Portion of a television transmission that controls brightness of the red, green, and blue proportions in a television picture. The standard luminance setting in a picture is 30 percent red, 60 percent green, and 10 percent blue. These numbers can be adjusted to produce varying colors, grays, whites, and blacks.

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The amount of light reflected from an object or surface. Measured in candelas per square meter (cd/m2), or foot Lamberts (fL).

That part of a video signal relating to the degree of brightness at any given point in the video image. If luminance is high, the picture is bright and if low, the picture is dark. Changing the chrominance does not affect the brightness of the picture.

Photometric measure of the radiant intensity of a light source. SI units are 1m sr-1 m-2 or cd m-2. Radiometric equivalent is radiance.

The intensity of light in a color. Color QuickDraw uses a color's luminance to convert the color to an appropriate grayscale color.

Luma -The part of the S-Video signal that carries the picture information.

The light reflected by, or emanating from, a surface.

In a given direction, at a given point of a real or imaginary surface. Quotient of the luminous flux transmitted by an elementary beam passing through the given point and propagating in the solid angle containing the given direction, and the product of the solid angle, the area of a section of that beam containing the given point, and the angle between the normal to that section and the direction of the beam. Unit candela per square meter, cd/m2.

The measure of the intensity of the combined color (white) portion of a video signal.

Luminance is a measure of light as it emanates from a surface. A mirror is perceived as brighter than a white surface under the same illuminance. Luminance is expressed in candelas per square inch or centimeter and may vary greatly due to surface reflectance and glossiness.

Video: The black-and-white component of a color video signal. Luminance is the "Y" component in R-Y and B-Y. More properly called Luma.

The lower nybble of a color register's color. There are eight even- numbered values for luminance ($0 to $F, even values only) which in combination with hue values produce the 128 colors available on the ATARI 400/800 Computer.

The amount of light that appears to emanate from an image.

At a point and in a given direction, the luminous intensity in the given direction produced by an element of the surface surrounding the point divided by the area of the projection of the element on a plane perpendicular to the given direction. L = dE/(dw cos theta). Units: candelas per unit area.

A unit of light measurement, the amount of visible light that comes to the eye from a surface. In the special case of Dark Adaptation of the Eye, luminances of less than about 0.034 cd/m squared are the lowest measured light level detectable to the human eye. (cd/m squared means: Candela per square meter.)

A term used to describe images that contain only one pixel component per pixel. A one-component image is sometimes called a "grayscale" or "intensity" image.

the luminous intensity of a surface in a given direction per unit of projected area in a plane perpendicular to that direction

The amount of light reflecting or radiating from a photographic subject. This can be measured with a lightmeter. Back to the top

the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"

Amplitude (strength) of the gray scale or black-and-white portion of the video signal.

The amount of light emitted by any radiant light.

A measure of the amount of light emitted or reflected by a surface in a given direction

Abbreviated Y. That part of the video signal that carries the information on how bright the TV signal is to be; The black and white signal.

Density of luminous flux leaving a surface in a particular direction. It is the quotient of the intensity of the source in the direction of measurement by the projected area of the source in that direction.

refers to the amount of visually effective light emitted by an extended source. Typically expressed in nits, footlamberts (fL) or candelas per square meter (cd/m2). • One fL = 3.43 cd/m2 or 3.42626 nits • One cd/m2 = 0.292fL or 1 nit

the photometric quantity most closely associated with the perception of brightness, measured in units of luminous intensity (candelas) per unit area (feet squared or meters squared).

The brightness component of a color video signal. Determines the level of picture detail. See Luma

Luminous intensity (photometric brightness) of any surface in a given direction per unit of projected area of the surface as viewed from that direction, measured in footlamberts (fl).

the amount of light coming from the display surface; the light that ultimately reaches the user's eye

The measure of the apparent brightness of an object, measured in lumens.

Refers to the video signal information about the scene brightness. The measurable, luminous intensity of a video signal. Differentiated from brightness in that the latter is nonmeasurable and sensory. The color video picture information contains two components, luminance (brightness and contrast) and chrominance (hue and saturation). The photometric quantity of light radiation.

A measure of the brightness of a sign. It is usually applied to signs with a significant surface area (not point sources) and is expressed in terms of Candelas per Square Meter.

The intensity (power weighted by the overall spectral sensitivity of the eye) per unit area of a light source.

Refers to the brightness of the computer screen.

Loosely, the sum of RGB tristimulus values corresponding to brightness. May refer to a linear signal or (incorrectly) a nonlinear signal.

Light reflected in a particular direction; the photometric quantity most closely associated with brightness perception, measured in units of luminous intensity (candelas) per unit area (square feet or square meters).

The brightness component of the video signal (the black and white part of the signal). The black and white portion of a video signal which carries the information for brightness and darkness and contrast. Luminance ranges from pure black to pure white. When combined with the color portion (chrominance), a complete video image can be developed.

The brightness or black-and-white component of a color video signal. Determines the level of picture detail.

luminous intensity per unit area projected in a given direction. Measured in candela per square metre

The objective measurement of brightness in the displayed scene.

is the brightness intensity of a visual image. The luminance control on a television is often called the "picture."

