a visual target. The perception is not linear to luminance, and relies on the context of the viewing
Brightness
Practice of encoding color images
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
Chroma_subsampling
Measure of illuminance for a combination of a camera's shutter speed and f-number
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
Exposure_value
Property of a color
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
Lightness
Perceptual phenomenon
of the color's luminance. This brightness increase by saturation, which grows stronger as saturation increases, is chromatic luminance, since achromatic
Helmholtz–Kohlrausch_effect
The Hunt effect or luminance-on-colorfulness effect comprises an increase in colorfulness of a color with increasing luminance. The effect was first described
Hunt_effect_(color)
Amount of light captured by a camera
scene luminance. Exposure is measured in units of lux-seconds (symbol lx⋅s), and can be computed from exposure value (EV) and scene luminance in a specified
Exposure_(photography)
Comparison of a wide range of brightnesses
logarithmically, it is helpful to have an appreciation of both illuminance and luminance by orders of magnitude. To help compare different orders of magnitude
Orders of magnitude (illuminance)
Orders_of_magnitude_(illuminance)
Image processing technique
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
Tone_mapping
High-dynamic-range imaging software
Luminance HDR, formerly Qtpfsgui, is graphics software used for the creation and manipulation of high-dynamic-range images. Released under the terms of
Luminance_HDR
Video signal that has been split into component channels
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
Component_video
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
APEX_system
Alternative representations of the RGB color model
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′)
HSL_and_HSV
Family of digital color spaces
red-difference chroma components. Luma Y′ (with prime) is distinguished from luminance Y, meaning that light intensity is nonlinearly encoded based on gamma
YCbCr
Color space developed by Adobe
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
Adobe_RGB_color_space
American photographer and environmentalist (1902–1984)
and he could not find his exposure meter; however, he remembered the luminance of the Moon and used it to calculate the proper exposure. In the resulting
Ansel_Adams
Concept of computer visual displays
complex procedure which evaluates the viewing cone from measurements of luminance and chromaticity versus direction of observation. ISO 13406-2 introduces
Viewing_cone
Image luminance mapping function
correction or gamma is a nonlinear operation used to encode and decode luminance in video or images. Gamma correction is, in the simplest cases, defined
Gamma_correction
Luminous flux incident on a surface per area
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
Illuminance
Specification of color hue and saturation
an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified
Chromaticity
Range of brightness of a display
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
Display_contrast
Shade of the color gray
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%
Middle_gray
Bright light which impairs vision
used to protect occupants. Glare is caused by a significant ratio of luminance between the task (that which is being looked at) and the glare source
Glare_(vision)
Instrument used to measure the luminance of the night sky
A sky quality meter (SQM) is an instrument used to measure the luminance of the night sky, more specifically the Night Sky Brightness (NSB) at the zenith
Sky_quality_meter
Widely used NTSC television test pattern
setting a television monitor or receiver to reproduce NTSC chrominance and luminance information correctly. A precursor to the SMPTE test pattern was conceived
SMPTE_color_bars
Visual artifact present in composite video signals
take two forms: chrominance interference in luminance (chrominance being interpreted as luminance), luminance interference in chrominance. Dot crawl is
Dot_crawl
the red, green and blue images, a fourth tube was included to provide luminance (black and white) detail of a scene. With such a camera, a sharp black
Four-tube_television_camera
Visual perception under well-lit conditions
Photopic vision is the vision of the eye under well-lit conditions (luminance levels from 10 to 108 cd/m2). In humans and many other animals, photopic
Photopic_vision
Unit of conventional retinal illuminance
illuminance. It is meant as a method for correcting photometric measurements of luminance values impinging on the human eye by scaling them by the effective pupil
Troland
Film by Denis Villeneuve
"Sandscreens" were used to simulate the natural luminance of the desert intended for backgrounds.
