Check Your Apple TV Settings — Once you have the right TV, the right cable, and the right content, you need to make sure that HDR is enabled on your Apple TV. For more helpful Apple TV tips, check out “Take Control of Apple TV,” which I’ve updated for the Apple TV 4K and tvOS 11. — I hope I’ve helped you get the most out of your Apple TV 4K’s picture quality, but here’s a sad confession: even though HDR is enabled on my Apple TV, I’m playing HDR content, and I’m using a high speed HDMI cable, I’m not certain that it’s actually reaching my TV.