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Louis Ducos Du Hauron
Louis Arthur Ducos du Hauron (8 December 1837 – 31 August 1920) was a French pioneer of color photography. Personal life He was born in Langon, Gironde and died in Agen. Photography After writing an unpublished paper setting forth his basic concepts in 1862, he worked on developing practical processes for color photography on the three-color principle, using both additive and subtractive methods. In 1868 he patented his ideas (French Patent No. 83061) and in 1869 he published them in ''Les couleurs en photographie, solution du problème''. The discovery of dye sensitization by Hermann Wilhelm Vogel in 1873 greatly facilitated the initial three-color analysis on which all of Ducos de Hauron's methods depended. The most widely reproduced of his surviving color photographs is the ''View of Agen'', an 1877 image of a landscape in southern France, printed by the subtractive assembly method he pioneered. Several different photographs of the view from his attic window, one dated ...
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Color Photography
Color photography (also spelled as colour photography in English in the Commonwealth of Nations, Commonwealth English) is photography that uses media capable of capturing and reproducing colors. By contrast, black-and-white or gray-monochrome photography records only a single channel of luminance (brightness) and uses media capable only of showing shades of gray. In color photography, electronic sensors or light-sensitive chemicals record color information at the time of exposure (photography), exposure. This is usually done by analyzing the spectrum of colors into three channels of information, one dominated by red, another by green and the third by blue, in imitation of the way the normal color vision#Physiology of color perception, human eye senses color. The recorded information is then used to reproduce the original colors by mixing various proportions of red, green and blue light (RGB color, used by video displays, digital projectors and some historical photographic proce ...
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Carbon Print
A carbon print is a photographic print with an image consisting of pigmented gelatin, rather than of silver or other metallic particles suspended in a uniform layer of gelatin, as in typical black-and-white prints, or of chromogenic dyes, as in typical photographic color prints. In the original version of the printing process, carbon tissue (a temporary support sheet coated with a layer of gelatin mixed with a pigment—originally carbon black, from which the name derives) is bathed in a potassium dichromate sensitizing solution, dried, then exposed to strong ultraviolet light through a photographic negative, hardening the gelatin in proportion to the amount of light reaching it. The tissue is then developed by treatment with warm water, which dissolves the unhardened gelatin. The resulting pigment image is physically transferred to a final support surface, either directly or indirectly. In an important early 20th century variation of the process, known as ''carbro'' (carbon ...
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Color Scientists
Color (or colour in Commonwealth English; see spelling differences) is the visual perception based on the electromagnetic spectrum. Though color is not an inherent property of matter, color perception is related to an object's light absorption, emission, reflection and transmission. For most humans, colors are perceived in the visible light spectrum with three types of cone cells ( trichromacy). Other animals may have a different number of cone cell types or have eyes sensitive to different wavelengths, such as bees that can distinguish ultraviolet, and thus have a different color sensitivity range. Animal perception of color originates from different light wavelength or spectral sensitivity in cone cell types, which is then processed by the brain. Colors have perceived properties such as hue, colorfulness (saturation), and luminance. Colors can also be additively mixed (commonly used for actual light) or subtractively mixed (commonly used for materials). If the ...
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1920 Deaths
Events January * January 1 ** Polish–Soviet War: The Russian Red Army increases its troops along the Polish border from 4 divisions to 20. ** Kauniainen in Finland, completely surrounded by the city of Espoo, secedes from Espoo as its own market town. * January 7 – Russian Civil War: The forces of White movement, Russian White Admiral Alexander Kolchak surrender in Krasnoyarsk; the Great Siberian Ice March ensues. * January 10 ** The Treaty of Versailles takes effect, officially ending World War I. ** The League of Nations Covenant enters into force. On January 16, the organization holds its first council meeting, in Paris. * January 11 – The Azerbaijan Democratic Republic is recognised de facto by European powers in Palace of Versailles, Versailles. * January 13 – ''The New York Times'' Robert H. Goddard#Publicity and criticism, ridicules American rocket scientist Robert H. Goddard, which it will rescind following the launch of Apollo 11 in 1969. * Janua ...
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1837 Births
Events January–March * January 1 – The destructive Galilee earthquake causes thousands of deaths in Ottoman Syria. * January 26 – Michigan becomes the 26th state admitted to the United States. * February 4 – Seminoles attack Fort Foster in Florida. * February 25 – In Philadelphia, the Institute for Colored Youth (ICY) is founded, as the first institution for the higher education of black people in the United States. * February – Charles Dickens's '' Oliver Twist'' begins publication in serial form in London. * March 1 – The Congregation of Holy Cross is formed in Le Mans, France, by the signing of the Fundamental Act of Union, which legally joins the Auxiliary Priests of Blessed Basil Moreau, CSC, and the Brothers of St. Joseph (founded by Jacques-François Dujarié) into one religious association. April–June * April 12 – The conglomerate of Procter & Gamble has its origins, when British-born businessmen William Procter and James Gamble begi ...
