Canon Pixma MX520 Series Online Manual page 408

4. Preview
Select to preview the scanned data or not when saving the data on a USB flash drive.
5. ADF orientation
Select the orientation of the original document.
This setting item is not available when Photo is selected for Doc.type.
6. Reduce show-thru (Reducing show-through)
Characters on the back may show through when scanning a thin document such as a newspaper.
Select ON if characters seem to show through on the scanned document.
This setting item is not available when Photo is selected for Doc.type.
7. Descreen
A printout consists of minute dots to make characters or graphs. Interfering with each dot may result in
uneven shades or a striped pattern. Select ON if you notice any uneven shades or a striped pattern on
the scanned image.
This setting item is not available when Photo is selected for Doc.type.
Note
Even if ON is selected for this setting, some moire effects may remain if Unsharp mask is set to
ON. In that case, select OFF for Unsharp mask.
8. Unsharp mask
The outline of small characters or thin objects such as a hair or leaves on a photo can be accentuated.
Select ON if you want to accentuate the outline of the scanned data.