HDMI ULTRA HD Deep Color
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If the device connected to the HDMI Input Port also supports HDMI ULTRA HD Deep Color, your picture may be clearer.
However, if the device doesn’t support it, it may not work properly.
In that case, change the TV’s HDMI ULTRA HD Deep Color setting to Off.
Supported Display Resolution

- On : Supports 4K@60 Hz (4:4:4, 4:2:2, and 4:2:0)
- Off : Supports 4K@60 Hz (4:2:0)

4K @ 50/60 Hz Support Format

Supported Display Resolution
Resolution | Frame rate (Hz) | Color Depth / Chroma Sampling
8 bit | 10 bit | 12 bit
3840 × 2160p 4096 × 2160p | 50 59.94 60 | YCbCr 4:2:0 | YCbCr 4:2:0 1) | YCbCr 4:2:0 1)
- | - | YCbCr 4:2:2 1)
YCbCr 4:4:4 1) | - | -
RGB 4:4:4 1) | - | -
1) Supported when HDMI ULTRA HD Deep Color is set to On.

You can only change the settings of the HDMI IN you are watching at the time.
You can specify a different setting for each HDMI port.