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If you've worked with JPEG images before you may know that repeated opening and saving can introduce “compression artifacts”. I've known this for years, but I did not expect this outcome of saving the same picture 500 times. I expected the whole photo to turn into a mess pretty quickly. Watch to see what happened.
I took the original JPEG photo and opened it in Photoshop. Then I saved over itself as quality level 10 (out of 12). Then I closed the file and reopened it and did it again, 500 times. Each time I saved a copy and numbered them. Then I took every third picture and made this short movie out of them. If I used all 500, the movie would have dragged on too long, and the slow changes would be even harder to notice. |
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High Quality JPEG Recompression Artifacts – 500 saves
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