title: Turning a color bmp to grayscale:
body: <p>I've seen this code on the web:</p>
  
  <pre><code>Bitmap grayscaleBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); 
  
  Canvas c = new Canvas(grayscaleBitmap); 
  Paint p = new Paint(); 
  ColorMatrix cm = new ColorMatrix(); 
  
  cm.setSaturation(0); 
  ColorMatrixColorFilter filter = new ColorMatrixColorFilter(cm); 
  p.setColorFilter(filter);  
  c.drawBitmap(bmp, 0, 0, p); 
  </code></pre>
  
  <p>My questions are:
  1.  Is 'bmp' supposed to be the color bitmap I want to affect?
  2.  How do I get the 0-255 value of the grayscale?</p>
  
  <p>Thanks.</p>