What versions of Pillow and Python are you using? Python v3.4.4 (x64) on Windows 7 Pillow 4.2.1 What have you tried? I have tried enclosing img.save () in a context manager, as well as explicitly ...

Do you think there should be a method at all to close the file pointer that Pillow has been passed? As documentation of some libraries say, "it is the caller's responsibility to close the file object" ...