I.R.I.S. IRIScan Pro 3 Cloud Button Manager - Manual (Page 33)

30
Background
Level
The pixel which is higher than the
background value will be adjusted to the
lightest point. Adjust the value for both
the Filter Threshold and Background
Level to produce the best optimal result.
Example, slightly adjusting the background value makes
your text more clear.
Original
Remove Blue, Threshold: 20, Background: 255