Question

I use easy_thumbnails and it works fine on a development machine but in production I get errors like shown below, when I use {% thumbnail photo.image 300x170 %} templatetag.

Though can directly browse http://sitename.com/media/uploads/2012/09/13/microsoft1.jpeg`.
Also media set correctly and uploads are being placed at the right place, what is missing then what might be wrong?

File "/home/imanhodjaev/lib/python2.7/django/template/base.py" in render
  823. bit = self.render_node(node, context)
File "/home/imanhodjaev/lib/python2.7/django/template/debug.py" in render_node
  74. return node.render(context)
File "/home/imanhodjaev/lib/python2.7/easy_thumbnails/templatetags/thumbnail.py" in render
  99. (source, e))
Exception Type: TemplateSyntaxError at /petition/microsoft-myi-hotim-kyirgyizskij-rasklad-klaviatur/update-picture
Exception Value: Couldn't get the thumbnail uploads/2012/09/13/microsoft1.jpeg: The source file does not appear to be an image

Model

ThumbnailerImageField from easy_thumbnails is used

class Petition(models.Model):
    title = models.CharField(max_length=512)
    slug = models.SlugField(max_length=512, editable=False, blank=True)
    description = models.TextField()
    petition_text = models.TextField(blank=True, null=True)
    petition_picture = ThumbnailerImageField(upload_to=get_upload_path, blank=True)

Update

I did investigation from Django’s management shell and get_thumbnailer function works fine

>>> thumb_url = get_thumbnailer(pet.petition_picture)
>>> thumb_url
<ThumbnailerImageFieldFile: uploads/2012/09/13/microsoft1.jpeg>
>>> thumb_url.url
'/m/uploads/2012/09/13/microsoft1.jpeg'

And when I call get thumbnail method it fails

>>> thumb_url = get_thumbnailer(pet.petition_picture).get_thumbnail(options)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/home/imanhodjaev/lib/python2.7/easy_thumbnails/files.py", line 380, in get_thumbnail
    thumbnail = self.generate_thumbnail(thumbnail_options)
  File "/home/imanhodjaev/lib/python2.7/easy_thumbnails/files.py", line 290, in generate_thumbnail
    "The source file does not appear to be an image")
InvalidImageFormatError: The source file does not appear to be an image

Answer 1

The problem was because of by default pip install PIL on my Webfaction instance was linked with libjpeg so did pip install PIllow and followed the article at http://community.webfaction.com/questions/7340/how-to-install-pil-with-truetype-support