title: background image size iphone
body: <p>Normal background image is 320x480 pixels. and for retina is 640x960 pixels.</p>
  
  <p>Now i have to put my background image and i have status bar(20) and navigation bar (44).</p>
  
  <p>So i have to reduce 64(20+44) from 480(normal) or from 960(retina)?</p>
  
  <ol>
  <li>if i reduce 64 from normal then normal image will be 320x416 pixels and retina will be 640x832 pixels.</li>
  <li>if i reduce 64 from retina then normal will be 320x448 and retina will be 640x896 .</li>
  </ol>
  
  <p>It is confusing me.. this 64(20+44) i reduce from which image type because other one will be exactly half or double of it. </p>