title: imread() stopped working on Octave
body: <p>I've tried googling it and it seems nobody else has had this kind of error.</p>
  
  <p>I'm using Octave 3.6.1 on Ubuntu 12.04. I've been using the imread() funcion to read images for quite some time, but just yesterday it started throwing this error:</p>
  
  <pre><code>octave:5&gt; I = imread('example.jpg');
  error: imread: invalid image file: Magick++ exception: Magick: Unable to open file (tures/example.jpg) reported by coders/jpeg.c:955 (ReadJPEGImage)
  error: called from:
  error:   /usr/share/octave/3.6.1/m/image/imread.m at line 74, column 7
  </code></pre>
  
  <p>If I try to read a PNG, I get a similar error:</p>
  
  <pre><code>octave:5&gt; I = imread('example.png');
  error: imread: invalid image file: Magick++ exception: Magick: Unable to open file (tures/example.png) reported by coders/png.c:2790 (ReadPNGImage)
  error: called from:
  error:   /usr/share/octave/3.6.1/m/image/imread.m at line 74, column 7
  </code></pre>
  
  <p>Does anybody know what's happening? How to fix this?</p>
  
  <p>Thanks a lot!</p>