Some non-HDR televisions have a setting called Wide Color Gamut (WCG) which allows them to display a wider than average color gamut and should usually be enabled with HDR content. Options such as “dynamic contrast” can generate color banding in the image. If you have adjusted these settings accordingly and still see bands instead of color gradients, try disabling any video processing features that are enabled. A quick tour of the image settings menu is necessary to avoid color gradient solarization.
If you do not activate this option, there is a risk of posterization. It is necessary to activate the “Deep Color”, “full color” or “extended color” (the name can be different according to the manufacturers) feature.
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When watching an HDR movie with a 4K UHD Blu-ray player, you should also make sure that the output settings of the player and those of the HDMI input it is connected to are correct. Deep Color compatible TVs and models that support HDR and Dolby Vision content are capable of this. The first thing to do is to check the specifications of your television to see if it is able to display images with significant color depth.
What are the solutions in case of posterization? Ultra HD Premium certified and compatible with Dolby Vision, HDR10, HDR10+ and HLG, the Panasonic TX-55HZ1000E OLED TV allows you to enjoy HDR images without color gradient posterization. It is therefore important to have a UHD 4K TV capable of supporting 10-bit colors (this is the case for most HDR10 and Dolby Vision compatible TVs). With the development of HDR video content, images with 10-bit encoded colors are more and more common.