https://www.cnet.com/news/dolby-vision-is-coming-to-xbox-one-but-only-on-netflix-for-now/

Dolby Vision video streaming is coming to Xbox One S and Xbox One X consoles in the preview system update 1810, which began rolling out Wednesday, Xbox Wire reveals.

Dolby Vision is a high dynamic range (HDR) format for 4K TVs that provides improved contrast, brightness and colour to supported TVs by optimizing the image, "frame by frame." Traditional HDR is more "set and forget" -- once a setting is locked in, it remains that way. It is supported by streaming services such as Netflix, iTunes, Vudu and Amazon Prime Video.