HLG vs. PQ

Attribute	HLG	PQ
Dynamic Range	Up to 12 bits	Up to 10 bits
Color Depth	Up to 16 bits	Up to 12 bits
Peak Brightness	Up to 4000 nits	Up to 10000 nits
Gamma Curve	Hybrid Log-Gamma	Perceptual Quantization

Introduction

High Dynamic Range (HDR) technology has revolutionized the way we experience visual content on our screens. Two popular HDR formats, Hybrid Log-Gamma (HLG) and Perceptual Quantization (PQ), have emerged as leading contenders in the industry. In this article, we will compare the attributes of HLG and PQ to help you understand their differences and similarities.

Color Depth

One of the key differences between HLG and PQ lies in their approach to color depth. HLG is designed to work with a wider range of color depths, making it a more versatile option for content creators. On the other hand, PQ is optimized for a specific color depth, which can result in more accurate and consistent color reproduction.

Brightness Levels

When it comes to brightness levels, HLG and PQ also have distinct characteristics. HLG is known for its ability to adapt to different brightness levels, making it suitable for a variety of viewing environments. In contrast, PQ is designed to deliver a more consistent brightness level, which can result in a more uniform viewing experience.

Compatibility

Another important factor to consider when comparing HLG and PQ is their compatibility with different devices and platforms. HLG is widely supported by a range of manufacturers and streaming services, making it a popular choice for consumers. On the other hand, PQ is less widely supported, which can limit its availability on certain devices and platforms.

Encoding Efficiency

When it comes to encoding efficiency, HLG and PQ have different strengths and weaknesses. HLG is known for its efficient encoding process, which can result in smaller file sizes and faster streaming speeds. In contrast, PQ requires more bandwidth and processing power, which can impact the overall viewing experience.

Dynamic Range

Dynamic range is a crucial aspect of HDR technology, and both HLG and PQ offer impressive dynamic range capabilities. HLG is designed to deliver a more natural-looking image with a wider dynamic range, making it ideal for capturing real-world scenes. PQ, on the other hand, is optimized for a more cinematic look with a higher dynamic range, which can result in more dramatic and immersive visuals.

Conclusion

In conclusion, both HLG and PQ have their own unique attributes that make them suitable for different applications. HLG is a versatile option with wide color depth support and adaptive brightness levels, while PQ offers more consistent color reproduction and higher dynamic range capabilities. Ultimately, the choice between HLG and PQ will depend on your specific needs and preferences, so it's important to consider these factors carefully before making a decision.