Canon CanoScan D646U Product Manual - Page 20
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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 an A4 Size Original in Color
- 75 dpi
1.6 MB
- 100 dpi
2.8 MB
- 150 dpi
6.3 MB
- 300 dpi
25.5 MB
- 600 dpi
102 MB
- 1200 dpi
408 MB
A4 color image
* These numbers are approximate and may differ from actual scan results.
Resolution Guidelines
• For uploading to a web site or viewing on a computer monitor, choose 75 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 higher than 600 dpi is effective in case for scanning relatively small originals that will be
blown up to larger sizes for printing.
6"(15cm)
4"(10cm)
The maximum size of a file scanned by the bundled PhotoStudio 2000 is limited by Windows Me/98
to 256 MB. Windows 2000 Professional does not impose these limits.
6.3 MB
2.8 MB
1.6 MB
75 dpi
100 dpi
150 dpi
Scanning at double
of the resolution
Scanning at half
of the resolution
3"(7.5cm)
408 MB
102 MB
25.5 MB
300 dpi
600 dpi
1200 dpi
12"(30cm)
8"(20cm)
2"(5cm)
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