Canon MP490 series On-Screen Manual page 336

that cannot be placed away from the edges/
arrow (alignment mark) of the Platen may be
saved as PDF files. To save in a format other
than PDF, scan by specifying the file format.
Placing Multiple Documents
Allow 3/8 inches (1 cm) or more space between
the edges of the Platen and documents, and
between documents. Portions placed on the
diagonally striped area cannot be scanned.
Note
You can place up to 12 documents.
Positions of slanted documents (10 degrees
or less) are corrected automatically.
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