A NatronNation Tidbit,
Filters are very important and needed in compositing when dealing with pixel base or bitmap media. Not all the nodes has the same filters. They are process specific. The attached images are from the Resize & Transform nodes and help note from the Resize node to guide you are recommended filters. The best way to see how they process your pixel/bitmap media is to zoom in to sub-pixel level and switch from filter to filter. There is an a lot of math going on.
The Resize node has gain a few extra filters over the Natron V2 beta development. Study and apply them when needed or necessary.
See attached images below.