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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 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 Q {\displaystyle Q} .
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.
WordNet is a lexical database of semantic relations between words that links words into semantic relations including synonyms, hyponyms, and meronyms. The synonyms are grouped into synsets with short definitions and usage examples. It can thus be seen as a combination and extension of a dictionary and thesaurus.
Another example is incandescent light bulbs, which emit only around 10% of their energy as visible light and the remainder as infrared. A common thermal light source in history is the glowing solid particles in flames , but these also emit most of their radiation in the infrared and only a fraction in the visible spectrum.
Fig. 1. HSL (a–d) and HSV (e–h). Above (a, e): cut-away 3D models of each. Below: two-dimensional plots showing two of a model's three parameters at once, holding the other constant: cylindrical shells (b, f) of constant saturation, in this case the outside surface of each cylinder; horizontal cross-sections (c, g) of constant HSL lightness or HSV value, in this case the slices halfway ...
While the chroma and lightness of an object are its colorfulness and brightness judged in proportion to the same thing ("the brightness of a similarly illuminated area that appears white or highly transmitting"), the saturation of the light coming from that object is in effect the chroma of the object judged in proportion to its lightness.