Loading image from Flask's request.files attribute into PIL Image

Question

image = Image.open(request.files["fullimage"])

returns:

IOError: cannot identify image file

and

image = Image.open(request.files["fullimage"].read())

returns:

IOError: [Errno 22] invalid mode ('rb') or filename: ''

What's the right way to do this, please?

where is the file located ? how large is it ? When you upload the file, what exact text do you see in the form ? Can you share the view code please? — codegeek, Jul 18 '13 at 20:42

score 15 · Answer 1 · answered Dec 13 '16 at 03:01

15

This could work.

img = Image.open(request.files['file'].stream)

Maybe it's too late, but hope it would help others who find this.

answered Dec 13 '16 at 03:01

Chen Zhu

161
1
5

score 0 · Answer 2 · answered Jul 18 '13 at 21:17

0

I knew this would happen: in trying to put together a simple testcase, I have found the problem and fixed it. It was failing because before the line that tries to load it into the Image, I was doing other stuff, including:

request.files["fullimage"].read()

Without that, it worked fine. Adding:

request.files["fullimage"].seek(0)

between that and the line that loads it into the Image fixed the problem. I mean, I have another problem now, but I'll post that separately ;-)

answered Jul 18 '13 at 21:17

matthewk

1,771
15
30

2

You can read a "file" from `request.files` only **once**. It is a stream, so when you read it, you will empty it. `seek(0)` won't help you. – dAnjou Jul 18 '13 at 21:19
That is probably the cause of my next problem, then! Can I take a copy? – matthewk Jul 18 '13 at 21:21
You can save it to a temporary file: http://docs.python.org/2/library/tempfile.html - create such a file object and pass it to `save()`. – dAnjou Jul 18 '13 at 22:02
Is that the only way? Can't I create an in-memory copy? – matthewk Jul 18 '13 at 22:37
2

@matthewk: Sure, write it into a `StringIO`/`cStringIO` object. – Blender Jul 18 '13 at 23:16
And then can I read the data from the StringIO object more than once? – matthewk Jul 19 '13 at 14:15

Loading image from Flask's request.files attribute into PIL Image

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