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Additional Considerations - the 3,000-pixel rule
- Scanning at resolutions much higher than 600dpi may be required if the document is small in physical size.
- All digitized documents should be scanned such that each dimension of the visible area of the document (width, height) is comprised of a minimum of 3,000 pixels each. If a scan at 600 dpi does not meet this minimum, then the resolution should be increased and the document re-scanned accordingly.
- Extraneous image information (such as a calibration strip, record labels, or any part of the scanned image that does not directly pertain to the document itself) should not be included in this calculation.
- Example: a 3”x5” color photograph scanned at 600 dpi will render an image that is 1800 x 3000 pixels. As the width does not meet the minimum, a 600dpi scan will be unacceptable. The scan should be increased to 1200 dpi to render a 3600 x 6000 pixel image, and thus bring the image to an acceptable level of detail.