关注Django照片应用教程时解码器JPEG不可用错误

I am following a Django tutorial that involves image uploading, and have run into this problem. I tried installing and reinstalling PIL, libjpeg, and libfreetype6 several times, but nothing so far seems to be working. I have spent several hours trying to find a solution, and am very frustrated at this point. Please help.

我正在关注涉及图像上传的Django教程，并遇到了这个问题。我尝试了多次安装和重新安装PIL，libjpeg和libfreetype6，但到目前为止似乎没有任何工作。我花了几个小时试图找到解决方案，在这一点上非常沮丧。请帮忙。

Here is the result of selftest.py after I reinstall PIL on my mac:

这是我在我的mac上重新安装PIL后selftest.py的结果：

PIL 1.1.6 BUILD SUMMARY
--------------------------------------------------------------------
version       1.1.6
platform      darwin 2.7.3 (v2.7.3:70274d53c1dd, Apr  9 2012, 20:52:43)
              [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]
--------------------------------------------------------------------
--- TKINTER support ok
*** JPEG support not available
--- ZLIB (PNG/ZIP) support ok
*** FREETYPE2 support not available
--------------------------------------------------------------------
To add a missing option, make sure you have the required
library, and set the corresponding ROOT variable in the
setup.py script.

To check the build, run the selftest.py script.
rrdhcp-10-32-44-157:Imaging-1.1.6 pfg$ python selftest.py
*****************************************************************
Failure in example: _info(Image.open("Images/lena.jpg"))
from line #24 of selftest.testimage
Exception raised:
Traceback (most recent call last):
  File "./doctest.py", line 499, in _run_examples_inner
    exec compile(source, "<string>", "single") in globs
  File "<string>", line 1, in <module>
  File "./selftest.py", line 22, in _info
    im.load()
  File "PIL/ImageFile.py", line 180, in load
    d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
  File "PIL/Image.py", line 375, in _getdecoder
    raise IOError("decoder %s not available" % decoder_name)
IOError: decoder jpeg not available
1 items had failures:
   1 of  57 in selftest.testimage
***Test Failed*** 1 failures.
*** 1 tests of 57 failed.

4 个解决方案

#1

There are several cases with PIL which lead to a similar experience. If you have installed PIL out of a virtualenv using

PIL有几种情况可以带来类似的体验。如果您使用了virtualenv安装了PIL

pip install PIL

Then you should have installed the dev versions of libjpeg, libz before. Assuming you're on a Ubuntu box, a

那你应该先安装libjpeg，libz的开发版本。假设你在Ubuntu盒子上，一个

pip uninstall PIL
apt-get install libjpeg-dev zlib1g-dev libpng12-dev
pip install PIL

should suffice. You could also install Pillow instead of PIL, it works better with setuptools and can be installed in a virtualenv.

应该足够了。您也可以安装Pillow而不是PIL，它可以更好地使用setuptools，并且可以安装在virtualenv中。

#2

I found this worked fine for me:

我发现这对我来说很好：

pip uninstall PIL
pip install Pillow

then I restarted the server:

然后我重新启动了服务器：

kill -HUP XXX

where XXX is the process ID of the your server process.

其中XXX是您的服务器进程的进程ID。

#3

I was already using Pillow and got the same error. Tried installing libjpeg or libjpeg-dev as suggested by others but was told that a (newer) version was already installed.

我已经在使用Pillow并得到了同样的错误。尝试按照其他人的建议安装libjpeg或libjpeg-dev，但被告知已经安装了（较新的）版本。

In the end all it took was reinstalling Pillow:

最后所需要的只是重新安装枕头：

sudo pip uninstall Pillow
sudo pip install Pillow

#4

In case you are using Fedora, please do, before doing a pip install Pillow:

如果你正在使用Fedora，请在做pip安装Pillow之前做：

yum install libjpeg-devel zlib1g-devel libpng12-devel

#1