title: Replace a specific color by another in an image/sprite
body: <p>I am trying to make a game with HTML5's canvas. I have some sprites, I am able to load them well, and they work fine, but some of the parts of the image are specifically <code>#ff0000</code> and I would like to be able to replace it by some other color, a custom user defined color.</p>
  
  <p>I don't really have a lead on this, I sort of saw image filters, but I didn't really find any examples suited for my usage, and don't have the brains to think it up on my own, trust me, I've tried.</p>
  
  <p>Any help, lead, or whatsoever will be greatly appreciated.</p>