title: Resize image with mogrify without keeping aspect ratio
body: <p>I feel silly for having to ask such a simple question, but I have spent the past hour having absolutely no luck whatsoever finding a solution to this. Everyone seems like they need to do the exact opposite of what I need to do.</p>
  
  <p>My question is simply how do I tell mogrify and/or convert to not keep the aspect ratio when resizing an image? I need the image to be an exact power of 2 for both width and height and the images do not come in a 1:1 ratio which means one side has to stretch.</p>
  
  <p>The closest thing I have to an answer is the -extent flag, but that just extends the canvas. I need the original image to fill the entire thing.</p>