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Often it's possible to detect invalid markers or Huffman decompression errors. If bottom part is grey though, it's most likely invalid marker inside JPEG image data. JPEGSnoop will tell exact byte, edit offending FF xx marker using HxD for example, and rest of image will decode (unless corruption is more extensive). In below example I edit one byte only (FF ...


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As couple of years ago, I asked a former colleague, who is now working at Facebook on Artificial Intelligence, whether they used internally something else than JPEG. And the answer was: "no". However, here are a couple of additional sources to investigate the issue, including questions on Facebook processing/enhancing images: Spectrum, a cross-...


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If you have access to the bitstream, you should be able to figure out which codec they are using. Assuming that it is good old jpeg, possibly with a tweaked encoder implementation, I would parse the stream using JPEGSnoop to learn as much as possible. It can even try to match «known» encoders: https://www.impulseadventure.com/photo/jpeg-snoop.html If you can ...


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