HDR:
HDR stands for high dynamic range. HDR allows for deeper blacks and brighter whites this adds more contrast and depth to video content.
Control Center supports HDR.
Dolby Vision:
Dolby Vision is Dolby's proprietary HDR technology, it’s mostly used in movies.
Control Center does not yet support Dolby Vision.
HLG:
HLG stands for Hybrid Log- Gamma, which is an HDR standard developed by the BBC and NHK. HLG is supported by HDMI 2.0b, HVEC, VP9, H.264/MPEG-4 AVC. Services like BBC iplayer, Freeview play, Youtube and DirecTV support HLG.
Control Center does not yet support HLG.
