title: iOS SDK Interface Builder's RGB slider producing different color than UIColor withRGB
body: <p>In interface builder I changed the color of a UILabel to this screenshot, having Red 255, Green 159, Blue 0 and Opacity at 100%. which gives an orange color.</p>
  
  <p><img src="https://i.stack.imgur.com/okNJo.png" alt="IB RGB Sliders">
  <img src="https://i.stack.imgur.com/3nUfS.png" alt="Color Produced in Center"></p>
  
  <p>I programmatically change the UILabel color than change it back to the original color using this...    </p>
  
  <pre><code>timeLabel.textColor = [UIColor colorWithRed:255.0 green:159.0 blue:0.0 alpha:1.0];
  </code></pre>
  
  <p>and it gives this color....
  <img src="https://i.stack.imgur.com/giclN.png" alt="UIColor color"></p>
  
  <p>I thought it should be the same, does anyone know what I'm doing wrong?
  please help, thanks.</p>