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The first thing to be considered is the number of passes taken by the scanner to scan the image. A pass is the sweep that the scanner takes to cover the whole document and scan it completely. A single pass scanner is a very good one, as it saves time and also scans the whole document in a single sweep. As the number of passes or sweeps increase, the image clarity and resolution decreases, thus decreasing the image clarity. So, the lesser the passes, the more clearer and good the quality.

Scanners make it possible for families to preserve their old photos and then keep them for personal use or share it for the rest of the world to see on the Internet. More importantly, scanners have also been around fulfilling all the text and graphic reproduction functions for businesses. Indeed, the old copiers of yesterday have already been replaced with today’s scanners.