title: image_to_string doesn't work in Mac
body: <p>I'm trying to follow this example of pytesser (<a href="https://code.google.com/p/pytesser/wiki/README" rel="noreferrer">link</a>) in a Mac Maverick.</p>
  
  <pre><code>&gt;&gt;&gt; from pytesser import *
  &gt;&gt;&gt; im = Image.open('phototest.tif')
  &gt;&gt;&gt; text = image_to_string(im)
  </code></pre>
  
  <p>But, in the last line I get this error message:</p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "pytesser.py", line 31, in image_to_string
      call_tesseract(scratch_image_name, scratch_text_name_root)
    File "pytesser.py", line 21, in call_tesseract
      proc = subprocess.Popen(args)
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 711, in __init__
      errread, errwrite)
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1308, in _execute_child
      raise child_exception
  OSError: [Errno 2] No such file or directory
  </code></pre>
  
  <p>But, I don't understand what I should do. The file phototest is in the same folder I'm running the script. How to fix this?</p>
  
  <p>UPDATE:</p>
  
  <p>When I try</p>
  
  <pre><code>brew install tesseract
  </code></pre>
  
  <p>I get this error:</p>
  
  <pre><code>Warning: It appears you have MacPorts or Fink installed.
  Software installed with other package managers causes known problems for
  Homebrew. If a formula fails to build, uninstall MacPorts/Fink and try again.
  Error: You must `brew link libtiff libpng jpeg' before tesseract can be installed
  </code></pre>