Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light. In other words, brightness is the perception elicited by the luminance of a visual target. The perception is not linear to luminance, and relies on the context of the viewing environment (for example, see White's illusion).
Brightness is a subjective sensation of an object being observed and one of the color appearance parameters of many color appearance models, typically denoted as


{\displaystyle Q}
. Brightness refers to how much light appears to shine from something. This is a different perception than lightness, which is how light something appears compared to a similarly lit white object.The adjective bright derives from an Old English beorht with the same meaning via metathesis giving Middle English briht. The word is from a Common Germanic *berhtaz, ultimately from a PIE root with a closely related meaning, *bhereg- "white, bright".
"Brightness" was formerly used as a synonym for the photometric term luminance and (incorrectly) for the radiometric term radiance. As defined by the US Federal Glossary of Telecommunication Terms (FS-1037C), "brightness" should now be used only for non-quantitative references to physiological sensations and perceptions of light.With regard to stars, brightness is quantified as apparent magnitude and absolute magnitude.
Brightness is an antonym of dimness or dullness.

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    Closed Cannot adjust brightness Windows 8.1

    Ok naman po yung laptop ko dati sa pag adjust ng brightness using fn key tapos left or right sa arrow keys. Pero minsan, stuck lang siya sa isang brightness, naka-charge man o hindi. Ayaw rin po niya ma-adjust using fn at arrow keys. Specs: Windows 8.1 64-bit Intel Celeron CPU 1007U 1.50 GHz...