JPEG Tutorial (by Ray Wolfgang). Top PageWelcome to the JPEG Tutorial! This page presents a brief description of how JPEG compresses images. JPEG, unlike other formats like PPM, PGM, and GIF, is a lossy compression technique; this means visual information is lost permanently. The key to making JPEG work is choosing what data to throw away. Introduction JPEG is the image compression standard developed by the Joint Photographic Experts Gr
