Dell S1709WFP User Manual page 14

Auto Adjust Even though your computer recognizes your monitor on startup, the Auto Adjustment function optimizes the display settings for use with your
particular setup.
Color Settings : Use the Color Settings menu to set the Input Color format and mode.
Choose RGB if monitor is connected to a PC or a DVD using a VGA cable.
Input Color Format
Choose YPbPr option if monitor is connected to a DVD by a YPbPr to VGA or if the DVD color output setting is not RGB.
NOTE:
Allows you to set the display mode to Graphics or Video according to the input signal.
Mode Selection
Select Graphics if you are connecting a computer to your monitor;
Preset Modes
Select Video if you are connecting a DVD player, STB, or VCR player to your monitor.
Allows you to set the color settings to one of the preset modes.
NOTE:In most cases, Auto Adjust produces the best image for your configuration.
The Dell S1709W Flat Panel monitor supports analog (VGA) input only.