[Python] Downloading image with PIL and requests

I am trying to download an original image (png format) by url, convert it on the fly (without saving to disc) and save as jpg.

The code is following:

import os
import io
import requests
from PIL import Image
...
r = requests.get(img_url, stream=True)
if r.status_code == 200:
i = Image.open(io.BytesIO(r.content))
i.save(os.path.join(out_dir, 'image.jpg'), quality=85)


It works, but when I try to monitor the download progress (for the future progress bar) with r.iter_content() like this:

r = requests.get(img_url, stream=True)
if r.status_code == 200:
for chunk in r.iter_content():
print(len(chunk))
i = Image.open(io.BytesIO(r.content))
i.save(os.path.join(out_dir, 'image.jpg'), quality=85)


I get this error:

Traceback (most recent call last):
File "E:/GitHub/geoportal/quicklookScrape/temp.py", line 37, in <module>
i = Image.open(io.BytesIO(r.content))
File "C:\Python35\lib\site-packages\requests\models.py", line 736, in content
'The content for this response was already consumed')
RuntimeError: The content for this response was already consumed


So is it possible to monitor the download progress and after get the data itself?

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