Python图像库失败，并显示消息“解码器JPEG不可用”-PIL

PIL does support JPEG in my system.

Whenever I do an upload, my code is failing with:

File "PIL/Image.py", line 375, in _getdecoder
    raise IOError("decoder %s not available" % decoder_name)
IOError: decoder jpeg not available

How can I resolve this?

libjpeg-dev is required to be able to process jpegs with pillow (or PIL), so you need to install it and then recompile pillow. It also seems that libjpeg8-dev is needed on Ubuntu 14.04

If you’re still using PIL then you should really be using pillow these days though, so first pip uninstall PIL before following these instructions to switch, or if you have a good reason for sticking with PIL then replace “pillow” with “PIL” in the below).

On Ubuntu:

# install libjpeg-dev with apt
sudo apt-get install libjpeg-dev
# if you're on Ubuntu 14.04, also install this
sudo apt-get install libjpeg8-dev

# reinstall pillow
pip install --no-cache-dir -I pillow

If that doesn’t work, try one of the below, depending on whether you are on 64bit or 32bit Ubuntu.

For Ubuntu x64:

sudo ln -s /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib
sudo ln -s /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib
sudo ln -s /usr/lib/x86_64-linux-gnu/libz.so /usr/lib

Or for Ubuntu 32bit:

sudo ln -s /usr/lib/i386-linux-gnu/libjpeg.so /usr/lib/
sudo ln -s /usr/lib/i386-linux-gnu/libfreetype.so.6 /usr/lib/
sudo ln -s /usr/lib/i386-linux-gnu/libz.so /usr/lib/

Then reinstall pillow:

pip install --no-cache-dir -I pillow

(Edits to include feedback from comments. Thanks Charles Offenbacher for pointing out this differs for 32bit, and t-mart for suggesting use of --no-cache-dir).

For those on OSX, I used the following binary to get libpng and libjpeg installed systemwide:

libpng & libjpeg for OSX

Because I already had PIL installed (via pip on a virtualenv), I ran:

pip uninstall PIL
pip install PIL --upgrade

This resolved the decoder JPEG not available error for me.

UPDATE (4/24/14):

Newer versions of pip require additional flags to download libraries (including PIL) from external sources. Try the following:

pip install PIL --allow-external PIL --allow-unverified PIL

See the following answer for additional info: pip install PIL dont install into virtualenv

UPDATE 2:

If on OSX Mavericks, you’ll want to set the ARCHFLAGS flag as @RicardoGonzales comments below:

ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install PIL --allow-external PIL --allow-unverified PIL

This is the only way that worked for me. Installing packages and reinstalling PIL didn’t work.

On ubuntu, install the required package:

sudo apt-get install libjpeg-dev

(you may also want to install libfreetype6 libfreetype6-dev zlib1g-dev to enable other decoders).

Then replace PIL with pillow:

pip uninstall PIL
pip install pillow

The followed works on ubuntu 12.04:

pip uninstall PIL
apt-get install libjpeg-dev
apt-get install libfreetype6-dev
apt-get install zlib1g-dev
apt-get install libpng12-dev
pip install PIL --upgrade

when your see “– JPEG support avaliable” that means it works.

But, if it still doesn’t work when your edit your jpeg image, check the python path !! my python path missed /usr/local/lib/python2.7/dist-packages/PIL-1.1.7-py2.7-linux-x86_64.egg/, so I edit the ~/.bashrc add the following code to this file:

Edit: export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/dist-packages/PIL-1.1.7-py2.7-linux-x86_64.egg/

then, finally, it works!!

