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Image scanner - Wikipedia, the free encyclopedia |
 | | In computing, a scanner is a device that analyzes an image (such as a photograph, printed text, or handwriting) or an object (such as an ornament) and converts it to a digital image. |
 | | A flatbed scanner is usually composed of a glass pane (or platen), under which there is a bright light (often xenon or cold cathode fluorescent) which illuminates the pane, and a moving optical array, whether CCD or CIS. |
 | | Scanners typically read red-green-blue color (RGB) data from the array, process it with some proprietary algorithm to correct for different exposure conditions, and send it to the computer via the device's input/output interface (usually SCSI or USB, or LPT in machines pre-dating the USB standard). |
| en.wikipedia.org /wiki/Image_scanner (1960 words) |
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