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Definitions (107)
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photosite
The light-sensitive cell on a digital image sensor, it records one intensity and one colour value. Information from several photosites is required to create a pixel in the image.
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ambient light
The light that exists in a specific situation without augmentation with flash or studio lights. Also known as 'available light'.
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aperture
The opening in the iris diaphragm of a lens that allows light to pass through the lens to the image sensor.
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aperture-priority
Usually denoted by the A (or Av) setting on a camera's mode dial, this shooting mode allows the photographer to set a specific aperture value while the camera will adjust the shutter speed automa [..]
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aps-c
A term originally developed for the 'Advanced Photo System' film format but now used to define a digital imaging sensor size that measures between 21.5 x 14.4 mm and 23.7 x 15.7 mm in area.
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archiving
Preserving digital images in a way that is independent of where these records are kept. Image archives can consist of prints or copies on optical disk or hard disk drive.
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artefacts
Undesirable visual defects produced by digital imaging systems. They can be generated by either input or output devices and include noise, colour casts, distortions and lost information. All degrade i [..]
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aspect ratio
The relationship between the horizontal and vertical dimensions of an image. The horizontal dimension is normally quoted first. A 35mm film frame has an aspect ratio of 3:2, as do most DSLR cameras. I [..]
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autofocus
A camera control that focuses the lens on the subject. Two types of AF are in common use, active infrared (IR) and passive contrast-based. The former fires a beam of infrared light at the subject and [..]
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