Oki MC573 Advanced Manual page 52

4
Press [Background Removal].
5
Select a value.
[3] for [Background removal] is the standard level. To increase a level of the document background removal,
select [4], [5], or [6]. To decrease a level of the document background removal, select [2], [1], or [OFF] (no
removal).
6
Press the (START) button.
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