[Image-SIG] Image.open doesn't close file before raising IOError "cannot identify image file"

[aut imagesig]

Hello,

If Image.open raises an IOError ("cannot identify image file"), it doesn't close the file.

For my own use I've added

fp.close( )

just before the error is thrown (Line 1507). Don't know if that's the best way, or if there might be any unforseen consequence. Seems to fix my specific problem; I am trying to delete the image immediately if it isn't identified:

try:
     im = Image.open(filename)
except IOError:
     os.remove(filename)

Everything else works great!

Thanks,

aut