Dell 5110cn Color Laser Printer - Manual (Page 382)

Specifies Screen.
Available Screens are as follows.
0
Fineness
1
Gradation
2
Auto
3
For Transparency
-Gg=mode
Specifies Gray Guaranteed.
Available Gray Guaranteed options are as follows.
on
On
off
Off
This option is available only for color printing.
-Ct
Specifies Color Transformation.
This option is available only for color printing.
-Br= mode
Specifies Brightness Adjustment.
Available brightness adjustment option values are as follows.
+5
Bright 5
+4
Bright 4
+3
Bright 3