sinterface IBinaryImage extends MakesBufferedImage {
  bool getBoolPixel(int x, int y);
  
  default void setPixel(int x, int y, bool b) { throw unimplemented(); }
  
  default bool getBoolPixel(Pt p) {
    ret getBoolPixel(p.x, p.y);
  }
  
  default bool getBoolPixel_noRangeCheck(int x, int y) { ret getBoolPixel(x, y); }

  public default BufferedImage getBufferedImage() {
    ret toImage2B().getBufferedImage();
  }
  
  default Image2B toImage2B() {
    ret this instanceof Image2B ? (Image2B) this : iBinaryImageToImage2B(this);
  }
}