title: ios: change the colors of a UIImage
body: <p>I am working on an Iphone application.</p>
  
  <p>I have png pictures that represents symbols. symbols are all black with a transparent background.</p>
  
  <p>Is there a way I can turn the black color into another one? What I'm looking for is something that can help me choose the color I want and when using the symbols (in a UIImage) I can make them appear the color of my choice.</p>
  
  <p>I have searched around and found a framework called OpenCV that can manipulate images but I cant find out how to recolor the picture.</p>
  
  <p>Any help and suggestion is greatly appreciated.</p>
  
  <p>Thank you</p>