QuickTime Player Banding (reduced bit depth) on playback

Hello,

I'm working on a beautiful animated film. I'm using ProResHQ as my main file format. I'm pregrading in Davinci Resolve. And I'm editing everything in Final Cut Pro X.

When playing, editing and rendering in FCPX, it looks perfect. It's being played back with full bit depth, with no visible gradient banding. When I'm exporting a master ProRes file, and then re-import in in FCPX for playback, it still looks perfect.

But when I'm playing that rendered master ProRes file in QuickTime Player, heavy banding appears in gradients. It looks like QuickTime Player is playing back the video in a lower bit depth.

My suspicion is that the graphics card on my machine (MacBook Pro Retina 2012, mid configuration, NVIDIA GeForce GT 650M 1024 MB) perhaps doesn't have the immediate horsepower to handle the full bit depth straight on? At least not to the system? And that FCPX is rendering the output in a colour safe software renderer, or something.

As I remember it, this behaviour of reduced bit depth appeared in one iteration of macOS, and stayed.

I don't know the reason behind it, but I can only speculate that it has to do with keeping the overall graphics memory footprint low on the system.

All I know is that FCPX is viewing at full bit depth, which means it's possible. And QuickTime Player is viewing a reduced bit depth, or something.

Is there any way to make QuickTime Player play back in full bit depth, on my system?

Or, are there any other quick to launch, no fuzz, high quality video playback apps someone can recommend, that always plays back ProRes in full bit depth?

I'm attaching an image to show you what it looks like.

On this white forum background it might not be aparent at first, so I overexposed it too, to make it more visible.