Dell 5110cn Color Laser Printer - Manual (Page 398)

-Br= mode
Specifies Brightness Adjustment.
Available brightness adjustment option values are as follows.
+5
Bright 5
+4
Bright 4
+3
Bright 3
+2
Bright 2
+1
Bright 1
0
Normal
-1
Dark 1
-2
Dark 2
-3
Dark
-4
Dark
-5
Dark
-RGBc= mode
Specifies RGB Color Correction.
Available RGB Color Corrections are as follows.
10
Perceptual