Canon PIXMA MG4200 Series On-Screen Manual page 672

Paper Size (L, A4, etc.)
Select an output paper size. The portion within the cropping frame will be scanned at the size of
the selected paper size. You can drag the cropping frame to enlarge/reduce it while maintaining
the aspect ratio.
Monitor Size (1024 x 768 pixels, etc.)
Select an output size in pixels.
A cropping frame of the selected monitor size will be displayed and the portion within the cropping
frame will be scanned. You can drag the cropping frame to enlarge/reduce it while maintaining the
aspect ratio.
Add/Delete...
Opens the Add/Delete the Output Size dialog, in which you can specify custom output sizes. You
can select this option when Destination is Print or Image display.
In the Add/Delete the Output Size dialog, you can specify multiple output sizes and save them at
one time. Saved items will be registered to the Output Size list and can be selected, along with
the predefined items.
Add
To add a size, enter Output Size Name, Width, and Height, then click Add. For Unit, you can
select inches or mm when Destination is Print but you can only select pixels when Destination
is Image display. The name of the added size appears in Output Size List. Click Save to save
the items listed in Output Size List.
Delete
To delete an item, select it in Output Size List and click Delete. Click Save to save the items
listed in Output Size List.
Important
You cannot delete predefined output sizes such as A4 and 1024 x 768 pixels.
Note
Save up to 10 items.
An error message appears when you enter a value outside the setting range. Enter a value
within the setting range.
Note
For details on whether or how the cropping frame is initially displayed on a preview image, see
Cropping Frame on Previewed Images in
Invert aspect ratio
Available when Output Size is set to anything but Flexible.
Click this button to rotate the cropping frame. Click again to return it to the original orientation.
Adjust cropping frames
You can adjust the scan area within the Preview area.
"Preview Tab" (Preferences dialog).