I'm not sure you can (at least not easily) though I've got very little experience here. bitmaps and vectorized graphics are just two completely different beasts, so I'm dubious that an arbitrary bitmap can be converted at all, especially on-the-fly. Think of it this way: vectorized graphics are basically instructions like "draw a curve so long and so thick, then draw a line from here to there, then..." whereas bitmap graphics are "dump the following pixel points to the screen: red, red, black, green, red, ...." You'll need to [re]create the images in SVG format using some art program that saves the actual vectorized stroke information, not just the final rendered image. That is, unless someone with better information shows I'm completely wrong here. ;-)