Hello, all. First-time poster here. I have THIS image:

flickr(DOT)com/photos/88899571@N03/8973035673/

And I need it to have the gradient-like effect found in THIS image:

flickr(DOT)com/photos/88899571@N03/8974228422/

Please help me out. Also, I must to stress that the dimensions must stay exactly the same. No adding/removing pixels! Thanks in advanced!