[stoolzo]

On my screen, the banding pops up in dark areas. I noticed it intermittently for awhile, but the scene that finally made me research the problem and switch to LFL a few months ago was a scene in the La La Land Bluray. When Emma Stone sings her audition at the end, the lights all go out around her. With FLL, the area surrounding her is a whole bunch of dark bands, With LFL, it's totally smooth. Again, this may not be the case on your system. I'm only running a 1080p Vizio, so it's a pretty safe bet that your LG 4K is a much better monitor, and maybe ATI cards do better scaling than Nvidia cards, I'm not sure.

As far as changing my color space range, I have an Nvidia card, and I just push keyboard commands to the Nvidia Control Panel to do the switch. I use my flirc and a Logitech Harmony to push the key sequence, because I was lazy and it was convenient. However, you can also send key presses with batch files or a variety of automation programs. In my case, I push Windows+3, which starts my Nvidia Control Panel, Alt+o to select the Output dynamic range, arrow up to toggle from limited to full, and Alt+a to Apply the setting. I would guess you could do something similar with your ATI control panel or whatever it's called. It's not as elegant as using reg keys, but it does work.

ok, found the scene, its at 01:38. Thats not banding though, thats just common compression noise and I can see it using 444 and 420. I'm still thinking about going back to RGB though but 420 solves lots of problems for me, I use my HTPC as a full media center for web, photos etc so its a lot easier to not have change and mess with colour spaces and other settings, everything just works with 420 as it should.

I would change in a second though if someone can show me a clip that highlights banding created by 420, not only have not seen any that I know isnt present on the master but if you google it nothing comes up.