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A scanner or in computing terms, an image scanner yet another revolutionary optical device that can instantly make a digital copy of an object, a photograph, a document or even handwritten notes. With an expansive field of usage, the scanner is most often a mandatory feature in any office or a place that deals with documentation, but as time has progressed the scanner has become a very common feature in many households as part of their home PC setup. The capability of the scanner to make a digital copy, when clubbed with a simple desktop printer makes the entire unit function like a photocopy device, proving extremely useful in a variety of situations.
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. Very high resolution scanners are used for scanning for high-resolution printing, but lower resolution scanners are adequate for capturing images for computer display. Scanners usually come with software, such as Adobe's Photoshop product, that lets you resize and otherwise modify a captured image.
Flatbed scanners, also called desktop scanners, are the most versatile and commonly used scanners. In fact, this article will focus on the technology as it relates to flatbed scanners.
Sheet-fed scanners are similar to flatbed scanners except the document is moved and the scan head is immobile. A sheet-fed scanner looks a lot like a small portable printer.
Handheld scanners use the same basic technology as a flatbed scanner, but rely on the user to move them instead of a motorized belt. This type of scanner typically does not provide good image quality. However, it can be useful for quickly capturing text.