Canon i-SENSYS MF6140dn User Manual page 268

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Sharpness
Adjust this setting to emphasize the outline of the image or decrease the contrast.
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The direction of 2-sided original documents are not set.
Select this setting if the top and bottom of the images are the same on both pages.
Select this setting if the top and bottom of the images on each page are opposite each other.
To clearly capture halftone photos, adjust this setting to the appropriate level on the <-> scale.
This can counteract the effect of moiré patterns (uneven gradation and striped patterns).
To clearly capture text or lines, adjust this setting to the appropriate level on the <+> scale. It is
best suited for scanning blueprints and very weak pencil manuscripts.