Converts non-white pixels in a black & white image to an ArrayList of PVectors

alphaMaskToVectors.pde

ArrayList alphaMaskToVectors(String file){

  PImage img = loadImage(file);
  ArrayList vectors = new ArrayList();
  for (int i=0; i < img.width; i++) {
      for (int j=0; j < img.height; j++) {
        color c = img.get(i,j);
        if (red(c) != 255 && green(c) != 255 && blue(c) != 255) {
          vectors.add(new PVector(i,j));
        }
      }
  }

  return vectors;
}