Dell 3110cn Color Laser Printer - Manual (Page 410)

Bright 2
+1
Bright 1
+0
Normal
-1
Dark 1
-2
Dark 2
-3
Dark 3
-4
Dark 4
-5
Dark 5
-RGBc=mode
Specifies RGB color correction.
Available RGB color corrections are as follows.
10
Perceptual
11
Saturation
12
RelativeC
13
AbsoluteC
This option is available only for color printing and when entry data is RGB data.
-RGBPr=mode