// Demonstrate the use of the getHistogram and Plot.create functions

  requires("1.31l");
  bins = 256;
  getHistogram(values, counts, bins);
  is8bits = bitDepth()==8 || bitDepth()==24;
  Plot.create("Histogram", "Pixel Value", "Count", values, counts);

  n = 0;
  sum = 0;
  min = 9999999;
  max = -9999999;

  for (i=0; i<bins; i++) {
      count = counts[i];
      if (count>0) {
          n += count;
          sum += count*i;
          if (i<min) min = i;
          if (i>max) max = i;
      }
  }
  var x=0.025, y=0.1; // global variables
  draw("Pixel Count: "+n);
  if (is8bits) {
      if (counts[0]>0 || counts[255]>0) {
          draw("Black Pixels: "+counts[0]+" ("+counts[0]*100/n+"%)");
          draw("White Pixels: "+counts[255]+" ("+counts[255]*100/n+"%)");
      }
      draw("Mean: "+sum/n);
      draw("Min: "+min);
      draw("Max: "+max);   
  }

  function draw(text) {
      Plot.addText(text, x, y);
      y += 0.08;
  }