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Commercial photography : ウィキペディア英語版
Photography

Photography is the science, art and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.
Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure. With an electronic image sensor, this produces an electrical charge at each pixel, which is electronically processed and stored in a digital image file for subsequent display or processing. The result with photographic emulsion is an invisible latent image, which is later chemically "developed" into a visible image, either negative or positive depending on the purpose of the photographic material and the method of processing. A negative image on film is traditionally used to photographically create a positive image on a paper base, known as a print, either by using an enlarger or by contact printing.
Photography is employed in many fields of science, manufacturing (e.g., photolithography) and business, as well as its more direct uses for art, film and video production, recreational purposes, hobby, and mass communication.
==Etymology==

The word "photography" was created from the Greek roots φωτός (''phōtos''), genitive of φῶς (''phōs''), "light"〔(φάος ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕 and γραφή (''graphé'') "representation by means of lines" or "drawing",〔(γραφή ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕 together meaning "drawing with light".
Several people may have coined the same new term from these roots independently. Hercules Florence, a French painter and inventor living in Campinas, Brazil, used the French form of the word, ''photographie'', in private notes which a Brazilian photography historian believes were written in 1834. Johann von Maedler, a Berlin astronomer, is credited in a 1932 German history of photography as having used it in an article published on 25 February 1839 in the German newspaper ''Vossische Zeitung''. Both of these claims are now widely reported but apparently neither has ever been independently confirmed as beyond reasonable doubt. Credit has traditionally been given to Sir John Herschel both for coining the word and for introducing it to the public. His uses of it in private correspondence prior to 25 February 1839 and at his Royal Society lecture on the subject in London on 14 March 1839 have long been amply documented and accepted as settled facts.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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