Convert Radiance HDR to AVIF

An HDR file (Radiance RGBE, .hdr or .pic) stores high dynamic range images using 32-bit floating-point-like color values, so it can record light far brighter and darker than a normal photo. It was created by Greg Ward in 1985 for the Radiance lighting simulation software and uses a simple run-length encoded format with a shared exponent per pixel.

HDR files are widely used in 3D rendering and visual effects as environment maps (HDRIs) that light a scene realistically.

Photoshop, GIMP, Affinity Photo, Blender, Krita and HDR viewers such as HDRView open .hdr files. Standard photo viewers usually can't, and screens can't show the full range, so convert HDR to JPG or PNG to get a regular image you can view and share.

The AVIF (AV1 Image File Format) is an open, royalty-free raster image container specified by the Alliance for Open Media (AOMedia) in ISO/IEC 23000-12. It encapsulates image sequences or still images compressed with the AV1 video codec within the HEIF (High Efficiency Image File Format) container structure. AVIF supports high dynamic range (HDR) utilizing Perceptual Quantizer (PQ) or Hybrid Log-Gamma (HLG) transfer functions, wide color gamut (WCG), and 4:2:0, 4:2:2, or 4:4:4 chroma subsampling, offering superior compression efficiency over JPEG and WebP.

Native support for AVIF is available in modern web browsers including Google Chrome (v85+), Mozilla Firefox (v93+), and Safari (v16+). For local viewing, Windows 10 and 11 require the installation of the free 'AV1 Video Extension' from the Microsoft Store to enable support in the Photos app and File Explorer. macOS 13 (Ventura) and iOS 16 provide system-level support. Graphics editors like GIMP, Paint.NET, and Adobe Photoshop (via plugin) can also decode and edit these files.