Dune_(2021_film)
2021 science-fiction novel by Andy Weir
food. Rocky tells Grace that Earth's Sun has returned to its original luminance, marking the success of Grace's mission. Knowing that humanity has survived
Project_Hail_Mary
Standard from the International Telecommunication Union
60 Hz and 625-line 50 Hz signals, both with an active region covering 720 luminance samples and 360 chrominance samples per line. The color encoding system
Rec._601
1872 painting by Claude Monet
is in fact, when measured with a photometer, the same brightness (or luminance) as the sky. Margaret Livingstone, a professor of neurobiology at Harvard
Impression,_Sunrise
Non-SI metric unit of luminance
unit of luminance named for Johann Heinrich Lambert (1728–1777), a Swiss mathematician, physicist and astronomer. A related unit of luminance, the foot-lambert
Lambert_(unit)
Improved version of VHS
format. S-VHS improved image quality by increasing the bandwidth of the luminance (brightness) signal; this allowed for an image resolution of approximately
S-VHS
Unit of measurement for luminance
A foot-lambert or footlambert (fL, sometimes fl or ft-L) is a unit of luminance in United States customary units and some other unit systems. A foot-lambert
Foot-lambert
SI derived unit of luminance
cd/m2; alternatively titled candela per square meter) is the unit of luminance in the International System of Units (SI). The unit is based on the candela
Candela_per_square_metre
Optical illusion
spatial high-boost filtering performed by the human visual system on the luminance channel of the image captured by the retina. Mach reported the effect
Mach_bands
Measurement of visible light
starlight. Photopic vision is characteristic of the eye's response at luminance levels over three candela per square metre. Scotopic vision occurs below
Photometry_(optics)
Video and image technology for HDR displays
the retroactively named standard dynamic range (SDR). HDR changes how luminance and colors in videos and images are represented in the signal, allowing
High-dynamic-range_television
Television test card
setting a television monitor or receiver to reproduce chrominance and luminance information correctly. The EBU bars are most commonly shown arranged side-by-side
EBU_colour_bars
Television that uses analog signals
television was in the 1950s. A practical television system needs to take luminance, chrominance (in a color system), synchronization (horizontal and vertical)
Analog_television
Television broadcasting system
so D2-MAC was designed for European cable TV systems. MAC transmits luminance and chrominance data separately in time rather than separately in frequency
D-MAC
8 mm video cassette tape
electronics and media formulation to increase the recorded bandwidth of the luminance signal. The FM carrier frequency range was increased from 4.2 to 5.4 MHz
Hi8
Color space model
HCL (hue–chroma–luminance) or LCh refers to any of the many cylindrical color space models that are designed to accord with human perception of color
HCL_color_space
Change in hue perception
The Bezold–Brücke shift or luminance-on-hue effect is a change in hue perception as the luminance (light intensity) of a color changes. As intensity increases
Bezold–Brücke_shift
Theory regarding color vision in humans
implicates three opponent channels: L versus M, S versus (L+M), and a luminance channel (+ versus -). These cone-opponent mechanisms were at one time
Opponent_process
Custom chips used in Atari 8-bit computers
Color/luminance of Player and Missile 1. SHADOW: PCOLOR2 $02C2 Color/luminance of Player and Missile 2. SHADOW: PCOLOR3 $02C3 Color/luminance of Player
CTIA_and_GTIA
Anti-aliasing algorithm
The input data is the rendered image and optionally the luminance data. Acquire the luminance data. This data could be passed into the FXAA algorithm
Fast approximate anti-aliasing
Fast_approximate_anti-aliasing
Signal format for standard-definition video
composite video, the chroma and luminance signals are combined and coexist on different frequencies. To achieve this, the luminance signal must be low-pass filtered
S-Video
illumination conditions. However, both models can be rewritten in terms of luminance, as shown by Gerbino et al. (1990). Although physically correct in a number
Perceptual_transparency
Image on photographic film
the color of the image is inverted but not its luminance. The negative of such an image has the luminance inverted but not the color. Whereas a physical
Negative_(photography)
Visual illusion evoking an edge
is a visual illusion that evokes the perception of an edge without a luminance or color change across that edge. Illusory brightness and depth ordering
Illusory_contour
Lossy color image compression algorithm
which predates Color Cell Compression, in that it uses the dominant luminance of a block of pixels to partition said pixels into two representative
Color_Cell_Compression
Laws of sight
angular area A {\displaystyle A} is viewed against a uniform background luminance B {\displaystyle B} (e.g. a disc of white light is projected on a white
Ricco's_law
Type of optical illusion
refers to a motion illusion generated by the presentation of a sawtooth luminance grating in the visual periphery. This illusion was first described by
Peripheral_drift_illusion
Small domesticated carnivorous mammal
Mouat, G. S. V. (1985). "The relationship between feline pupil size and luminance". Experimental Brain Research. 59 (3): 485–490. doi:10.1007/BF00261338
Cat
Color appearance model
the six technically defined dimensions of color appearance: brightness (luminance), lightness, colorfulness, chroma, saturation, and hue. Brightness is
CIECAM02
Optical illusion
luminance. The zero-luminance background of Figure 2 (A) becomes a zero-contrast field in the analogous portion of Figure 1, while the high-luminance
Chubb_illusion
satellite TV transmissions. It was an analog television standard where luminance and chrominance components are transmitted separately in time rather than
C-MAC
Color filter array
patent (U.S. Patent No. 3,971,065) in 1976 called the green photosensors luminance-sensitive elements and the red and blue ones chrominance-sensitive elements
Bayer_filter
saturation but 75% luminance - similar to the EBU colour bars) and an intensity bit that controls a variation of the base color (a 75% luminance decrease for
List of 8-bit computer hardware graphics
List_of_8-bit_computer_hardware_graphics
Visual perception under low-light conditions
stilb – Deprecated unit of luminancePages displaying short descriptions of redirect targets Skot (unit) – Deprecated unit of luminance Spatial frequency – Characteristic
Scotopic_vision
French analog color television system
with the PAL video format standard. SECAM video is composite video; the luminance (luma, monochrome image) and chrominance (chroma, colour applied to the
SECAM
Process of removing noise from a signal
into chroma and luminance components and apply more noise reduction to the former or allow the user to control chroma and luminance noise reduction separately
Noise_reduction
Synchronisation signal in colour video
signal. Because this was black and white, the video consisted only of luminance (brightness) information. Although all of the space in between was occupied
Color_burst
Deprecated unit of luminance
is an old and deprecated measurement unit of luminance, used for self-luminous objects (dark luminance). The term comes from Greek skotos, meaning "darkness"
Skot_(unit)
Color model based on red, green and blue
many detectors as red and blue (ratio 1:2:1) in order to achieve higher luminance resolution than chrominance resolution. The sensor has a grid of red,
RGB_color_model
Electronic moving image
human eye is less sensitive to details in color than brightness, the luminance data for all pixels is maintained, while the chrominance data is averaged
Video
Diffuse luminance of the night sky
Skyglow (or sky glow) is the diffuse luminance of the night sky, apart from discrete light sources such as the Moon and visible individual stars. It is
Skyglow
Measurement describing the power of an illumination
radiant intensity, radiance, irradiance, radiant exitance, radiosity, luminance, luminous flux, luminous intensity, illuminance, luminous emittance).
