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What are houses made out of, AND trees?
The 'Jerry Springer Nudity De-Mosaic'
Image Stack Fun (Photoshop Extended)
and for a more practical application...
High ISO Noise Reduction by Image Averaging
Lets say you are in a museum: no flash allowed, no tripods allowed, but photos are allowed.
You can take a bunch at high ISO and average them together to get rid of the noise.
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