// Saves each pixel in the current image (one per line) 
// as a text file in tab-delimited x y z value format.

  f = File.open("");
  for (z=0; z<nSlices; z++) {
     setSlice(z+1);
     for (y=0; y<getHeight; y++) {
         for (x=0; x<getWidth; x++) {
             value = calibrate(getPixel(x,y));
             print(f, x + "  \t" + y + " \t" + z+ " \t" + value);
         }
     }
  }