title: Can you change one colour to another in an Bitmap image?
body: <p>For <code>Bitmap</code>, there is a <code>MakeTransparent</code> method, is there one similar for changing one color to another?</p>
  
  <pre><code>// This sets Color.White to transparent
  Bitmap myBitmap = new Bitmap(sr.Stream);
  myBitmap.MakeTransparent(System.Drawing.Color.White);
  </code></pre>
  
  <p>Is there something that can do something like this?</p>
  
  <pre><code>Bitmap myBitmap = new Bitmap(sr.Stream);
  myBitmap.ChangeColor(System.Drawing.Color.Black, System.Drawing.Color.Gray);
  </code></pre>