CCD (Charged - coupled device)
The primary type of light sensitive sensor used in desktop scanners and electronic cameras. CCD's are miniture devices consisting of hundreds or thounsands of minute cells containg a photo diode which detects light, and a capacitor which stores an electronic charge. Each cell, called a picture element ( pixel), is charged with electricity proportional to the density od an original image ( or scene). Some CCDs used difficulty distinguishing a full range of tones or small differences between shadow details. CCds used in professional level scanners overcome most of these deficiencies.
22 Megapixel 645 format
5 Megapixel 4/3 format
6 Megapixel 1/2.5 format
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© Lloyd Godman