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One of my coworkers uploaded all his high resolutions photos to some site (probably Yahoo!Photos ???) and lost the local copy. He was surprised that the site only stored the photos at a lower resolution than the original files.



Heh. Almost like having old style photos, you stored the negatives in grandma's garage, but they got wet and now have mold on them.

You can still make out who's who in them. Sorta.


In a normal photo, after a resolution change and a lossy compression, you still have the photo.

If you encode some binary data in a fake photo, after a resolution change and a lossy compression, you will only get garbage.


It depends on the encoding. If it's sufficiently low frequency and includes error correction, then your data could survive. You won't get very good efficiency though!




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