sinterface IBWImage extends MakesBufferedImage {
  float getFloatPixel(int x, int y); // usually between 0 and 1
  int getInt(int x, int y);
  
  default float getFloatPixel(Pt p) { ret getFloatPixel(p.x, p.y); }
  
  public default BufferedImage getBufferedImage() {
    ret grayImageFromIBWImage(this);
  }
}