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  1. or download this
    $ gs -q -dBATCH -dNOPAUSE -sDEVICE=jpeg -dJPEGQ88 -r150 -sOutputFile=i
+mg%d.jpg input.pdf
  2. or download this
    $ gs -q -dBATCH -dNOPAUSE -sDEVICE=jpeg -dJPEGQ88 -r600 -sOutputFile=i
+mg%d.jpg input.pdf
$ for img in img*.jpg ; do convert $img -filter Lanczos -resize 25% -q
+uality 90 out_$img ; done