commander>Sharpen
   macro>
      comment>Add a new Sharpend layer and apply the sharpening filter with default settings
      >>>SharpenLayer = pdb.gimp_layer_new_from_visible(theImage, theImage, "Sharpen")
      >>>theImage.add_layer(SharpenLayer,0)
      comment>Sharpen parameters - Radius = 5.0; Amount = 0.5; Threshold = 0
      >>>pdb.plug_in_unsharp_mask(theImage, SharpenLayer, 5.0, 0.5, 0)

      comment>Adjust the opacity based on Property EnhanceContrastLevel
      >>>SharpenLayer.opacity = 75.0

