Canon PIXMA MG4200 Series On-Screen Manual page 624

If an area is not specified, the document will be scanned at the document size (Auto Crop). If an area
is specified, only the portion in the specified area will be scanned.
Adjusting Cropping Frames
5.
Set Image corrections as required.
6.
Click Scan.
Areas framed by broken lines are scanned.
Note
A response of ScanGear after scanning can be specified in Status of ScanGear dialog after
scanning on the Scan tab of the Preferences dialog.
Scan Tab
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