Canon iR3530 Manual page 244

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Adjusting the Contrast
On the Special Features screen, press [Sharpness].
Press [Low] or [High] to adjust the sharpness ➞ press [OK].
To copy text or lines clearly, the setting should be towards [High]. To copy originals containing
printed photographs or other halftones, the setting should be towards [Low].
The selected mode is set.