ok, I solved it, I had to add an "import" of the Image class, so the changes to produce Antialiased cover pictures are:
change line:
import optparse, sys, os, shutil, xml.dom.minidom, ImageOps, datetime, configobj
to:
import optparse, sys, os, shutil, xml.dom.minidom, ImageOps, datetime, configobj, Image
and:
cover.thumbnail(coversize)
to:
cover.thumbnail(coversize, Image.ANTIALIAS)
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