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this post was submitted on 20 Oct 2025
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Privacy
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That's the obvious one. But you can also add data to images by adding tiny values to the pixels, it'll still look the same to us (same as printer tiny dots).
I don't know if phones actually do this. Just saying it's possible.
But many uploading sites optimize the images, so it'll be gone on reshare, but they could get it on first upload.
That's steganography.