title: ImageMagick: Error while running convert: convert: unable to read font
body: <p>I'm on Mountain Lion and installed ImageMagick using Homebrew (minimagick is also in my Gemfile but I don't think that's relevant). <a href="https://github.com/galetahub/simple-captcha">SimpleCaptcha</a> uses it in a Rails app to create CAPTCHAs. </p>
  
  <p>However, the image isn't created cause of this error:</p>
  
  <pre><code>Error while running convert: convert: unable to read font `/usr/local/share/ghostscript/fonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1123.
  convert: Postscript delegate failed `/var/folders/gd/n7rzfhkd5jd0ws8jnzsz34hr0000gn/T/magick-vzHHz4ZP': No such file or directory @ error/ps.c/ReadPSImage/830.
  convert: no images defined `/var/folders/gd/n7rzfhkd5jd0ws8jnzsz34hr0000gn/T/simple_captcha20121218-64930-1thtfpf.jpg' @ error/convert.c/ConvertImageCommand/3032.
  </code></pre>
  
  <p>Any ideas?</p>