Dell S2240T 21.5 Multi-Touch Monitor with LED - Manual (Page 33)

Operating the Monitor | 33
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.