Canon PIXMA MG4200 Series On-Screen Manual page 660

previewing.
None
No cropping frame will be displayed after previewing.
Cropping Size for Thumbnail View
Select the cropping size for thumbnails of scanned documents.
Larger
Displays 105% (in width and height) of the area displayed for the standard size.
Standard
The standard size.
Smaller
Displays 95% (in width and height) of the area displayed for the standard size.
Note
When you change the Cropping Size for Thumbnail View setting, the preview images will be
refreshed and cropped to the new size. As the preview images are refreshed, the color adjustments
and other settings applied to them are reset.
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