Dell P1913 Monitor - Manual (Page 36)

Select the DVI-D input when you are using the Digital (DVI) connector. Press to select the DVI input source.
DisplayPort
Select the DisplayPort input when you are using the DisplayPort (DP) connector. Press to select the DisplayPort input source.
Color Settings Use Color Settings to adjust the color setting mode.
Input Color Format Allows you to set the video input mode to:
RGB: Select this option if your monitor is connected to a computer or DVD player using the VGA and DVI cable.
YPbPr: Select this option if your monitor is connected to a DVD player by YPbPr to VGA, or YPbPr to DVI cable; or if the DVD color output setting
is not RGB.