title: Python unsharp mask
body: <p>I want to use <code>unsharp mask</code> on a 16 Bit Image.</p>
  <p>The Image has <code>640 x 480 Pixels</code> and is saved in a NumPy array.</p>
  <p>I have done the following:</p>
  <ul>
  <li>blurred the image with a <code>Gaussian filter</code> (three different methods)</li>
  <li>then, created a mask by subtracting the blur Image form the original</li>
  <li>finally, added the mask multiplied by <code>WightFaktor</code> to the original Image</li>
  </ul>
  <p>But it doesn´t really work.</p>
  <p>Here is the Python code:</p>
  <pre><code>Gaussian1 = ndimage.filters.gaussian_filter(Image,sigma=10.0)
  Gaussian2 = filters.gaussian_filter(Image,sigma=10.0)
  Gaussian3 = cv2.GaussianBlur(Image,(9,9),sigmaX=10.0)
  
  Mask1 = Image - Gaussian1
  UnsharpImage = Image + (WightFaktor*Mask1)
  </code></pre>