A great scanning resolution creates more pixels and a larger image. Flatbed scanner specifications are indicated using two numbers (optical resolution and positioning of the carriage stepping motor) such as 1200X2400 dpi. A scanner performs one horizontal row of pixels at a time and also advertises a maximum resolution which is useful only for line art mode and nothing else. The 2400 dpi flatbeds build the CCD differently and use two staggered larger arrays in a chip. Most scanners feature CCD sensors that use an optical lens and a system of mirrors to get the photo onto the CCD cells.
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