High Dynamic Range (HDR) technology has revolutionized the way we see images and videos on our screens. With its ability to accentuate colors, contrast and brightness, HDR has made watching content on our TVs and devices a more immersive experience. One of the latest HDR standards that has gained popularity is Hybrid Log-Gamma (HLG) HDR. Let’s take a closer look at what HLG HDR is and how it works.

What is HLG HDR?

HLG HDR is a new HDR format that is designed to optimize HDR content for broadcast and streaming services. The term “Hybrid Log-Gamma” refers to the way the format combines traditional gamma curves (used in standard dynamic range content) with logarithmic curves (used in HDR imaging) to create a more natural-looking image.

The HLG HDR format was jointly developed by the BBC and NHK (Japan Broadcasting Corporation) in 2016. It was created to make it easier and more cost-effective for broadcasters to transmit HDR content on standard TV channels without having to use additional equipment like set-top boxes.

How does it work?

HLG HDR enhances the dynamic range of an image by increasing the contrast between the darkest and brightest areas. In traditional SDR (Standard Dynamic Range) content, the gamma curve is used to transform the image’s luminance levels from the linear capture range to the non-linear display range used in most displays. However, in HLG HDR, the gamma curve is replaced by a hybrid curve that takes into account the characteristics of both SDR and HDR images.

In this format, the image’s peak brightness level is typically set at 1000 nits to ensure compatibility with HDR displays. The result is a more realistic and vibrant image that offers a better viewing experience.

Benefits of HLG HDR

One of the primary benefits of HLG HDR is its compatibility with traditional SDR TVs. Unlike other HDR formats like Dolby Vision, HLG HDR can be displayed on standard SDR TVs without any additional hardware or special setup. This means that broadcasters and streaming services can offer HDR content without having to worry about compatibility issues.

Another benefit is its flexibility when it comes to transmission. HLG HDR can be transmitted using conventional broadcasting methods, allowing broadcasters to offer HDR content without investing in expensive equipment.

Conclusion

HLG HDR is a new technology that promises to make HDR content more accessible and easier to display on standard SDR TVs. Its flexibility and compatibility make it a popular choice amongst broadcasters and streaming services. As HDR technology continues to expand, HLG HDR will likely become more prevalent in the coming years, offering viewers a more immersive and enjoyable viewing experience.