HDR and the industry that cried “wolf”
No such luck.
There are always several ways to skin a cat. Currently, several notions about how best to implement HDR are proposed or in practice. Loudest amongst the purveyors is DolbyVision, which is a closed standard. It launches alongside, among others, HDR-10, a SMPTE EOTF open platform adopted by the Blu-ray Disc Association (BDA) for 4K Ultra HD Blu-ray. Philips, working with Technicolor, and none other than the BBC have also proffered their own HDR variants.
Before proceeding, a couple of new terms need to be introduced to your video vocabulary.
First is "nits." Continuing a long tradition of extraordinary effort to confuse consumers, we now talk "nits" when describing brightness, where you were used to reading about foot-lamberts. A "nit" is also known as a candela-per-meter-squared and is only remotely related to the price of tea in China. Just know that there are about 3.4 of them to a foot-lambert if you want to compare them to your established references.
A more meaningful new term, "Color Volume" is one you should try to get your head around. Remember all the triangles you have seen in TV reviews that either depicted the red-green-blue color extremes of a standard (Rec. 601, Rec. 709, Adobe, DCI, etc.) or the measured result of what a product under review could actually produce? Sure you do. Now imagine a cone that has a base the shape of one of those triangles and a height equivalent to the maximum luminance that the display could produce. That product, in cubic anything, is color volume. Yup, the bigger the better.
Our new world of UHD color will shoot for the moon.
The ultra-triangle is defined in a spec called "ITU 2020 color space." The triangle is awesome, nearly the size of most of the colors that are visible to us homosapiens. We currently refer to it as a "container," acknowledging the fact that it may be some time before manufacturers can hit those lofty metrics.