static L<Pt> pixelsInImageList(BufferedImage image) {
  ret pixelsInImageList(image.getWidth(), image.getHeight());
}

static L<Pt> pixelsInImageList(WidthAndHeight etc size) {
  int h = size.h(), w = size.w();
  ret listFromFunction(w*h, idx -> pt(idx % w, idx/w));
}