HDR10, HDR10 +, HLG and Dolby Vision: what are the differences between HDR standards?

HDR is by far the new queen technology of recent years to improve the quality of the display of our screens. We drown however between the labels: HDR10, HDR10 +, HLG, Dolby Vision … The acronyms multiply. It's time to explain their differences.

HDR is undoubtedly the most important technology released in recent years for our screens. Covering a wider range of brightness, it allows you to find darker blacks, whiter whites, more nuanced colors and variations in intensity and brightness within a single image.
What make a television experience ever more impressive. However, finding one's way as a consumer is complicated because standards have multiplied over the months. Our file will explain the ins and outs of the main HDR labels.
What is the HDR10?

The HDR10 is a standard based on an open platform. It is so named because it is based on a 10-bit color scale (compared to 8 for a usual non-HDR image). The advantage of this standard is that if manufacturers follow its recommendations, they can implement it freely on their products.
It follows the Ultra HD Premium standard, the highest official certification for an Ultra HD device. Manufacturers must follow the following minimum configurations:
Definition: 3840 x 2160 pixels
Depth of colors: 10 bits
Color space: 90% or more of DCI-P3 space + compatible HDMI input Rec.2020
HDR: [LED] maximum brightness of at least 1000 cd / m², black levels less than or equal to 0.05 cd / m². [OLED] maximum brightness of at least 540 cd / m, black levels less than or equal to 0.0005 cd / m².
What is HDR10 +?

HDR10 + is a natural evolution of HDR10. To its material claims is added a new data: the video stream itself.
The video will send real-time settings information directly to optimize the final image, plan after shot. Here, the hardware is just as important as the software to ensure that the best image is displayed.
What is Dolby Vision?

Dolby Vision is a proprietary standard developed directly by Dolby, and is therefore not free. If it is often dueled with the HDR10, it goes technically further since it offers a quantization on 12 bits.
Above all, the certification is delivered by Dolby who will optimize the content of its creation to its distribution. The calibration of the master in post-production is for example also controlled by the company to guarantee the best final quality.
Its direct competitor is the HDR10 +, which allows videographers to create the necessary metadata without supervision.
What is HLG?
HLG, or Hybrid Log Gamma, is a free standard. It has been developed by the BBC and NHK and focuses mainly on HDR TV broadcasts.
It is now adopted by the DVB consortium, the ITU and also the HDMI Forum. However, it is rarely found outside of TV broadcasts.
What is HDR Pro, HDR Plus and others?
Out of these standards, we can also read some mentions like HDR Pro or HDR Plus on some televisions. These are not official certifications or standards.
This is especially for manufacturers a way to signify that their TV exceeds the technical specifications expected for SDR devices. Thus, we find behind these names TVs exceeding 100 nits without providing a full HDR experience, including 8-bit tiles rather than 10 bits.
These different standards currently coexist on different devices and different services. It is therefore important to check that your smartphone or TV is compatible with the format (s) used by your favorite services. For example, Netflix is ​​Dolby Vision and HDR10 compatible.

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