Sorry if this has already been covered somewhere, but I did a quick search and couldn't find. Anyway I came across this video on youtube that covers some interesting things about setting up your HDR/Dolby Vision on your applet tv 4k. It seems like the initial setting is a little misleading, and as a result my TV was constantly on Dolby Vision mode whenever the Apple TV was on, which is not optimal and ends up giving you some weird colors. After adjusting the settings as instructed now my Dolby Vision or HDR only kicks on if the content supports it.
I don't know this guy, I just happen to come across the video:
I don't know this guy, I just happen to come across the video: