The scanner. scanner defined:. A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black-and-white only, or color.
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A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display.
IN THE PAST AND NOW
1-Drum ScannersDrum scanners capture image information using photo multiplier tubes (PMT) technology unlike the charged coupled device (CCD) used in flatbed scanners and film scanners.
Another type of scanner is the flatbed scanner. A flatbed scanner is usually made of a glass pane, which is illuminated with a bright light found underneath, and a moving optical CCD or CIS array.
A Hand scanner is a manual device that is dragged across the surface of the image to be scanned. Scanning documents in this manner is difficult as this requires a steady hand, to avoid uneven scanning rate that would produce distorted images.
advantages:1) Scans anything.2) light and portable.3) Old document can be kept in digital form.4) Fast and convenient to have a copy done.disadvantages:1) Only can scan on the surface but not above it.2) Quality of scan not the same as original .