Canon imageRUNNER C3100 N Printer Manual page 40

I Density
2
I Toner Save
2-10 Settings Menu
Yellow: -8 to 8; 0 *
Magenta: -8 to 8; 0 *
*
Cyan: -8 to 8; 0
Black: -8 to 8; 0 *
This setting adjusts the print density of the respective colors.
Pressing [Dark] makes the print image darker, pressing [Light] makes the image
lighter. This setting has 17 levels you can adjust, with level '0' (middle level) being
the default setting.
NOTE
This function is not available if the Toner Save option is set to 'On'.
On, Off *
This setting determines whether Toner Save is enabled. Toner Save uses less
toner to print documents and may result in longer toner life.
NOTE
If [On] is selected for Toner Save, very light or finely detailed images may not be
printed clearly.