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by Steuard
4904 days ago
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Because JPEG files don't store a value for every pixel in the image: the information is encoded very differently. By good fortune, lossless 90 and 180 degree rotations are possible for the JPEG format, but only for certain image dimensions (multiples of 8 or maybe 16, as I understand it). Some notes on what is possible can be found at http://jpegclub.org/ . |
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