BRIGHTNESS

'Brightness' is an attribute of visual perception in which a source appears to emit a given amount of light. In other words, brightness is the perception elicited by the luminance of a visual target. This is a subjective attribute/property of an object being observed.
"Brightness" was formerly used as a synonym for the photometric term ''luminance'' and (incorrectly) for the radiometric term ''radiance''.
According to Federal Standard 1037C, "brightness" should now be used only for nonquantitative references to physiological sensations and perceptions of light.
A given target luminance can elicit different perceptions of brightness in different contexts; see, for example, White's illusion and Wertheimer-Benary illusion.
In the RGB color space, brightness can be thought of as the arithmetic mean ''μ'' of the 'R'ed, 'G'reen, and 'B'lue color coordinates (although some of the three components make the light seem brighter than others, which, again, may be compensated by some display systems automatically):
:$mu\; =\; \{R\; +\; G\; +\; B\; over\; 3\; \}.$
Brightness is also a color coordinate in the HSB or HSV color space (hue, saturation, and brightness or value).
With regard to stars, brightness is quantified as apparent magnitude and absolute magnitude.

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See also

External links

See also

★ Luma (video)

★ Luminance

★ Luminance (relative)

★ Saturation

★ Apparent magnitude

★ Absolute magnitude

External links

★ Poynton's Color FAQ