I don't know if it's just me, but I can't tell any difference between the image I uploaded and yours. Going by the example on that PHP page, when using "80", the image quality retention should be (assuming it's universal) more or less transparent while shaving off 60-65% of the filesize. For some reason though, the thumbnails for both of our Kanno pics have retained only about 10% of the original size, with next to no difference between the two of them.
I don't know, it's weird.
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