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RE: Steganography - Hide important documents in images
Depends on the operation there are certain tools to examine the information that is appended to the image and remove it so it can't be tracked
Also i think compressing the image to optimize website performance like instagram does might destroy the data altough i never tried but that was a great question and i will have to try to see what happens.
Image editing probably if you use paint won't make a change some other more complex programs might....