Closes #22

Author: ldesousa

workshop/jupyter/content/data/HighPassFilter.png

@@ -408,9 +408,7 @@
    "source": [
     "With a raster band encapsulated into an array, map algebra and analysis in general become rather simple. As an example, consider the high pass filter defined by the moving window below:\n",
     "\n",
-    "|  0 | -1 |  0 |\n",
-    "| -1 |  4 | -1 |\n",
-    "|  0 | -1 |  0 |\n",
+    "![High-pass filter](../data/HighPassFilter.png)\n",
     "\n",
     "This is a typical operation in digital imaging processing that also finds application in raster analysis. Applying this moving window to a NumPy array requires the following:"
    ]