Python crash when downloading image as numpy array

Question

Why does the following code crash python? Is there an easier/better way to download an image and convert it to a numpy array?

from pylab import *
from urllib import request
captcha=imread(request.urlopen('http://pastebin.com/etc/CaptchaSecurityImages.php?width=100&height=35&characters=4&b=123'))

Note that this causes the python interpreter to exit rather than just printing a stack trace.

It doesn't crash: NameError: name 'imread' is not defined. — Bakuriu
– Bakuriu, Commented Mar 3, 2013 at 6:52

cgohlke · Accepted Answer · 2013-03-03 08:16:17Z

7

Several issues:

imread can not detect the image type and defaults to png.
matplotlib's _png.read_png crashes on Python 3 with urllib.request object.
the request.urlopen object is missing a seek function and does not work with PIL (PIL is used by matplotlib to read non-png images).

This code works for me on win-amd64-py3.3:

from pylab import *
from urllib import request
from io import BytesIO
url = 'http://pastebin.com/etc/CaptchaSecurityImages.php?width=100&height=35&characters=4&b=123'
data = BytesIO(request.urlopen(url).read())
captcha = imread(data, format='jpg')

answered Mar 3, 2013 at 8:16

cgohlke

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