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Minimum Standards for Digital Photo Preservation

The minimum size for an image needs to be 3000 pixels in its longest dimension to be comparable with “acceptable” 35mm film image quality.

  • Scan an 8″ x 10″ original (print, slide or negative) at 300 dpi to produce a file that is 2,400 x 3,000 pixels.
  • Scan a 4″ x 5″ original (print, slide or negative) at 600 dpi to produce a file that is 2,400 x 3,000 pixels.
  • Scan a 35-mm original (print, slide or negative) at 2100 dpi to produce a file that is 2,000 x 3,000 pixels.

Source :: Digital Photographic Records, National Archives