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by JyrkiAlakuijala
1048 days ago
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JPEG XL has 10 8x8 transforms and 9 larger transforms (IIRC). Two of the 8x8 transforms are extremely local. One is called IDENTITY and the other DCT2x2. It is very difficult to produce ringing artefacts when using these transforms. When going to higher quality settings in libjxl, it tends to favor the DCT2x2 quite a bit. This is in VarDCT -- not modular coding. |
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