Convert AVIF to BMP

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.

The BMP (Bitmap) format, formally known as the Device Independent Bitmap (DIB) file format, is a raster graphics standard developed by Microsoft for the Windows operating system. The file structure consists of a file header (BITMAPFILEHEADER), an information header (typically BITMAPINFOHEADER), a color table, and the pixel array. Data is stored as a grid of pixels with color depths ranging from 1-bit to 32-bit, typically uncompressed, though the format supports lossless Run-Length Encoding (RLE4 or RLE8) and Huffman 1D compression for specific bit depths.

Due to its simplicity and documentation as a core Windows standard, BMP files possess near-universal compatibility. They can be opened natively by virtually all image viewers and web browsers across Windows, macOS, and Linux without additional software. Standard utilities include Microsoft Paint, Apple Preview, and Windows Photos. For advanced manipulation, pixel-based editors like Adobe Photoshop and CorelDRAW are recommended, though the format is rarely used for complex editing due to its large file size.