I don't have any Windows machines at my disposal, so I can't really help you if it's a factor. I do suspect your installed version is broken though, so I'd suggest installing a newer version first, to see if that fixes it.

You can find version 6.3.3 on the ImageMagick website.

In reply to Re^5: permagick jpg compression by rhesa
in thread permagick jpg compression by Anonymous Monk

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