Canon MG6400 series Online Manual page 17

Note
Select the Adjust cropping frames checkbox to specify the area to be saved.
Adjusting Cropping Frames in the Image Stitch Window
To scan an item again, select the image in the Preview area or the thumbnail at
the top of the screen, then click
allowing you to scan the item again.
11. Click Save.
(Delete). The selected image is deleted,
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