You will have to be more specific in your question because right not it is pretty vague and leaves lots of guessing.

Are you perhaps interested in converting the raster image into verctorized image so that you would be able to easily scale it with the least quality loss?
Are you perhaps interested in extracting 2D shapes out of the image and storing them as series of triangles?
Perhaps you have a texture atlas and which is storing multiple textures and you want a tool that will return position of those textures in form of triangles so that you can easily pas them to low level rendering methods?
Or perhaps you need something completely different.