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  1. Measure the item to be scanned using Inches or Centimeters and set the calculator accordingly.
  2. Determine the DPI (dots per inch) setting of your scanner. This setting normally appears in the dialog screen of your Scanner's software.
  3. Enter the measurements in the space provided then select the scanner resolution setting.

Convert inches to Pixels
Formula: Inches X DPI = Pixels
Photo Width: Inches
Photo Height: Centimeters
Select the DPI setting
of the Scanner
Image Width: Pixels
Image Height: 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.

Handy Tip! If you plan to create a new logo or graphic using an image editor, Start by deciding the DPI setting which will be used to print your design. You can then enter the desired size of the graphic above and calculate the Pixel dimensions needed for the best print quality. (Your original work can be resampled for an appropriate size web image)