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As the AV world tries to get a handle on Dolby Vision and HDR10, the imminent arrival of yet another HDR (High Dynamic Range) format – one that’s designed to beat Dolby Vision at its own game – has been largely overlooked.

This format is HDR10+ and it’s the creation of Samsung, which sells more TVs around the world than any other brand.

But is this new HDR format a cause for celebration or consternation? On one hand, it muddies the already-confusing TV-spec waters but, on the other, HDR10+ looks and sounds great.

What is HDR10+?

Like Dolby Vision, HDR10+ is all about adding dynamic metadata to the HDR signal.

Standard HDR10 uses static metadata, which means the boundaries of brightness are set at the start of a film or show and don’t budge for the duration.

These boundaries have to be broad enough to display every scene of the film – essentially, the TV’s 1.07 billion colours are spread evenly across that entire brightness spectrum, which means that if a scene contains only bright or only dark elements, only a portion of those colours are available for it. This can result in dark scenes looking a bit dim and bright scenes losing detail.

With dynamic metadata, those brightness boundaries can be set and changed on a frame-by-frame basis, so the full colour range can be deployed even in scenes that contain only dark or only light elements. The result, in theory, is subtler gradients and therefore more detail.

We’ve already seen this in action with Dolby Vision. The Power Rangers 4K Blu-ray isnoticeably improved in Dolby Vision when compared to HDR10, particularly in regard to bright lights in otherwise dark scenes and subtle details in bright areas of an image. In short, it’s a more exciting, enticing and nuanced picture.

How is HDR10+ different to Dolby Vision?

At their core, HDR10+ and Dolby Vision are similar – they both use dynamic metadata to tweak a TV’s performance to get the most out of every frame – but there are key differences.

For a start, while TV manufacturers and studios have to pay Dolby to license Dolby Vision, and therefore have little control over its development and implementation, HDR10+ is a free, open format that any company, including Samsung’s rivals, can tweak and deploy as it sees fit.

This should make it appealing to those who don’t want to pay a fee or hand over control of the process in order to introduce support for dynamic metadata.

Similarly, Samsung claims because the TV manufacturers have more control when it comes to HDR10+, they can more effectively tailor it for different models in their ranges.

According to Samsung, mid-range TVs will benefit most from the addition of HDR10+ because the format will allow them to adapt the image to models with a more limited brightness spectrum to suit their abilities.

On the other hand, as a layer of dynamic metadata for HDR10, HDR10+ carries over the limitation to 10-bit colour depth. Dolby Vision goes up to 12-bits, making it capable of reproducing billions more colours.

With 12-bit TVs still the stuff of fantasy, this isn’t a big deal yet - but when they do finally become reality this could be a big differentiator. Of course, there’s every chance that new, open formats (HDR12 and HDR12+, perhaps?) will also arrive at that point.

Is HDR10+ actually any good?

HDR10+ is currently limited to Amazon Prime Video on select Samsung TVs in the USA but we’ve been unable to conduct our own tests of the format. We have, however, seen the tech as presented to us by Samsung and Panasonic. While demos such as this can’t be relied upon to draw firm conclusions, they’re certainly enough to get us excited.

Next to a standard HDR10 image, HDR10+ seems punchier, more dynamic and adds more depth to the picture - but, importantly, doesn’t alter the fundamental character of the picture. The whitest elements and brightest colours look brighter, while the blackest areas become more pronounced. But nothing becomes overblown or unrealistic.

In fact, in many areas there’s greater nuance and detail – bright skies that are over-saturated in HDR10 reveal subtle gradations of colour and thin, light-grey clouds in HDR10+.

In short, the result isn’t just more dynamism, it’s a more detailed, more solid and more three-dimensional image that draws you in more effectively.

These are exactly the type of improvements we expect to come from the introduction of dynamic metadata, and the fact HDR10+ offers improvements over HDR10 isn’t much of a surprise.

The more interesting question is how it compares to Dolby Vision. Right now there’s no way for us to test that, but 2018 will hopefully be the year we're able to find out..

How can you get HDR10+?

CES 2018 shed some light on the near future of HDR10+'s device support. And, as you might expect, select Samsung 2018 TVs support the format. 

Along with Samsung and 20th Century Fox, Panasonic is one of the three founding members of the HDR10+ Alliance, so it's not surprising its two 2018 OLED ranges are onboard. Three of its five 2018 4K Blu-ray players, the DP-UB9000, DP-UB820 and DP-UB420, will also add support for HDR10+ (with the UB9000 and UB820 also supporting Dolby Vision).

As for legacy models, all of Samsung’s 2017 HDR TVs have a picture-processing engine that supports HDR10+ too, but a firmware update will be needed to activate the feature. Likewise, Panasonic's higher-end 2017 TVs (the EZ1002, EZ952, and EX750) are all due a firmware upgrade to add HDR10+ this year, too.

Fox’s early involvement importantly put a content producer on the map, and in January 2018, Warner Bros. Home Entertainment also confirmed its support for the format. While Amazon isn’t yet part of the HDR10+ Alliance, the format is already accessible on Amazon Prime Video for a select few TV owners in the USA. Wider availability is still to be confirmed.

Despite growing industry support, recently confirmed compatibility for more hardware, and the firming up of certification for devices (which will be performed by a third-party testing centre, with certified products naturally bearing the new HDR10+ logo), we still don’t have a release date for the first wave of 4K Blu-ray HDR10+ discs, although we are expecting to see them by the end of 2018.

What we do know is that HDR10+ Ultra HD Blu-ray will be shown for the first time later this month (April) at the National Association of Broadcasters (NAB) convention in Las Vegas.

Will more manufacturers adopt HDR10+? 

Philips is the latest TV brand to come out in support for HDR10+, adopting the format instead of Dolby Vision for its 2018 TVs.

Beyond that there’s not much to go on. We expect the fee-free nature of HDR10+ to make it a no-brainer for many manufacturers, but would LG even consider supporting a format created by its arch-rivals? Despite LG being the champion of broad HDR format support so far, we think it seems very unlikely.

While it would be easier if there was just one HDR format, there’s nothing stopping TV manufacturers and content producers from supporting both. Those that do will almost certainly have an advantage unless one format manages to kill the other. Game on.