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Originally Posted by SCHNEE-4
How can you tell if a picture has jpeg artifacts?
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It's easy. You will notice the image being broken up into various visible "squares". This is because what JPEG compression does is actually break an image up into several tiny implicit patterns, which takes up less space. The higher the compression, the simpler the patterns that are used. When the patterns are too simple to fairly represent the way all or part of the image should look, it's referred to as "JPEG artifacts".
See here for more info:
http://en.wikipedia.org/wiki/JPEG
Jam it back in, in the dark.
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