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"How to Use AVIF: The New Next-Gen Image Compression Format", Dan Klammer (@danklammer)

… ~50% savings compared to JPEG, and ~20% savings compared to WebP.
… can be lossy or lossless, has the ability to use an alpha channel (transparency for UI and design elements), and even has the ability to store a series of animated frames (think lightweight high-quality animated GIFs).
… one of the first image formats to support HDR color support; offering higher brightness, color bit depth, and color gamuts.