30 relations: Absolute magnitude, Apparent magnitude, Arithmetic mean, Bert (name), Color appearance model, Colorfulness, Darkness, Electric light, Federal Standard 1037C, Federal Trade Commission, HSL and HSV, Hue, Light, Lightness, Luma (video), Luminance, Luminosity, Luminous flux, Photometry (optics), Proto-Germanic language, Proto-Indo-European language, Radiance, Radiometry, Relative luminance, RGB color space, Spectral centroid, Star, Timbre, Visual perception, White's illusion.
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
In mathematics and statistics, the arithmetic mean (stress on third syllable of "arithmetic"), or simply the mean or average when the context is clear, is the sum of a collection of numbers divided by the number of numbers in the collection.
Bert is a hypocoristic form of a number of Germanic male given names, such as Robert, Herbert, Gilbert, Norbert, Bertram, Berthold, and Albert.
A color appearance model (abbreviated CAM) is a mathematical model that seeks to describe the perceptual aspects of human color vision, i.e. viewing conditions under which the appearance of a color does not tally with the corresponding physical measurement of the stimulus source.
Colorfulness, chroma and saturation are attributes of perceived color relating to chromatic intensity.
Darkness, the polar opposite to brightness, is understood as a lack of illumination or an absence of visible light.
An electric light is a device that produces visible light from electric current.
Federal Standard 1037C, titled Telecommunications: Glossary of Telecommunication Terms, is a United States Federal Standard issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended.
The Federal Trade Commission (FTC) is an independent agency of the United States government, established in 1914 by the Federal Trade Commission Act.
HSL (hue, saturation, lightness) and HSV (hue, saturation, value) are two alternative representations of the RGB color model, designed in the 1970s by computer graphics researchers to more closely align with the way human vision perceives color-making attributes.
Hue is one of the main properties (called color appearance parameters) of a color, defined technically (in the CIECAM02 model), as "the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, green, blue, and yellow", (which in certain theories of color vision are called unique hues).
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
In colorimetry and color theory, lightness, also known as value or tone, is a representation of variation in the perception of a color or color space's brightness.
In video, luma represents the brightness in an image (the "black-and-white" or achromatic portion of the image).
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction.
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
In photometry, luminous flux or luminous power is the measure of the perceived power of light.
Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.
Proto-Germanic (abbreviated PGmc; German: Urgermanisch; also called Common Germanic, German: Gemeingermanisch) is the reconstructed proto-language of the Germanic branch of the Indo-European languages.
Proto-Indo-European (PIE) is the linguistic reconstruction of the hypothetical common ancestor of the Indo-European languages, the most widely spoken language family in the world.
In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area.
Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light.
Relative luminance follows the photometric definition of luminance, but with the values normalized to 1 or 100 for a reference white.
A RGB color space is any additive color space based on the RGB color model.
The spectral centroid is a measure used in digital signal processing to characterise a spectrum.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
In music, timbre (also known as tone color or tone quality from psychoacoustics) is the perceived sound quality of a musical note, sound or tone.
Visual perception is the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment.
White's illusion is a brightness illusion where certain stripes of a black and white grating is partially replaced by a gray rectangle (Fig. 1).