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Found a great page on lossy vs lossless compression, testing the user to see if you can tell the difference. Try the test and let me know how you did.
I got 7 out of 10.
Not very safe for browsing around one's wife, either!
I started badly but quickly reaslised that it's easy to spot a JPEG if there is gradual colour JPEGs look more blotchy. So the ones with the grey backgrounds turned out to be dead easy, those with solid backs were much harder to discriminate.
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