Python PIL cannot locate my "libjpeg"

Question

I cannot use PIL because it cannot find my libjpeg!

First, I installed PIL default. And when I ran the selftest.py, it gave me:

IOError: decoder jpeg not available 1
items had failures:    1 of  57 in
selftest.testimage
***Test Failed*** 1 failures.
*** 1 tests of 57 failed.

Then, I followed instructions online to change PIL's setup.py to

JPEG_ROOT = "/usr/lib"

Because when I locate libjpeg, this is what I get:

locate libjpeg 
/usr/lib/libjpeg.so.62
/usr/lib/libjpeg.so.62.0.0
/usr/lib64/libjpeg.so.62
/usr/lib64/libjpeg.so.62.0.0
/usr/share/doc/libjpeg-6b
/usr/share/doc/libjpeg-6b/README
/usr/share/doc/libjpeg-6b/usage.doc
/var/cache/yum/base/packages/libjpeg-6b-37.i386.rpm
/var/cache/yum/base/packages/libjpeg-6b-37.x86_64.rpm

So, I ran setup.py install again...and did selftest.py. And I still get the same error!

Answer 1

There at least 3 header sets that you will want to install. 1 more if you want to deal with Tiff's

freetype, libjpeg, zlib all of which will be in the following packages on CentOS:

== 32 Bit: zlib-devel.i386 libjpeg-devel.i386 freetype-devel.i386

== 64 Bit: zlib-devel.x86_64 libjpeg-devel.x86_64 freetype-devel.x86_64

As you did before you will want to edit the following variables in the setup.py file:

FREETYPE_ROOT JPEG_ROOT ZLIB_ROOT

Setting there values to /usr/lib or /usr/lib64 based on your platform. Once done you will most likely want to run

python setup.py build --force
python setup.py install

That will force rebuild all your lib for PIL and reinstall them raw.

Answer 2

You need the libjpeg headers as well, not only the library itself. Those packages are typically called something ending in headers or dev, depending on what distribution you have.