Observed arrival · 2026-11-14
zjpeg: JPEG recompression at the coefficient level
A browser-accessible codec recompresses JPEGs by coding their quantized DCT coefficients instead of re-encoding image pixels.
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- JPEG archivists and image-pipeline developers
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- Its profiles trade compression ratio for speed; ZJP3 Fast2 is presented as an experimental middle ground.
Field notes
The described pipeline parses JPEG structure, decodes the entropy-coded stream to quantized coefficients, and stores those coefficients with a banded range coder. On restoration, it generates fresh Huffman tables, so the output file need not match the input byte-for-byte even though the project says decoded pixels do. The page also describes a C++ library with a stable C ABI and a WebAssembly build; its Fast2 profile is marked experimental.
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