Canon iR3245 Manual page 404

1. Select the desired User Inbox number → place your originals → press
[Scan] → [Special Features] → [Sharpness].
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2. Press [Low] or [High] to adjust the sharpness → press [OK].
To scan text or lines clearly, the setting should be towards [High]. To scan originals
containing printed photographs or other halftones, the setting should be towards [Low].
4-150 Adjusting the Contrast (Sharpness)