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Photography is a combination of two scientific processes: an optical and a chemical one. The development of the modern camera took place over hundreds of years, starting with a pinhole, progressing to a simple lens projecting on a wall, to our modern cameras today.
The camera obscura (Latin for "dark room"), dating back to antiquity, was the predecessor of the first cameras. The camera obscura was originally a dark room with a hole in one wall. The hole acted like a crude lens, projecting an image of the outside world onto a piece of paper mounted on the opposite wall. The pinhole was mainly used for scientific purposes in astronomy and, fitted with a lens, as a drawing aid for artists. The images however were upside down and not very sharp. The portable box-form of the camera obscura which produced a sharp image on translucent paper led eventually to the development of the photographic camera. The introduction of a biconvex lens reduced distortion and increased clarity. In 1826, Joseph Nicéphore Nièpce created the first permanent image with a camera obscura, a view from a window near Chalon-sur-Saône, with an exposure time of some eight to ten hours.
A photographic image is produced by the chemical reaction of metallic salts to light. For centuries scientists have been experimenting with the reaction of light to several metallic salts. In 1802 for instance, Thomas Wedgewood experimented with paper soaked in silver nitrate. The images however, were not permanent, they turned black in light.
Digital cameras capture images electronically and convert them into digital data that can be stored and manipulated by a computer.
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Like conventional cameras, digital cameras have a lens, aperture, and shutter, but they don't use film. When light passes through the lens it is focused on a photo-sensitive electronic chip called a charged coupling device (CCD). The CCD converts light impulses into electrical impulses (also called analog signal forms). The signals are fed into a microprocessor and transformed into digital information. This process is called digitization.
Although digital images do not yet match the quality of pictures produced on film, they represent an enormously flexible medium. Photographers are no longer limited by the physical properties of chemistry and optics. Computers outfitted with the appropriate software can augment and transform images in ways never before imagined.
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