Canon IMAGEFORMULA DR-2020U User Manual page 56

If you use Adobe Acrobat 9.0 with this machine and scan using the
Custom Scan method, you should display the scanner's Native
Interface because you will not be able to scan correctly on the
specified paper size.
Procedure for Showing the Native Interface in Custom
Scan
1
Click [Create], and then select [PDF from Scanner] -
[Custom Scan].
2
Click [Options] in the Custom Scan dialog box to open the
Scanner Options dialog box.
3
From the [User Interface] drop-down list, select [Show
Scanner's Native Interface], and then click [OK] to close
the dialog box.
The scanner runs the Custom Scan, and the Native Interface (the
machine's own scanner settings screen) is displayed.
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