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Most of the scanners will allow you to adjust DPI resolution from software. If you want to have great results, the scanning should be done a higher resolutions, then scaled down via software if needed.
Inch definition provided by Dictionary.com
An inch is a unit of length, 1/12 (0.0833) foot, equivalent to 2.54 centimeters.
Pixel definition provided by Dictionary.com
A pixel is the smallest element of an image that can be individually processed in a video display system.
There are many cases when you could need to convert inches to pixels. For example if you want to scan a image and you want to know how the page will look on a computer and what resolution it will have.