Canon imageFORMULA R30 User Manual page 52

To correct tilted documents and images
Place a check in [Automatically straightens skewed] under the [Basic]
tab, and then click [Setting] to display the [Deskew Settings] screen.
Select a correction method and click [OK].
Basic >
Automatically straightens skewed
: ON
Click the [Deskew] check box to ON. You can select either
[Straightens with angle of fed documents] or [Straightens with angle &
contents of fed documents].
52
Deskew :
Straightens with angle of
fed documents
Straightens with angle &
contents of fed documents