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Topic on Glossary talk:High dynamic range (HDR)

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Putting aside that I'm wondering if we shouldn't eventually explain/link what a color space, gamut, and whatnot are (maybe also bit depth and chroma subsampling, given HDR can put a serious strain on the bandwidth of cables?), I just so happen to have a new HDR monitor and this recent linux commit made me ask what this actually implies.

Guess what, it's a mess. And among all: most official FAQs are bullshit.

For starters, everybody and their cousins refer to version numbers even though they are mostly meaningless for both displayport and HDMI (a bit like happened with VRR I guess) and even when they explicitly mention specific "minimum boundaries" they are wrong. Arguably, I could play and watch HDR content on my 290 only because AMD had the good will of updating their drivers sooner or later (and perhaps the luck of choosing flexible enough display controllers back in the days) but still.
(Nvidia and Intel weren't so courteous instead.. It's unknown if GCN 1.0 and Maxwell 1.0 are enabled then)

So what is the deal? <TBA>