Canon PIXMA MG4200 Series On-Screen Manual page 673

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 cropping frame will be scanned.
Adjusting Cropping Frames
Image corrections
Allows you to apply corrections to images.
Important
Apply Auto Document Fix and Correct fading are available when Recommended is selected
on the Color Settings tab of the Preferences dialog.
Note
Available functions vary by the document type selected in Select Source.
Apply Auto Document Fix
Sharpens text in a document or magazine for better readability.
Important
Scanning may take longer than usual when this checkbox is selected.
The color tone may change from the source image due to corrections. In that case, deselect
the checkbox and scan.
Apply Auto Document Fix may not be effective if the scan area is too small.
Correct fading
Corrects and scans photos that have faded with time or have a colorcast.
Reduce gutter shadow
Corrects shadows that appear between pages when scanning open booklets.
Important
For precautions on using this function, see
Color Pattern...
Allows you to adjust the image's overall color. You can correct colors that have faded due to
colorcast, etc. and reproduce natural colors while previewing color changes.
Adjusting Colors Using a Color Pattern
Important
This setting is not available when you select Color Matching on the Color Settings tab of
the Preferences dialog.
Perform Scan
Scan
Scanning starts.
Note
When scanning starts, the progress will be displayed. Click Cancel to cancel the scan.
Preferences...
The Preferences dialog opens and you can make scan/preview settings.
Preferences Dialog
Close
Closes ScanGear.
"Gutter Shadow Correction."