title: how to reduce light intensity of an image
body: <p>Took an example image from opencv (cat.jpg).To reduce brightness at particular area. here is the link for the image</p>
  
  <p><a href="http://tinypic.com/view.php?pic=2lnfx46&amp;s=5" rel="nofollow">http://tinypic.com/view.php?pic=2lnfx46&amp;s=5</a></p>