Xerox WorkCentre M165-M175-3093 - Manual (Page 111)

Quick Reference Guide Page 5-31
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x More Image Quality
Use this feature in addition to the settings selected using the Image Quality option,
to further enhance the quality of your output.
Options:
Contrast Adjusts the difference between the image densities within the scanned image.
Sharpness Increasing sharpness improves the sharpness of text; decreasing sharpness
reduces the moiré effect (wavy patterns) which sometimes affects halftone images.