{% thumbnail photo.image 300x170 %}我使用easy_thumbnails，它在开发机器上运行良好，但在生产中，当我使用templatetag时，我得到如下所示的错误。
虽然可以直接浏览http: //sitename.com/media/uploads/2012/09/13/ microsoft1.jpeg`。媒体设置正确并且上传被放置在正确的位置，缺少什么然后可能是什么问题？
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
模型
ThumbnailerImageField从easy_thumbnails被使用
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)
更新
我从 Django 的管理外壳进行了调查，并且get_thumbnailer功能正常
>>> 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'
当我调用 get thumbnail 方法时它失败了
>>> 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