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Using a Scanner

A basic desktop scanner is a device that looks and works something like a photocopier. It contains a lens and a glass platform that holds the original while you scan it. The lens is attached to a moving bar that slides up and down beneath the glass platform, “reading” the image one line at a time, and saving the data in a form the computer can reproduce on its screen. The scanner also has a built-in light that is color balanced to give you its best approximation of daylight. This helps assure that the color you see in the scanned image is accurate compared to the original. Some scanners have an additional carrier, drawer, or backlight on the cover so they can scan negatives and slides as well as prints. Most current scanners connect to the computer via a USB port or SCSI. At the time of this writing, only a few can use FireWire. Figure 4.1 shows a typical scanner.

Figure 4.1. This is a Microtek ScanMaker 5700.



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