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Earliest known, surviving heliographic engraving in existence. The image is of a 17th Century Flemish engraving showing a man leading a horse.
View from the Window at Le Gras (1826). Generally considered the first surviving stabilized photograph of a scene from nature taken with a camera obscura.
A photograph (often shortened to photo) is an image created by light falling on a light-sensitive surface, usually photographic film or an electronic imager such as a Charge-coupled device or a Complementary metal–oxide–semiconductor chip. Most photographs are created using a camera, which uses a lens to focus the scene's visible wavelengths of light into a reproduction of what the human eye would see.
Psychologists have used photographs in a number of ways: