title: Converting Image To B&W, sepia, GrayScale etc in iPhone SDK
body: <p>I was searching on the google if I get something for add effect to the Image like <code>Black &amp; White</code>, <code>Sepia</code>, <code>grayScale</code> etc. I found a useful link for converting Image in <code>Sepia</code> but there is nothing for converting it in B&amp;W or Grayscale. </p>
  
  <p>Here is the link <a href="http://groups.google.com/group/iphonesdkdevelopment/browse_thread/thread/b987b02deec08b9f" rel="nofollow">http://groups.google.com/group/iphonesdkdevelopment/browse_thread/thread/b987b02deec08b9f</a></p>
  
  <p>After going through the code I come to know that we need to change RBG for that but How to get RBG for <code>B&amp;W</code> and <code>grayScale</code>. What will be the RBG ratio for these kind of effects.</p>
  
  <p>Any help will be appreciate.</p>
  
  <p>Thanks In Advance </p>