Spectral_power_distribution
Energy consumption labelling scheme
measured screen luminance at 60 lux is between 65 % and 95 % of the screen luminance measured at 100 lux the measured screen luminance at 35 lux is between
European_Union_energy_label
Baseband analog video signal format
analog video format that combines image information—such as brightness (luminance), color (chrominance), and synchronization, into a single signal transmitted
Composite_video
Lürssen superyacht Luminance on sea trials in Germany". SuperYacht Times. Retrieved 2023-05-10. "139m Lürssen superyacht Luminance delivered". superyachttimes
List of yachts built by Lürssen
List_of_yachts_built_by_Lürssen
Principle in vision science
against a uniform background luminance B {\displaystyle B} . For the target to be visible there must be sufficient luminance contrast; i.e. the target must
De_Vries–Rose_law
Photographic technique used in astronomy
LRGB, short for Luminance, Red, Green and Blue, is a photographic technique used in amateur astronomy for producing good quality color photographs by
LRGB
Color difference signal
indicates a color difference signal between red (R) and a luminance component, as part of a luminance (Y) and chrominance (C) color model. It has different
R-Y
Topics referred to by the same term
(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
Light_intensity
CGS unit of luminance
The stilb (sb) is the CGS unit of luminance for objects that are not self-luminous. It is equal to one candela per square centimeter or 104 nits (candelas
Stilb_(unit)
Color difference signal
indicates a color difference signal between blue (B) and a luminance component, as part of a luminance (Y) and chrominance (C) color model. It has different
B-Y
Analog television system
line-rate modulation components of the luminance signal; the chrominance signal could be easily filtered out of the luminance signal on new sets, and would be
NTSC
Colour space defined by the CIE in 1931
metamers (i.e. if a = b then a + z = b + z). Proportionality: if the luminances of two metamers are equally increased or reduced by some constant (m)
CIE_1931_color_space
skin color Color dimensions Hue Dichromatism Colorfulness Pastel colors Luminance Lightness Darkness Brightness Iridescence Fluorescence Grayscale Tint
Lists_of_colors
Ability to see in low light conditions
conditions. Mesopic levels range approximately from 0.01 to 3.0 cd/m2 in luminance. Most nighttime outdoor and street lighting conditions are in the mesopic
Mesopic_vision
Optical effect
increased area lit, but is also partly due to the intrinsic brightness (the luminance) of the part that is sunlit. This is affected by the illuminance of the
Opposition_surge
Standard that defines a specific range of colors
value roughly analogous to (and sometimes incorrectly identified as) luminance, along with two chroma values as approximate representations of the relative
Color_space
Measure of lens speed
the illuminance it delivers to the film or sensor for a given subject luminance. Although this usage is common, it is an approximation that ignores the
F-number
Disfigurement of an electronic display
because the phosphor compounds that emit light to produce images lose their luminance with use. This wear results in uneven light output over time, and in severe
Screen_burn-in
Any mathematical model describing human perception of colors
of stimulation, the luminance level of the light that meets the eye, the background behind the observed object, and the luminance level of the surrounding
Color_appearance_model
Black-and-white photographic film sensitive to the whole visible light spectrum
The black-and-white simulations retain luminance information only. For the orthochromatic simulation, the red channel was clamped to 12.5% of the original
Panchromatic_film
Color evoked by a single wavelength of light in the visible spectrum
three-dimensional color space (which includes luminance), the spectral colors form a surface. When excluding luminance and considering a two-dimensional color
Spectral_color
Topics referred to by the same term
sk (unit) (Skot), an old and deprecated unit of measurement for dark luminance SK (people mover), a vehicle SK calculus, an alternate form of SKI combinator
SK
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