Explores how image data transforms from raw pixels to compressed files through encoding and decoding processes. Covers pixel fundamentals, image formats like JPEG, AVIF, and WebP, and compression techniques including chroma subsampling, spatial locality exploitation, prediction modes, DCT transformations, quantization, and entropy coding. Demonstrates practical JavaScript examples for pixel manipulation and explains how modern codecs achieve significant file size reductions while maintaining visual quality through various optimization strategies.
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