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echinopsis posted:ok so each jpeg file now has to have a set of coordinates that are relative to the image to determine how the image should be shown as a thumbnail JFIF supports embedded thumbnails already, WONT FIX. Absolutely gently caress all software seems to support thumbnails, so  echinopsis posted:can you rotate a jpeg safely In 90° increments, yes.
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Jul 19, 2023 20:03
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echinopsis posted:i presume you decide it to some bit planes, do a few nested for loops and move the pixels around, and re-encode You rebuild the AC coefficients in each DCT block whilst keeping the same DC. So basically decoding a couple of layers but not the entire image. Or, just use one of the bajillion apps and libraries that implement it already: http://jpegclub.org/losslessapps.html There's a lot of interesting stuff that can be done in the frequency domain without a full decode, https://arxiv.org/ftp/arxiv/papers/1907/1907.11503.pdf
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Jul 22, 2023 00:11
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