An optical scanner, or just scanner, is a light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can use. A scanner is similar to a copy machine except that it creates a file of the document insted of a paper copy. The file that contatins the scanned object then can be stored on a disk, displayed on the screen, printed, faxed, sent via electronic mail, or included in another document. For example, you can scan a picture and then incorporate the picture into a brochure using a desktop publishing program.
When a document is scannedd, the results are stored in rows and colums of dots called bitmap. Each dot on a bitmap consists of one or more bits of data. The more bits used to represent a dot, the more colors and shade of gray that can be represented. For instance, one bit per dot is enough to represent simple one-color images, but for colors and shades of gray, each dot requires more than one bit of data. Today's......
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