Ricoh Aficio MP C1800 Operating Instructions Manual page 8

Contrast
Adjusts the shades of an image.
See p.69 "Contrast".
Background Density
Adjusts the background density of an image.
See p.70 "Background Density".
Adjust U.C.R.
Adjusts the amount of black ink to express vividly the black areas in an image.
See p.70 "Adjust U.C.R.".
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AMA017S
AMA018S