Webfaction Django 1.4.1：easy_thumbnails 3.0b - “无法获取缩略图”错误

问题描述

我使用easy_thumbnails，它在开发机器上工作正常，但在生产中，我收到错误，如下所示，当我使用 {％thumbnail photo.image 300x170％} templatetag 。

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.

虽然可以直接浏览`。
还有媒体设置正确，上传被放置在正确的地方，那么错误的是什么？

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

模型

ThumbnailerImageField from easy_thumbnails 使用

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)





更新

我从Django的管理外壳中调查过， 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

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

推荐答案

问题是因为默认情况下 pip install PIL 与 libjpeg 链接，所以 pip install PIllow ，并在

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

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