Canon CanoScan N650U Getting Started page 44

Precautions for Scanning at High Resolutions
Please note that file sizes increase almost exponentially as the resolution is
raised when scanning in color mode. Scanning at high resolutions may require
more time for scanning and image processing. You are recommended to avoid
raising the resolution beyond the minimum requirement to scan in color mode.
File Size Estimates for Scanning a Letter Size Original in Color
- 100 dpi 3 MB
- 300 dpi 26 MB
- 600 dpi 105 MB
- 1200 dpi 418 MB
Resolution Guidelines
• For uploading to a web site or viewing on a computer monitor, choose 72 dpi
• For scanning print photos and magazine clippings, choose 150 - 300 dpi
• For printing on a inkjet printer, choose a resolution approximately half the
printer's rating (180 dpi, 360 dpi, 720 dpi)
A resolution of 1200 dpi is effective for scanning relatively small originals that
will be blown up to larger sizes for printing (i.e. blowing up a 3.5 x 5 in. image
to letter size).
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N650U/N656U/N1220U Getting Started