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Photography Definitions and Factiods
Digital photography
The process of electronic acquisition, the equivalent of taking a photograph, is often referred to as image capture.
Light intensity is detected in digital camera by an photosensor. This is normally a charge-coupled device (CCD), although complementary metal oxide silicon (CMOS) devices are beginning to appear in some systems. See also Charge-coupled devices.
When photons strike the sensor, they give up energy. This causes electrons to be emitted, turning the energy of the photons into electrical energy. The number of electrons that are emitted can be measured to determine how many photons struck the capture element, and from this the scanner can generate a value for the intensity of light arriving from the point on the original being analyzed.
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