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The trick consists, obviously, in opening a jpg file as binary stream (easy, fopen), changing the appropriate info in the binary stream (made of headers, pixels, god knows how they're organised - got to check the specs), <-- that's the hard part and sending that file somewhere else. We should perhaps serialize the stream, then we can redirect it to another script, or a file, whatever we need. Since this seems a good occasion to learn something about jpg, should I only implement a resize method? I can add some desaturate, or some writeText method, not additional TTF, don't have the time.
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