There's a ton of stuff like this in all the plugins:

from PIL import Image, ImageFile, ImagePalette, _binary

The ones shipped with PIL should be using relative imports instead.

This would also be a good occasion to replace all this kind of nonsense:

from PIL import Image, ImageFile, ImagePalette, _binary
i8 = _binary.i8
i16 = _binary.i16le
i32 = _binary.i32le
o8 = _binary.o8
o16 = _binary.o16le
o32 = _binary.o32le

With this:

from ._binary import i8, i16, i32, o8, o16, o32