The Flatbed Optical Scanner is an easy to use scanning device commonly used in offices, homes, schools, etc. Like other scanning devices, its main function is to convert photographs and other printed material to digital form.
It has a clear piece of glass surface where you place your printed material or document, underneath this glass is a fluorescent light that illuminates the image you wish to scan. Below this light are red, blue and green shaded sensors. Before you begin the scanning process, the cover is placed above the scanner to obstruct other kinds of light in the area. The light and the sensors replicate the image by reflecting against this cover. The sensors run along the glass as it reads the light reflection of the image. The image has to be placed correctly into the scanner for a better image output. Computer connection is of course needed in this process. The scanner cable should be plugged into an open port of the CPU. This allows you to see the scanned image in your monitor right after the scanning process.
The leading providers of flatbed scanners are Hewlett Packard, Canon, Epson, Microtek, Perfection and Nikon. Because of the emergence of Adobe Photoshop and other photo editing softwares, scanners can now be used to enhance old photographs or edit new ones. It can also be used to enhance old documents, receipts, certificates, etc.
Epson - Perfection 1660
HP - ScanJet 4570c
Microtek - ScanMaker 4900
Sources
http://www.ehow.com/how-does_4897815_flatbed-scanners-work.html
http://www.itreviews.co.uk/hardware/h438.htm
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