[Bug 1174729] [NEW] PIL Image.open() raises "IOError: cannot identify image file" on all image files since update to 13.04

[nimu]

Public bug reported:

This code worked perfectly in Ubuntu 12.10 and stopped working in ubuntu
13.04:

import Image
img = Image.open( "path/to/img.jpg" )

It always raises an "IOError: cannot identify image file". Tested with
several images. I don't know of any API changes in PIL and the same code
works in Windows and Ubuntu 12.10

lsb_release -rd output:
Description:	Ubuntu 13.04
Release:	13.04

apt-cache policy python-imaging output:
python-imaging:
  Installiert:           1.1.7+2.0.0-1
  Installationskandidat: 1.1.7+2.0.0-1
  Versionstabelle:
 *** 1.1.7+2.0.0-1 0
        500 http://de.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: python-imaging (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Changed in: python-imaging (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1174729

Title:
  PIL Image.open() raises "IOError: cannot identify image file" on all
  image files since update to 13.04

Status in “python-imaging” package in Ubuntu:
  Invalid

Bug description:
  This code worked perfectly in Ubuntu 12.10 and stopped working in
  ubuntu 13.04:

  import Image
  img = Image.open( "path/to/img.jpg" )

  It always raises an "IOError: cannot identify image file". Tested with
  several images. I don't know of any API changes in PIL and the same
  code works in Windows and Ubuntu 12.10

  lsb_release -rd output:
  Description:	Ubuntu 13.04
  Release:	13.04

  apt-cache policy python-imaging output:
  python-imaging:
    Installiert:           1.1.7+2.0.0-1
    Installationskandidat: 1.1.7+2.0.0-1
    Versionstabelle:
   *** 1.1.7+2.0.0-1 0
          500 http://de.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status

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