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What Is HLG HDR?

How is it different, is it better than HDR10?

Hybrid Log Gamma HDR or HLG HDR is a high dynamic range image standard developed by the British Broadcasting Corporation (BBC) and Japan Broadcasting Corporation (NHK). While it can be considered a competitor to other HDR standards such as HDR10, HDR10+ and Dolby Vision, it is designed more for broadcast TV than for streaming or locally produced media.

What is HLG?

HLG is an HDR standard designed to add HDR compatibility to broadcast TV signals, while maintaining the same simplicity of the broadcast data itself, without adding significant additional bandwidth requirements. It allows broadcasters to transmit a wide dynamic range signal compatible with HDR and SDR TVs, greatly reducing the cost and complexity of transmitting the signal.

HLG is royalty-free, and unlike other niche standards like Dolby Vision, it doesn’t use metadata to tell TVs how to display HDR content.

Do I need HLG for my new TV?

If you’re going to watch broadcast TV on your new TV, it’s best to buy an HLG-compatible TV, as it’s gradually being used more and more by broadcasters. For example, Sky UK announced in 2020 that its Sky Q satellite TV box would support HLG content in the future.

Some streaming content also uses the HLG HDR standard. For example, you can stream the BBC series Planet Earth II (some clips) and Blue Planet II from your iPlayer app using HLG HDR.

How does HLG work?

While the results are similar to other HDR standards, HLG HDR is designed for broadcast television, not primarily for local media streaming or playback. However, it works a little differently than HDR10, HDR10+, and Dolby Vision.

HLG encodes your HDR data into a single wide-range signal compatible with SDR and HDR TVs. Therefore, SDR TVs simply do not support other HDR standards. This halves the amount of transmission bandwidth required to stream content. However, an SDR TV attempting to play HLG content will show a standard picture, although more detail may appear in the highlights.

HLG HDR also achieves its enhanced dynamic range without the use of metadata. Dolby Vision and HDR use 10+ metadata to tell the display how, when and where to adjust brightness accordingly, and HLG discards information that is often lost during broadcasts.

Which TVs are HLG compatible?

The latest TVs from Sony, LG, Samsung and Panasonic support HLG on most flagship models. High-end TVs usually support this in addition to other HDR standards. However, it’s not as common as HDR10, especially among more niche manufacturers and projectors, despite its popularity every year.

Frequently Asked Questions

  • How do I know if my TV is HLG compliant?

    If you made an HDR TV in 2016 or later, it probably supports HLG HDR. You can also contact the manufacturer or look up the make and model online to determine if it is an HLG HDR TV.

  • What is HLG in camera?

    HLG is an HDR format sometimes used in photography. For example, on some cameras, this is a way to capture an HDR image for display on the screen. It can be saved in another format, such as an HSP file.

Content

What Is HLG HDR?

How does it differ, and is it better than HDR10?

Hybrid Log Gamma HDR, or HLG HDR, is a high dynamic range imagery standard developed by the British Broadcasting Corporation (BBC) and Japan Broadcasting Corporation (NHK). Although it could be considered a competitor to other HDR standards like HDR10, HDR10+, and Dolby Vision, it is designed more for broadcast TV than streaming or locally sourced media.

What Is HLG?

HLG is an HDR standard designed to both add HDR compatibility to broadcast TV signals and maintain a similar simplicity for the broadcast data itself, without adding much in the way of additional bandwidth demands. It allows broadcasters to transmit a signal with a wide dynamic range supported by HDR and SDR televisions, massively reducing the cost and complexity of the broadcast signal.

HLG is royalty-free, unlike more niche standards like Dolby Vision, and unlike the other HDR standards, it doesn’t use metadata to tell the TV how to display the HDR content.

Do I Need HLG in My New TV?

If you plan to watch broadcast TV on your new television, it’s a good idea to get one with HLG support, as it is gradually seeing increased adoption among broadcasters. For example, Sky UK announced in 2020 that its Sky Q satellite TV box would support HLG content moving forward.

Some streaming content also takes advantage of the HLG HDR standard. For example, you can stream the BBC’s Planet Earth II (some segments) and Blue Planet II series from its iPlayer app with HLG HDR.

How Does HLG Work?

Although the result is similar to other HDR standards, HLG HDR is designed for broadcast television rather than predominantly for streaming or local media playback. However, it does work a little differently to HDR10, HDR10+, and Dolby Vision.

HLG encodes its HDR data into a single wide-range signal compatible with both SDR and HDR televisions. As a result, other HDR standards are not supported at all by SDR TVs. That cuts the amount of transmission bandwidth required in half for broadcast content. However, SDR TVs that try to play HLG content will display a standard image—though there is some potential for additional detail in highlights.

HLG HDR achieves its improved dynamic range without the use of metadata, too. Where Dolby Vision and HDR 10+ use metadata to inform a display of how, when, and where to adjust brightness accordingly, HLG forgoes that information is often lost during a broadcast.

What TVs Support HLG?

Most recent TVs from Sony, LG, Samsung, and Panasonic have HLG support across most flagship models. High-end TVs, in general, tend to support it alongside other HDR standards too. However, it isn’t as prevalent as HDR10, especially in more niche manufacturers and projectors, although it is gaining in popularity with each passing year.

FAQ

How can I tell if my TV is HLG compatible?
If you have an HDR TV made in 2016 or later, it will likely be HLG HDR compatible. You can also check with the manufacturer or look up the make and model online to determine if it is an HLG HDR television.

What is HLG in a camera?
HLG is an HDR format sometimes used in photography. For example, on some cameras it is way to capture an HDR image for screen-based display. It may be saved in a different format, such as an HSP file.

#HLG #HDR

Tài Chính Kinh Doanh

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