https://www.apple.com/hk/en/macos/catalina-preview/
Watch movies in 4K, HDR, and full screen, then download your favorite comic books and original shows to enjoy offline.
footnote 2. 4K, 4K HDR, 4K Dolby Vision, Dolby Atmos, and HDR10 content is available on all Mac models introduced in 2018 or later with 4K-resolution screens.
官方寫清楚只有上面嗰度
其他細節係唔同人唔同機種裝Catalina beta搵
已經有人響iMac 5K 2019度裝10.15某seed而個Apple
TV.app都仲係出唔到4K HDR/Dolby Vision,不過又有人話得但係無screenshot無盛
我覺得遲早會搞到,只係唔會係幾個月內搞掂,再者響個27" 500 nits 5K mon度睇4K HDR其實應該唔係想像咁好丁,HDR要響家庭影院距離+screen size仲要有接近1000nits先顯著