title: How make a image using multiple images using Carrierwave and MiniMagick
body: <p>I have <code>Image</code> model and <code>Movie</code> model and <code>Movie</code> can have many <code>images</code>. I am storing 3 versions of an image, <code>big, medium and small</code>. 
  In my app users can pick images of a particular size lets say 4 images of `medium' size and then user can share them. Minimum 3 images and maximum 5.</p>
  
  <p>I need to create a image with all selected 4 images of medium size. I do not want to send these images individually, I want to send it as a single image.</p>
  
  <p>I am using <code>Carrierwave</code> and <code>MiniMagick</code>.</p>
  
  <p>Thanks for help!</p>