In Sony cameras, HLG (Hybrid Log-Gamma) serves as an option for capturing and displaying high dynamic range (HDR) content. Developed collaboratively by the BBC and NHK, HLG is designed to offer an extended range of luminance levels, allowing for more detail in both bright and dark areas compared to standard dynamic range (SDR). One of its key advantages is its backward compatibility with SDR displays, achieved without the need for additional metadata. This makes HLG particularly valuable for applications like live broadcasting, where the content needs to be compatible with both HDR and SDR displays. When using an HLG picture profile on a Sony camera, you're able to capture video that can be displayed with enhanced dynamic range on HDR-compatible screens, while also retaining reasonable quality on standard screens.