IOError: cannot write mode RGBA as JPEG

[chrismytton]

Internal Server Error: /search/autocomplete/
Traceback (most recent call last):
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/data/vhost/mzalendo.mysociety.org/pombola/pombola/search/views.py", line 469, in autocomplete
    image_url = get_thumbnail(image, '16x16', crop="center").url
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/shortcuts.py", line 8, in get_thumbnail
    return default.backend.get_thumbnail(file_, geometry_string, **options)
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/base.py", line 125, in get_thumbnail
    thumbnail)
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/base.py", line 158, in _create_thumbnail
    default.engine.write(image, options, thumbnail)
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/engines/base.py", line 139, in write
    progressive=progressive
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/engines/pil_engine.py", line 228, in _get_raw_data
    image.save(bf, **params)
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/PIL/Image.py", line 2007, in save
    save_handler(self, fp, filename)
  File "/data/vhost/mzalendo.mysociety.org/pombola-virtualenv/lib/python2.7/site-packages/PIL/JpegImagePlugin.py", line 622, in _save
    raise IOError("cannot write mode %s as JPEG" % im.mode)
IOError: cannot write mode RGBA as JPEG

https://groups.google.com/a/mysociety.org/d/msg/cron-mzalendo/JhgdoVv3G2M/hh3oBWD_AAAJ

[chrismytton]

Looks like this is due to a change in Pillow: python-pillow/Pillow#2609

[chrismytton]

The original stacktrace is from Mzalendo, but it's happening on PA as well, with a different stacktrace.

Internal Server Error: / 
Traceback (most recent call last): 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/core/handlers/base.py", line 164, in get_response 
    response = response.render() 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/response.py", line 158, in render 
    self.content = self.rendered_content 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/response.py", line 135, in rendered_content 
    content = template.render(context, self._request) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/backends/django.py", line 74, in render 
    return self.template.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 210, in render 
    return self._render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 202, in _render 
    return self.nodelist.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render 
    bit = self.render_node(node, context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node 
    return node.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 135, in render 
    return compiled_parent._render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 202, in _render 
    return self.nodelist.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render 
    bit = self.render_node(node, context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node 
    return node.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 135, in render 
    return compiled_parent._render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 202, in _render 
    return self.nodelist.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render 
    bit = self.render_node(node, context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node 
    return node.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 65, in render 
    result = block.nodelist.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render 
    bit = self.render_node(node, context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node 
    return node.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 65, in render 
    result = block.nodelist.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render 
    bit = self.render_node(node, context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node 
    return node.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/defaulttags.py", line 329, in render 
    return nodelist.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render 
    bit = self.render_node(node, context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node 
    return node.render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/templatetags/thumbnail.py", line 59, in render 
    return self._render(context) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/templatetags/thumbnail.py", line 137, in _render 
    thumbnail = get_thumbnail(file_, geometry, **options) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/shortcuts.py", line 8, in get_thumbnail 
    return default.backend.get_thumbnail(file_, geometry_string, **options) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/base.py", line 125, in get_thumbnail 
    thumbnail) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/base.py", line 158, in _create_thumbnail 
    default.engine.write(image, options, thumbnail) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/engines/base.py", line 139, in write 
    progressive=progressive 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/sorl/thumbnail/engines/pil_engine.py", line 228, in _get_raw_data 
    image.save(bf, **params) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/PIL/Image.py", line 2007, in save 
    save_handler(self, fp, filename) 
  File "/data/vhost/www.pa.org.za/pombola-virtualenv/lib/python2.7/site-packages/PIL/JpegImagePlugin.py", line 622, in _save 
    raise IOError("cannot write mode %s as JPEG" % im.mode) 
IOError: cannot write mode RGBA as JPEG

https://groups.google.com/a/mysociety.org/d/msg/cron-pa/07I2kV28bIc/Is5G_zcWAgAJ

[chrismytton]

Guessing this might have been caused by the Pillow upgrade in #2584.

[chrismytton]

Searching for "George Magoha" on Mzalendo seems to trigger this error.

http://info.mzalendo.com/search/?q=George+Magoha&section=persons&order=relevance

[chrismytton]

This error was causing the homepage of pa.org.za to return a 500 error. My temporary workaround was to simply downgrade Pillow: 9bcc0a3

[chrismytton]

Looks like this was fixed in sorl-thumbnail 12.4.1. The latest version is 12.5, but that doesn't have support for Django 1.8, so let's give 12.4.1 a try for now.