Canon mp620 - Manual (Page 557)

Shadows may not be corrected properly depending on the document. If the page background is
not white, shadows may not be detected correctly or may not be detected at all.
While scanning, press down on the spine with the same amount of pressure you used to preview
the scan. If the binding part is not even, the shadow will not be corrected properly.
How to place the document depends on your model and the document to be scanned.
Note
Cover the document with black cloth if white spots, streaks, or colored patterns appear in scan
results due to ambient light entering between the document and the Platen.
If the shadow is not corrected properly, adjust the cropping frame on the preview image.
Adjusting Cropping Frames
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Page 557 of 815 pages Image Settings