title: Changing image resolution
body: <p>1) problem 1 (down sample with exact factor) other components:</p>
  
  <p>e.g.</p>
  
  <p>I have an image with 304X212 .png and would like to down sample it by half to 152x106 resolution. </p>
  
  <p>2) problem 2 (down sample with no specific factor) for background image:</p>
  
  <p>e.g.</p>
  
  <p>I have an image with 480X320 .png and would like to change its resolution to 568X192.</p>
  
  <p>I have an image with 1024x384 .png and would like to change its resolution to 480x320.</p>
  
  <p>This <a href="http://wallpaperswide.com/apple_logo_on_fire-wallpapers.html" rel="nofollow">website</a> provides the same image with different resolution. How do they do it?</p>
  
  <p>The reason to do this is to provide image asset for both the iPad and iPhone. I am not proficient with any image processing software. Just a typical iOS developer starting to develop using spritekit.</p>
  
  <p>Please help. Thank you very much in advance.</p>