With regard to stars, brightness is quantified as apparent magnitude and absolute magnitude. īrightness is an antonym of " dimness" or " dullness". 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. "Brightness" was formerly used as a synonym for the photometric term luminance and (incorrectly) for the radiometric term radiance. ![]() The word is from a Common Germanic * berhtaz, ultimately from a PIE root with a closely related meaning, * bhereg- "white, bright". The adjective bright derives from an Old English beorht with the same meaning via metathesis giving Middle English briht. This is a different perception than lightness, which is how light something appears compared to a similarly lit white object. Brightness refers to how much light appears to shine from something. The perception is not linear to luminance, and relies on the context of the viewing environment (for example, see White's illusion).īrightness is a subjective sensation of an object being observed and one of the color appearance parameters of many color appearance models, typically denoted as Q. In other words, brightness is the perception elicited by the luminance of a visual target. Decreasing brightness with depth (underwater photo as example)īrightness is an attribute of visual perception in which a source appears to be radiating or reflecting light. ![]() For other uses, see Brightness (disambiguation).
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