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Brightness is an antonym of "dimness" or "dullness". With regard to stars , brightness is quantified as apparent magnitude and absolute magnitude . Two pictograms resembling the Sun with rays are used to represent the settings of luminance in display devices .
Brightness is the polar opposite of darkness. Brightness may also refer to: Scientific. Luminosity; Brightness (sound) Brightness temperature; Surface Brightness;
The nonstandard usage of "brightness" for "radiance" persists in some fields, notably laser physics. The radiance divided by the index of refraction squared is invariant in geometric optics . This means that for an ideal optical system in air, the radiance at the output is the same as the input radiance.
The apparent magnitude is the observed visible brightness from Earth which depends on the distance of the object. The absolute magnitude is the apparent magnitude at a distance of 10 pc (3.1 × 10 17 m ), therefore the bolometric absolute magnitude is a logarithmic measure of the bolometric luminosity.
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/m 2). A non-SI term for the same unit is the nit.
Apparent magnitude, the brightness of an object as it appears in the night sky. Absolute magnitude, which measures the luminosity of an object (or reflected light for non-luminous objects like asteroids ); it is the object's apparent magnitude as seen from a specific distance, conventionally 10 parsecs (32.6 light years ).
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The term "brightness" is also used in discussions of sound timbres, in a rough analogy with visual brightness. Timbre researchers consider brightness to be one of the perceptually strongest distinctions between sounds [ 14 ] and formalize it acoustically as an indication of the amount of high-frequency content in a sound, using a measure such ...