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Lightness is a visual perception of the luminance of an object. It is often judged relative to a similarly lit object. It is often judged relative to a similarly lit object. In colorimetry and color appearance models , lightness is a prediction of how an illuminated color will appear to a standard observer.
Lightness may refer to: Lightness, a property of a color; Lightness (philosophy), a philosophical concept most closely associated with continental philosophy and existentialism, which is used in ontology; A relatively low weight, mass or density of an object or material
The visual weight in an image is defined as the visual force that appears due to the contrast of light among the visual elements that compound it. [1]The visual weight is a visual force which prevails in the image balance.
HCT with tone as a synonym for luminance is then used within Material Design for its color system, using value ranges of 0–360°, 0–120+ and 0–100%, respectively. [6] Its hue and chroma come from CAM16 , whereas tone is actually L* from CIELab .
"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. [ 3 ]
A tea light-type candle, imaged with a luminance camera; false colors indicate luminance levels per the bar on the right (cd/m 2). Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. [1]
Relative luminance follows the photometric definition of luminance including spectral weighting for human vision, but while luminance is a measure of light in units such as /, relative luminance values are normalized as 0.0 to 1.0 (or 1 to 100), with 1.0 (or 100) being a theoretical perfect reflector of 100% reference white. [1]
It is how different from a grey of the same lightness such an object color appears to be. [5] Saturation is the "colorfulness of an area judged in proportion to its brightness", [6] [2] which in effect is the perceived freedom from whitishness of the light coming from the area. An object with a given spectral reflectance exhibits approximately ...