How to create two thumbnails with django?

Question

I want to create two thumbnails (a small one and a medium one)

This is my code (using python2.7+django1.3):

import Image
...
def thumbnail(f,file_name,path):
    small = 35,35
    small_file_name = path+'/small_'+file_name
    medium = 310,235
    medium_file_name = path+'/medium_'+file_name

    small_im = Image.open(f)
    small_im.thumbnail(small)
    small_im.save(small_file_name)

    medium_im = Image.open(f)
    medium_im.thumbnail(medium)
    medium_im.save(medium_file_name)

I am getting this error:

IOError at /upload/
cannot identify image file

f is image FILES post from another page, f = request.FILES['photo']

Some errors in last three lines, I have to comment last three lines,it's not a error, but this is not what I want.

If I run the code in the python shell it doesn't raise errors:

>>> from users.upload import thumbnail
>>> import Image
>>> f = '/home/david/1.jpg'
>>> file_name = 'test.jpg'
>>> path = '/home/david'
>>> thumbnail(f,file_name,path)

I don't understand why I'm getting an error.

Answer 1

You can try doing this:

def thumbnail(f,file_name,path):
 img = Image.open(f)
 small = 35,35
 small_file_name = path+'/small_'+file_name
 medium = 310,235
 medium_file_name = path+'/medium_'+file_name

 img.thumbnail(medium)
 img.save(medium_file_name)

 img.thumbnail(small)
 img.save(small_file_name)

Answer 2

You are having a problem because f = request.FILES['photo'] is not a file path, as you assume it is. Instead it is a Django UploadedFile . You should write this file to the disk somewhere before passing its path to PIL Image.open() .

You could also try passing the temporary_file_path .