Great to see a more generic pure-.NET image processing library. When I was doing this 5 years ago we basically had AForge.NET which was focused more on correctness of algorithms than speed. I tried to leverage that, but instead ended up with a totally custom image processing pipeline instead -- oh the battles with the GC and unsafe code...

Out of curiosity what is your overall vision for the library? Are you looking for a System.Drawing high-level API or more of an OpenCV-like low-level API?