I would also like to understand this a bit better. Really hoping that posterisation is not an actual hardware issue.Would there be any situation where this isn't simply settings based and could be a hardware issue? I'm wondering if that is what Curtis is inquiring about. I have witnessed similar phenomenon on high quality blu-rays and 4K UHD discs using stock Filmmaker or Dolby Vision Cinema modes. I wouldn't be surprised if this was just present on streaming or cable sources.