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The company was established as "Fabrique Genevoise de Crayons Ecridor" in Geneva in 1915. [2] When Arnold Schweitzer took over the company in 1924, he renamed it after Caran d'Ache, the pseudonym of the Russian-French satiric political cartoonist Emmanuel Poiré – who in turn took his pseudonym from карандаш (karandash), the Russian word for 'pencil', itself of Turkic origin.
Born in Moscow on 6 November 1858, d'Ache was the grandson of an Officer-Grenadier in Napoleon's Grande Armée who, wounded during the Battle of Borodino, had stayed behind in Russia. [5] After his grandfather's death, he was adopted by a Polish family whose daughter he later married. His younger sister, Maria Poiret, became a famous dancer and ...
"Luminance" can mean several things even within the context of video and imaging: luminance is the photometric brightness of an object (in units of cd/m 2), taking into account the wavelength-dependent sensitivity of the human eye (the photopic curve); relative luminance is the luminance relative to a white level, used in a color-space encoding;
Below the main set of seven bars is a strip of blue, magenta, cyan, and white or gray castellations. When a television receiver is set to filter out all colors except for blue, these castellations, combined with the main set of color bars, are used to adjust the color controls; they appear as four solid blue bars, with no visible distinction ...
The word was proposed to prevent confusion between luma as implemented in video engineering and relative luminance as used in color science (i.e. as defined by CIE). Relative luminance is formed as a weighted sum of linear RGB components, not gamma-compressed ones. Even so, luma is sometimes erroneously called luminance. [2]
High-dynamic-range television (HDR-TV) is a technology that uses high dynamic range (HDR) to improve the quality of display signals. It is contrasted with the retroactively-named standard dynamic range (SDR). HDR changes the way the luminance and colors of videos and images are represented in the signal and allows brighter and more detailed ...