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Formula: Inches X DPI = Pixels
Scanners typically allow the DPI resolution to be adjusted via software. For best results, scanning should be done at the resolution of the intended output device.
Example: You wish to scan an item of jewelry and print the item in your catalog with the caption "Shown Actual Size." If the catalog will be printed on a 600 DPI printer, the item should be scanned with a resolution of 600 DPI, and care should be taken not to re-size or resample the intermediate image file before printing.
When the output destination is a computer screen, as in the case of auction photos, the scanned image may require further reduction using an image editor before the image is physically small enough to fit on the viewer's screen.
Example: a book cover measuring 8 in. by 10 in. will produce an image height of 750 Pixels even when scanned at only 75 DPI. Because many older displays are set at 800 X 600 Pixels, the resulting photo will be taller that the display area and force scrolling.