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Qualcomm has a new 4K HDR feature, but which devices support it?

Qualcomm has a new 4K HDR feature, but which devices support it?
From Engadget - December 8, 2017

To be fair, the answer is somewhat complicated, and has more to do with the way HDR video and displays are defined rather than the lack of capable screens.

While HDR photography has a clear-cut specification, when it comes to video the term 'HDR' serves as a sort of catch-all for various standards, according to Qualcomm's marketing manager for camera and computer vision PJ Jacobowitz. "It's understandable that consumers are confused," he told Engadget.

What people want is a standard that lets them know which devices will work with the content, whether they be smartphones or giant TVs. It's like when you see a gadget with the Bluetooth logo on it -- you know it will pair with other Bluetooth devices.

In the high-res HDR space, though, there are myriad competing standards. There's HDR10, which is a common, open specification, along with Dolby Vision, which is proprietary. Before I go into HDR10's requirements, you need to understand what the Snapdragon 845 records. It uses the Rec 2020 color space, which has 70 percent more colors than the typical Rec 709 profile (which is similar to the sRGB gamut). The 845 also captures 10-bit footage (deeper colors than the usual 8-bit quality), as well as luminance (that's the brightness of each hue) of up to 10,000 nits.

For a device to display HDR10 content, it will need to use the Rec 2020 color space and a bit-depth of 10 bits. But HDR10 does not consider resolution, which is where other standards come in.

You will see logos from the UHD Alliance certifying devices as compatible with "Ultra HD Premium" or "Mobile HDR Premium," which add resolution requirements to color profile criteria.

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