This video demonstrates the use of luma mattes in Blender to achieve a pixelized look in your animations. I show a couple of ways to create luma mattes, how to deploy them in a separate scene and how to leverage the bilateral blurring composite node to speed up ray-trace ambient occlusion.

Feel free to download the BLEND file for the deployment scene here:
blenderartists.org/forum/showthread.php?t=208550

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