Manual

Quick Reference Guide Page 5-31
Fax
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.