title: composite stretch layered image
body: <p>how can I layer one smaller image on another larger image, and then stretch the smaller image to get the same dimension as the other?</p>
  
  <p>tmp.png is 210*22px</p>
  
  <p>bg.png is 10*22px</p>
  
  <p>composite bg.png tmp.png tmp.png</p>