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by usr1106 1990 days ago
> At the very least, it should mention if the optimization is lossless [...] or lossy

True, the UI is optimized a bit too much :)

By looking very carefully at some test image I see that it is not lossless, there are more compression artifacts. Well, lossless would have been a miracle, it reduced the size of my photo from nearly 600 KB to just a bit over 180 KB.