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OpenJPH as an open-source implementation of high-throughput JPEG2000 Part-15 (or JPH or HTJ2K) is now significantly faster for both encode and decode operations thanks to new AVX2 optimizations for Intel and AMD processors…
Полный текст и контекст у первоисточника: https://www.phoronix.com/news/OpenJPH-0.28-Released