static void sendImageToProgram(ImageIcon img, S progID) {
  sendImageToProgram(img.getImage(), progID);
}

static void sendImageToProgram(final Image img, final S progID) {
  thread "Sending image to program" {
    Class c = hotwire(progID);
    O bwImage = nuForeignObject(c, "main$BWImage", img);
    set(c, "img", bwImage);
    callMain(c);
  }
}