HP LaserJet 9000 Printer series - Manual (Page 195)

B Control panel menus 195
Configure device menu
Enhancement submenu
Item Values Explanation
DENSITY=4 0-8 Specifies contrast and brightness of the image.
0 =lightest
8 =darkest
SHARPNESS=3 0-6 Specifies the sharpness setting.
0 =minimum sharpness
6 =maximum sharpness
BACKGROUND
REMOVAL=2 0-8 Controls the amount of background material from the original that is eliminated
on the copy. Background removal is useful when you copy both sides and do not
want the material on the first side to be visible on the second side of the copy.
0 =minimum background removal (more background is visible)
8 =maximum background removal (less background is visible)