Luminance refers to the color intensity of an image.

The brightness element of a video signal.

The monochrome portion of a video signal.

The signal that represents the brightness in a video picture and is abbreviated as "Y".

The portion of a composite signal that carries brightness information. For example, luminance information is contained in the Y component of a YCbCr signal. Video compression techniques take advantage of the fact that the human eye is more sensitive to variations in luminance than it is to variations in color ( chrominance). Therefore, chrominance values can be compressed (with lossy techniques) more than luminance values, resulting in greater overall compression.

The lightness or luminance of a color is similar to its value or brightness but the two are not the same thing. In the physical world, luminance is the physically quantifiable intensity of light measured in energy per unit area. On your computer the sun may appear brighter than a tree, but in reality each pixel on the screen is emitting the same amount of energy. Luminance is a way to recreate that light effect on the computer. Colors wash out as luminance increases and colors darken as luminance decreases.

The perceived brightness of a surface. Often refers to a weighted average of red, green, and blue color values that gives the perceived brightness of the combination.

Luminance is the measurable photometric brightness of an illuminated or illuminating surface. Luminance describes the quality of illumination better than illuminance does. The units of luminance are candela per square unit area (cd/m2) or footlamberts (fL). Measuring sensor heads with defined angle of view are used to measure luminance so that a small area within a larger uniform field is sampled. Formula: cd/m2 = nit = (m2 * sr) fL = lm / (ft2 * sr) Luminous Flux ( Luminous flux is the light power of an illumination source like a lamp (bulb) or a light emitting diode (LED) and is quantified in lumens (lm). Since illumination generated by these sources is not emitted in parallel beams of light it must be measured with a geometry independent of its spatial distribution.

The measured value of brightness; reflected light measure on motion picture screens as footlamberts or candelas per square meter.

A photometric measure of "brightness" of a surface as seen by the observer, measured in candelas per square meter.

Luminous flux per unit solid angle per unit area of emitting surface at an angle with respect to surface normal, in candela per square meter or nits.

The light/dark value of a video signal.

The quantitative attribute of light that correlates with the sensation of brightness and is the evaluation of radiance by means of the standard luminosity function.

The relative brightness values of a particular object in a scene.

The part of a video signal that consists of the monochrome data.

The portion of a composite video signal that represents the monochrome or brightness part of the image.

The measurement (quantification) of an object's brightness/lightness. Same as tone.

The brightness information of a television picture. It is also used to refer to the brightness component (Y signal) of a PAL, SECAM or NTSC television signal.

The amount of light intensity; one of the three image characteristics coded in composite television (represented by the letter Y). May be measured in lux or foot-candles. Also referred to as Intensity.

Component of the video signal that represents the brightness of the image.

The measure of the intensity of the noncolor portion of the video signal; the brightness.

A measure of the brightness or luminous intensity of light, usually expressed in units of Candelas per square meter (cd/m2) or foot Lamberts. 1 fL = 3.426 cd/m2.

The brightness information in the television picture. The luminance signal amplitude varies in proportion to the brightness of the televised scene and is therefore capable of producing a complete monochrome picture.

The brightness component of a television signal. See also Chrominance.

The measure of brightness with which the eye perceives an illuminated surface from a certain direction. The luminous intensity per unit of visible surface of a light source (direct light) or an illuminated surface (reflection or indirect light) Luminance is indicated in candelas per square metre (cd/m2)

A quantitative measure of the intensity of light from a source, measured with a device called a photometer.

The measure of the energy that produces the sensation of brightness.

The black-and-white component of a video signal, abbreviated Y. Luminance is combined with the color signal (chrominance) in composite video connections, but kept apart in S-Video and component connections.

"The brightness

refers to the brightness information of the overall video signal. Also see chrominance, component video, and S-video. back to the previous page

Brightness.[ goto Top of Page

The intensity of a source of light. Synonymous with brightness.

The black and white, or brightness, part of a component video signal.

Brightness of an image or object.

Measurable quantity (candelas per square inch or per square meter) which is related to perceived brightness.

A measure of the intrinsic luminous intensity emitted by a source in a given direction. Luminance is a measure only of light. The comparable term for electromagnetic radiation in general is radiance.

A photometric term that quantifies brightness of a light source or of a surface that is illuminated and reflects light. It is expressed as foot lamberts (English units) or candelas per square meter (metric units).

The video signal that describes the amount of light in each pixel. Luminance is a weighted sum of the R, G, and B signals. See also chrominance and Y signal.

the luminous intensity of any surface in given direction per unit of projected area of the surface, as viewed from that direction. The SI unit of luminance is the candela per square meter. It was formerly called brightness.

This is the portion of the video signal which contains the black and white information. Luminance indicates the amount of light intensity in a picture which is perceived by the eye as brightness.

The measured amount of light reflected by a surface.

The brightness of a surface per unit area without reflection of any ambient light Page Top

Component of video data that includes technical "information" about its brightness.

