Canon 3301B002 On-Screen Manual page 452

Scanning Images Larger than the Platen (Stitch Assist)
7.
Click Scan.
The left half of the document is scanned and appears in the Stitch-assist window.
8.
Place the right half of the document face-down on the Platen.
9.
Click Scan.
The right half of the document is scanned.
10.
Adjust the scanned image as required.
Use the icons to swap the left and right halves, rotate the image 180 degrees or enlarge/reduce the
image.
(Swap Left & Right)
Swaps the left and right halves.
Important
This function is not available while the image is enlarged/reduced.
Rotates right half of the image 180 degrees.
Important
This function is not available while the image is enlarged/reduced.
Rotate 180°
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