info graphic library for c-sharp

Question

Hi everyone, I'm new in C# but I currently implementing a tile maker with this language. My scope is to divide an image (Earth Observation - JPEG format) in several tiles (samples). Up to now we divide the image in several rectangles. But we want now to resample some of these rectangle towards a triangle form (This is to deal with the loss of information at the pole). I 'm looking to some libraries that may perform this operation (resampling or transformation to rectangle to triangle) Do you Know if this kind of library exist ? Thanks for your help. Margot