title: ImageMagick no encode delegate
body: <p>I used to be able to convert text to an image using ImageMagick but now I get this error message:</p>
  
  <pre><code>$ echo text | convert -background none text:- file
  convert: no encode delegate for this image format `TEXT' @ error/constitute.c/WriteImage/1167.
  </code></pre>
  
  <p>ImageMagick was installed using Homebrew</p>
  
  <pre><code>imagemagick: stable 7.0.7-10 (bottled), HEAD
  Tools and libraries to manipulate images in many formats
  https://www.imagemagick.org/
  /usr/local/Cellar/imagemagick/7.0.7-10 (1,523 files, 23.1MB) *
    Poured from bottle on 2017-11-10 at 15:46:33
  From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/imagemagick.rb
  </code></pre>