@Apple
Since the Apple TV 4K update to tvOS 15.X, when SDR Output is set to PC RGB Low (16-235) the Apple TV will send PC RGB High (0-255) and vice versa.
Additionally PC RGB will now send SDR metadata. Please make this toggleable as OTT devices may incorrectly tonemap for HDR.
I've always wondered how demo-worthy movies like Avatar, Kill Bill & Tron: Legacy would look like in @UHD4k HDR, so I re-graded them from 1080p SDR as a test showcase. youtu.be/n4y23oXKlHc