The monochrome component of a color video signal. Called the "Y" components as in R-Y and B-Y.

The brightness information of a video signal (denoted Y).

This refers to the part of a video signal that carries the monochrome information. i.e. brightness information.

The black and white portion of a video signal which carries the information for brightness and darkness and contrast. TOP OF GLOSSARY

The signal which represents brightness, or the amount of light in the picture. This is the only signal required for black and white pictures, and for color systems it is obtained as a weighted sum (Y= 0.3R = 0.59G = 0.11B) of the R, G and B signals.

The measured brightness of a screen, expressed in foot-lamberts.

Black-and-white portion of video signal. Carries brightness information representing a scene's contrast and light and dark qualities. Represented by the symbol "Y." [See chrominance.

Refers to the black-and-white information, including brightness, sharpness, and contrast, encoded in a video signal or graphic image.

Photometric brightness, or the brightness of light calibrated for a sensor whose spectral response is similar to the light-adapted human eye; measured in nits or footlamberts. See also photometric units.

A measurement of light at a point on a surface. Most commonly associated with the perception of brightness of a surface.

The Monochrome element of a video signal. Known as Y

Perceived brightness, or grayscale level, of a color. Luminance and chromaticity together fully define a perceived color.

Lightness. The highest of the individual RGB values plus the lowest of the individual RGB values, divided by two; a component of Hue-Saturation- Lightness image.

The lightness or brightness of an image.

The color's brightness

Refers to the brightness of an image.

Luminance is the brightness or could be described as the black & white scale of color video.

a measure of brightness, the monochrome component of a composite or S-Video signal.

From Portable Network Graphics (PNG) Specification (Second Edition) ( 2003-11-10) formal definition of luminance is in [CIE-15.2] . Informally it is the perceived brightness, or greyscale level, of a colour. Luminance and chromaticity together fully define a perceived colour.

The degree of brightness (black and white portion of the video signal) at any given point in the video image. A video signal is comprised of luminance, chrominance* (color information) and sync*. If luminance is high, the picture is bright and if low the picture is dark. Changing the chrominance does not affect the brightness of the picture.

The brightness or intensity of an image.  Determined by the amount of gray in a hue, luminance reflects the lightness or darkness of a color.

Black and white portion of a video signal representing picture contrast and brightness.

This term is used to describe the specific light which comes off the surface whether off a filament, light bulb, lens, louver, tabletop, etc. Luminance varies with both the direction at which you view the surface and its gloss characteristics. Luminance is measured in candela per square foot. The black and white (Y) portion of a composite, Y/C, or Y/Pb/Pr video signal. The luminance channel carries the detail of a video signal. The color channel is laid on top of the luminance signal when creating a picture. Having a separate luminance channel ensures compatibility with black-and-white televisions.

Describes the brightness of an image.

The luminous intensity of a surface in a given direction per unit area of that surface as viewed from that direction; often incorrectly referred to as "brightness."

Video imaging relative brightness Lux Unit of light measurement typically for cameras

The physical measure of the stimulus which produces the sensation of brightness measured by the luminous intensity of the light emitted or reflected in a given direction from a surface element, divided by the area of the element in the same direction. The SI unit of luminance is the candela per square metre.

The luminous intensity or brightness of any surface in a given direction, per unit of projected area of the surface as viewed from that direction, independent of viewing distance. The SI unit is the candela per square meter.

The portion of a color display which is related to display intensity; how bright a color is perceived by the eye. micron (micrometer)) A measurement of length in the metric system appropriate for measuring infrared radiation wavelengths. 1,000,000 microns equals one meter.

The signal representing the measurable intensity (comparable to brightness) of an electronic image when the image is represented as separate chrominance and luminance. Luminance also expresses the light intensity of a diffuse source as a function of its area; measured in lumens or candles per square foot (1 lumen per square foot = 1 footlambert). SMPTE RP 98 calls for a luminance of 12 to 22 footlamberts for theatre screens. See: Footlambert.

Black and white portions of video signals, carries brightness information representing picture contrast, light and dark qualities; frequently abbreviated as "Y". (See Chrominance.)

Reflected light sent in a given direction. The observation of brightness expressed in the measuring unit of light intensity, candelas. (See Candela, Candlepower).

The photometric equivalent of radiance. Luminance is obtained by integrating spectral radiance weighted by luminous efficiency over the visible spectrum. Compare illuminance.

Means brightness, but in TV refers to the video signal information about the scene brightness

The amount of light reflected or transmitted by an object.

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The term used to denote the brightness or black-and-white picture of a video image.

a color's brightness.- M, N

The physical measure of the subjective sensation of brightness; measured in lumens.

Amplitude (brightness) of the gray scale portion of the television signal. The Y signal. The range of brightness from black through gray to white in a video picture.

Luminance is a photometric measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle.

Relative luminance follows the photometric definition of luminance, but with the values normalized to 1 or 100 for a reference whitePoynton, Charles. Digital Video and HDTV: Algorithms and Interfaces. ISBN 1-55860-792-7.