title: sepia version of any NSImage
body: <p>I am looking for a simple and efficient way to give a special tint to any icon contained in an NSImage. My initial need id to have sepia icons but if  can use other colors it is better.</p>
  
  <p>Do you have any idea to achieve this?</p>
  
  <p>Thanks in advance for your help,</p>
  
  <p>Regards,</p>