title: Ruby / RMagick rotate and combine images
body: <p>I'm trying to rotate an image before composing it ontop of another, using RMagick with ruby. I can compose the overlaid image but when I try to rotate the image parts of the background are removed, like so...</p>
  
  <p><img src="https://i.stack.imgur.com/3DM2M.jpg" alt="enter image description here"></p>
  
  <p>Im not sure which CompositeOperator I should be using, or if this is the wrong approach all together?</p>
  
  <pre><code>image = Magick::Image.read("img.jpg").first         
  overlay = Magick::Image.read("./overlay.png").first
  overlay.rotate!(9)
  image.composite!(overlay, 100, 50, Magick::OverCompositeOp)
  image.to_blob
  </code></pre>