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George Eastman House
The George Eastman Museum, also referred to as George Eastman House and the International Museum of Photography and Film, is a photography museum in Rochester, New York. Opened to the public in 1949, is the oldest museum dedicated to photography and one of the world's oldest film archives. Known for its collections in the fields of photography and cinema, the museum is also a leader in film preservation and photograph conservation, educating archivists and conservators from around the world. Home to the 500-seat Dryden Theatre, the museum is located on the estate of entrepreneur and philanthropist George Eastman, the founder of Eastman Kodak Company. The estate was designated a National Historic Landmark in 1966. History The Rochester estate of George Eastman (1854–1932) was bequeathed upon his death to the University of Rochester. University presidents (first Benjamin Rush Rhees, then Alan Valentine) occupied Eastman's mansion as a residence for ten years. In 1948, th ...
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Heliochrome
A heliochrome is a color photograph, particularly one made by the early experimental processes of the middle 19th to early 20th centuries. The word was coined from the Greek roots "helios", the sun, and "chroma", color, to mean "colored by the sun". It was applied to images as technologically diverse as Levi Hill's "Hillotypes" of the 1850s (Hill's instruction book was entitled ''A Treatise on Heliochromy''), the three-color carbon prints made by Louis Ducos du Hauron in the 1870s, and the interference color photographs made by Gabriel Lippmann Gabriel Lippmann ( ; 16 August 1845 – 12 July 1921) was a French physicist who received the Nobel Prize in Physics in 1908 "for his method of reproducing colours photographically based on the phenomenon of interference". Early life and educa ... in the 1890s. It was also occasionally misapplied to images whose color was non-photographic, i.e., due to local coloring by handwork of some kind. References History of photography Pho ...
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France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlantic, North Atlantic, the French West Indies, and List of islands of France, many islands in Oceania and the Indian Ocean, giving it Exclusive economic zone of France, one of the largest discontiguous exclusive economic zones in the world. Metropolitan France shares borders with Belgium and Luxembourg to the north; Germany to the northeast; Switzerland to the east; Italy and Monaco to the southeast; Andorra and Spain to the south; and a maritime border with the United Kingdom to the northwest. Its metropolitan area extends from the Rhine to the Atlantic Ocean and from the Mediterranean Sea to the English Channel and the North Sea. Its Regions of France, eighteen integral regions—five of which are overseas—span a combined area of and hav ...
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Photogram
A photogram is a Photography, photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed for a shorter time or through transparent or semi-transparent objects appear grey, while fully-exposed areas are black in the final print. The technique is sometimes called cameraless photography. It was used by Man Ray in his #Man Ray's 'rayographs', rayographs. Other artists who have experimented with the technique include László Moholy-Nagy, Christian Schad (who called them "Schadographs"), Imogen Cunningham and Pablo Picasso. Variations of the technique have also been used for scientific purposes, in shadowgraph studies of flow in transparent media and in high-speed Schl ...
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Stereoscopy
Stereoscopy, also called stereoscopics or stereo imaging, is a technique for creating or enhancing the depth perception, illusion of depth in an image by means of stereopsis for binocular vision. The word ''stereoscopy'' derives . Any stereoscopic image is called a stereogram. Originally, stereogram referred to a pair of stereo images which could be viewed using a stereoscope. Most stereoscopic methods present a pair of two-dimensional images to the viewer. The left image is presented to the left eye and the right image is presented to the right eye. When viewed, the human brain perceives the images as a single 3D view, giving the viewer the perception of Three-dimensional space, 3D depth. However, the 3D effect lacks proper focal depth, which gives rise to the Vergence-accommodation conflict. Stereoscopy is distinguished from other types of 3d display#3D displays, 3D displays that display an image in Three-dimensional space, three full dimensions, allowing the observer to ...
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Anaglyph Image
Anaglyph (Greek ''ana''+''gluphein'' - "to carve") may refer to: * Anaglyph 3D, a method of encoding a three-dimensional image in a single picture by superimposing a pair of pictures * Ornament (art) carved in low relief See also * Glyph (other) A glyph is a type of mark. Glyph may also refer to: Arts, entertainment and media * Glyph (Transformers), Glyph (''Transformers''), a fictional character * Glyph (album), ''Glyph'' (album), by Floater * Glyph Comics Awards, a comics award Scien ...
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Edmond Becquerel
Alexandre-Edmond Becquerel (; 24 March 1820 – 11 May 1891) was a French physicist who studied the solar spectrum, magnetism, electricity, and optics. In 1839, he discovered the photovoltaic effect, the operating principle of the solar cell, which he invented in the same year. He is also known for his work in luminescence and phosphorescence. He was the son of Antoine César Becquerel and the father of Henri Becquerel, the discoverer of radioactivity. Biography Born in Paris, Becquerel was the pupil-turned-successor of his father at the Muséum national d'histoire naturelle. He was also appointed professor at the short-lived Agronomic Institute in Versailles in 1849, and in 1853, received the Chair of Physics at the Conservatoire des arts et métiers. He was associated with his father in much of his work. The first photovoltaic device In 1839, at age 19, while experimenting in his father's laboratory, Becquerel created the world's first photovoltaic cell. In this exper ...
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