title: matlab plot image as background to graph
body: <p>I have an image that I would like to set as the background of plot I am making. However it plots it so that the image taks up the axis([0 1000 0 1000]) while the axis for my graph is much smaller: ([24.5 24.6 67 67.1]). How do I align it so that the image is on the same scale as the graph?</p>
  
  <p>I am performing the following commands:</p>
  
  <pre><code>h = figure;
  hold on
  voronoi(lats,longs);
  I=imread('my_fig.png');
  hi = imagesc(I);
  set(hi,'alphadata',.5);
  </code></pre>