title: Find coordinates in canvas Gnuplot
body: <p>I've made a graph using gnuplot and converted it to a png-file (Canvas). I want to know the exact coordinate for every point in the generated png-file but the problem is that the graph is in the middle of the canvas which gives me the wrong coordinates. Hope it wasn't too hard to follow.. Could upload a picture if it would make it easier to understand..</p>
  
  <p>Thanks in advance!</p>