Dell UZ2715H Monitor - Manual (Page 45)

Operating the Monitor | 45
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 HDMI cable (or DisplayPort cable); or MHL
devices using the MHL cable.
YPbPr: Select this option if your monitor is connected to a DVD
player by YPbPr using HDMI cable (or DisplayPort cable); or MHL
devices by YPbPr using the MHL cable.
Or if the DVD (or MHL devices) color output setting is not RGB.
Gamma Allows you to set the Gamma to PC or MAC.