On Fedora 17 I had to install libjpeg-devel and afterwards reinstall PIL:

sudo yum install --assumeyes libjpeg-devel
sudo pip-python install --upgrade PIL

Rolo’s answer is excellent, however I had to reinstall Pillow by bypassing pip cache (introduced with pip 7) otherwise it won’t get properly recompiled!!! The command is:

pip install -I --no-cache-dir -v Pillow

and you can see if Pillow has been properly configured by reading in the logs this:

PIL SETUP SUMMARY
    --------------------------------------------------------------------
    version      Pillow 2.8.2
    platform     linux 3.4.3 (default, May 25 2015, 15:44:26)
                 [GCC 4.8.2]
    --------------------------------------------------------------------
    *** TKINTER support not available
    --- JPEG support available
    *** OPENJPEG (JPEG2000) support not available
    --- ZLIB (PNG/ZIP) support available
    --- LIBTIFF support available
    --- FREETYPE2 support available
    *** LITTLECMS2 support not available
    *** WEBP support not available
    *** WEBPMUX support not available
    --------------------------------------------------------------------

as you can see the support for jpg, tiff and so on is enabled, because I previously installed the required libraries via apt (libjpeg-dev libpng12-dev libfreetype6-dev libtiff-dev)

On Mac OS X Mavericks (10.9.3), I solved this by doing the follows:

Install libjpeg by brew (package management system)

brew install libjpeg

reinstall pillow (I use pillow instead of PIL)

pip install -I pillow

apt-get install libjpeg-dev
apt-get install libfreetype6-dev
apt-get install zlib1g-dev
apt-get install libpng12-dev

Install these and be sure to install PIL with pip because I compiled it from source and for some reason it didn’t work

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.

In the end all it took was reinstalling Pillow:

sudo pip uninstall Pillow
sudo pip install Pillow

I’m too newbie to comment zeantsoi post ;(. So here his what I needed to do to solved on OSX on 10.9.1 the

IOError: decoder jpeg not available

1) install Xcode tools (open your terminal and execute: xcode-select --install) – taken from this post: Can’t install PIL after Mac OS X 10.9

2) install libpng and libjpeg package (combo installer) from this link: http://ethan.tira-thompson.com/Mac_OS_X_Ports.html

3) reboot (not sure it was mandatory)

4) Re-install PIL with run pip install -I PIL (as I had initially installed PIL before having the issue)

Hope this help and don’t confuse more …

_oho

This question was posted quite a while ago and most of the answers are quite old too. So when I spent hours trying to figure this out, nothing worked, and I tried all suggestions in this post.

I was still getting the standard JPEG errors when trying to upload a JPG in my Django avatar form:

raise IOError("decoder %s not available" % decoder_name)
OSError: decoder jpeg not available

Then I checked the repository for Ubuntu 12.04 and noticed some extra packages for libjpeg. I installed these and my problem was solved:

sudo apt-get install libjpeg62 libjpeg62-dev

Installing these removed libjpeg-dev, libjpeg-turbo8-dev, and libjpeg8-dev.

Hope this helps someone in the year 2015 and beyond!

Cheers

Same problem here, JPEG support available but still got IOError: decoder/encoder jpeg not available, except I use Pillow and not PIL.

I tried all of the above and more, but after many hours I realized that using sudo pip install does not work as I expected, in combination with virtualenv. Silly me.

Using sudo effectively launches the command in a new shell (my understanding of this may not be entirely correct) where the virtualenv is not activated, meaning that the packages will be installed in the global environment instead. (This messed things up, I think I had 2 different installations of Pillow.)

I cleaned things up, changed user to root and reinstalled in the virtualenv and now it works.
Hopefully this will help someone!

For Fedora

Install pre-requisite
sudo dnf install make automake gcc gcc-c++ kernel-devel rpm-build libjpeg-devel zlib-devel python-devel
Now install Pillow

sudo pip install pillow

Note – For libjpeg and zlib we are installing libjpeg-devel and zlib-devel packages in Fedora/CentOS/Red Hat

First I had to delete the python folders in hidden folder user/appData (that was creating huge headaches), in addition to uninstalling Python. Then I installed WinPython Distribution: http://code.google.com/p/winpython/ which includes PIL

For those on Mac OS Mountain Lion, I followed the anwser of zeantsoi, but it doesn’t work.

I finally ended up with the solution of this post: http://appelfreelance.com/2010/06/libjpeg-pil-snow-leopard-python2-6-_jpeg_resync_to_restart/

Now, I’m happily running my script for jpeg !