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01 ·Image Codecs·FREE·8 min read Why PNG Does Not Degrade — Prediction Filters and Deflate What it means to shrink a file without changing a single bit. Starting from why no compressor can shrink everything, then PNG's five row filters as prediction-and-residual, Deflate (LZ77 plus Huffman), and why photographs resist it while screenshots collapse. Ending with a decision procedure for choosing between PNG and JPEG.