The erase function is used to erase shadows on images produced when scanning thick originals or books.
This function erases the parts of the image where shadows tend to form, but does not detect shadows and erase only the shadows.
Scanning a thick book
Not using the erase function Using the erase function

Shadows appear in the image.
No shadows appear.
Erase modes
If a ratio setting is used in combination with an erase setting, the erase width will change according to the selected ratio. This function erases the parts of the image where shadows tend to form, but does not detect shadows and erase only the shadows.
For example, if you set an erase width of 1/2" (10 mm) and reduce the image to 70% before transmission, the erase width will be reduced to 7 mm.
To change the default erase width setting:
Select [System Settings] → [Image Send Settings] → [Operation Settings] → [Default Settings] → [Erase Width Adjustment].
The width can be set from 0" to 1" (0 mm to 20 mm). The factory default setting is 1/2" (10 mm). The setting changed here will apply to [System Settings] → [Copy Settings] → [Copy Setting] → [Erase Width Adjustment] in "Setting mode".