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Pretty sure you can rotate JPEG images lossless. But it’s still simpler to just modify metadata.
by dividuum 1y ago
Pretty sure you can rotate JPEG images lossless. But it’s still simpler to just modify metadata.
- perching_aix 1y agoA quick search suggests to me that it's only a lossless process if the image dimensions are a clean integer multiple of 8 or 16 (as the blocks can be 8x8, 8x16, 16x8, or 16x16), otherwise the edges must be reencoded. Never written a JPEG codec though, so happy to be proven wrong.
- addaon 1y agoThis is true, and others have mentioned it, but I think people are underestimating just how universal sensor dimensions being a multiple of 16 is — I really can’t think of any exceptions.