One of the big selling points of a 4K Blu-ray disc is the HDR support. HDR10 is the default option on these discs, and it's something that helps the 4K discs stand head and shoulders above the Blu-ray discs and DVDs before it. On top of HDR10, some discs include Dolby Vision. In case you didn't know, Dolby Vision is a form of HDR that goes a little bit beyond what HDR10 has to offer. Not every TV is equipped with Dolby Vision capabilities, and some of them that say they have it don't get bright enough for it to make a true difference.
Source : https://www.pocket-lint.com/4k-blu-ray-dolby-vision-showcase/
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