Photography
Photography is the art, science, and practice of creating durable images by recording light (photons - hence, "photo"-graphy) or other electromagnetic radiation, either chemically by means of a light-sensitive material such as photographic film, or electronically by means of an image sensor.
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. The result in an electronic image sensor is an electrical charge at each pixel, which is electronically processed and stored in a digital image file for subsequent display or processing.
The result in a 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. This method is becoming obsolete as digital photography became more convenient and cheap.
World's First Photograph
Centuries of advances in chemistry and optics, including the invention of the camera obscura, set the stage for the world’s first photograph. In 1826, French scientist Joseph Nicéphore Niépce, took that photograph, titled View from the Window at Le Gras, at his family’s country home. Niépce produced his photo—a view of a courtyard and outbuildings seen from the house’s upstairs window—by exposing a bitumen-coated plate in a camera obscura for several hours on his windowsill.
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