UploadedFile does not work correctly with forms.ImageField (newforms)

[tek]

I tried all the same with "forms.Field" - works well. But there is a problem if I try to use "forms.ImageField", it can't work correctly with the UploadedFile
This can be seen if you try to process the downloaded pictures using lib PIL.Image .

forms.py
It's not work:

class UploadFileForm(forms.Form):
    img = forms.ImageField(widget=forms.FileInput())  # or simple forms.ImageField()

It's work fine:

class UploadFileForm(forms.Form):
    img = forms.Field(widget=forms.FileInput())

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I think it's bug, new version UploadedFile do not work as well as older.

For example what I am doing:

UploadedFile => data = StrinIO(UploadedFile.read()) => Image.open(data)

And what I got:

IOError at /upload_image/
cannot identify image file

It's work only if I use "forms.Field"