Detailed information about all of the color profiles installed on your Mac (and used by connected cameras, printers, and displays) is provided in ColorSync Utility (in the Applications > Utilities folder). When done correctly, you can have 4K HDR DV 60 Hz within the bandwidth restrictions of HDMI 2.0. Click the pop-up menu next to Color profile on the right, then choose the profile you want to use. That includes the screen (TV), any equipment in between, the HDMI cables (18 Gbps recommended), the HDMI ports (HDMI 2.0) and the port configuration on the TV and any equipment in between, if applicable. The video format settings that are selectable, is what is detected as compatible with the connected hardware. Depending on other settings and content, 4:4:4 might cause other features to be dropped, to keep to bandwidth use under the HDMI 2.0 limits. Thus the 4:2:0 chroma setting is recommended. Delivery format video files are always 4:2:0, so 4:4:4 would increase the bandwidth needs without quality improvement. YCbCr can use less bandwidth than RGB, freeing up more bandwidth for other features (resolution, frame rate, HDR). You can't have crushed blacks when the tv is set to full range, it will either be washed out or correct. Edit: There's also a pretty simple rule to follow. Rgb low 0-255 (pc standard) and Tv should be set to full. YCbCr doesn’t have High and Low variations, so you can’t go wrong there. Rgb high 16-235 (tv standard) and TVs should be set to limited. The video streams are encoded using the YCbCr color space, and your TV accepts YCbCr, thus no conversion is needed by the Apple TV box.
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