ansaurus

Question

Getting invalid image error in Django, but PIL is installed and passes all tests

Answer 1

A:

My impression of the PIL JPEG problem is that it's almost always a system configuration problem.

You built and configured PIL and tested with that version and it worked. So, my guess is that Django is pulling in a different PIL, probably one built without JPEG support or that can't find libjpeg.

You can confirm this by running your test again but using python -v manage.py shell instead of running python2.6 directly. You need to be careful here though and make sure your python executable and PYTHONPATH exactly match what is loaded by your web server.

Van Gale 2010-01-21 17:12:49

Since this is a RHEL system I can't really use python directly since it's an older version. I'm using mod_wsgi and I believe it's running python 2.6 anyway (otherwise, pretty sure nothing in Django would run!)Is there any way to output which version of PIL is being used on the webpage itself?

Jordan Reiter 2010-01-21 18:14:23

Nevermind, looks like python now correctly points to python2.6 anyway.I'll put the output for that up as well.

Jordan Reiter 2010-01-21 18:16:56

Okay, after looking over your answer again I realize what you were saying -- you meant to see what came up when calling the Django manage.py shell. I did that, looks like verify works fine as well. Very strange; looks like it *only* happens during a web request.

Jordan Reiter 2010-01-21 18:22:43

Running manage.py from your login shell can still operate differently from web requests because it's still inheriting from your interactive shell environment. You need to make sure your the python exe and PYTHONPATH are the same in your mod_wsgi environment. Getting PIL version # isn't enough either because system PIL could be same version but built without JPEG support.

Van Gale 2010-01-21 20:40:48

Is there a way to output all of this directly on the page, or a way to run the Image.verify() with debug output somehow?

Jordan Reiter 2010-01-22 20:07:07

See edit on answer

Van Gale 2010-01-22 21:19:39

Okay, python paths are now identical (although modules loaded are not -- but no difference in PIL modules). Still getting the error! Very frustrating.

Jordan Reiter 2010-01-27 05:28:57

Answer 2

+2 A:

See possible answer in:

http://stackoverflow.com/questions/2173103/is-it-possible-to-control-which-libraries-apache-uses

Referencing here so can still get bounty if awarded. :-)

Graham Dumpleton 2010-02-02 23:22:18

So noted. See my comments in the other post, thanks.

Jordan Reiter 2010-02-02 23:58:01

Woah. Looks like you are about to win the giant kielbasa. Disabling PHP did the trick. Now I just need to figure out how to get fastcgi installed on RHEL and I'm good to go.

Jordan Reiter 2010-02-03 14:59:52

A WINNER IS YOU.

Jordan Reiter 2010-02-03 16:18:47

ansaurus

tags:

views:

answers:

Getting invalid image error in Django, but PIL is installed and passes all tests

related questions