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 Quick Reference Guide 
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.   
Select a higher setting to produce more vivid blacks and whites for sharper text and 
lines.
Sharpness
Increasing sharpness improves the sharpness of text; decreasing sharpness 
reduces the moiré effect (wavy patterns) which sometimes affects halftone images.