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())

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

For example what I am doing:

               UploadedFile    =>   data = StringIO(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"

[Malcolm Tredinnick]

Fixed ticket description formatting.