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static BWImage posterizeBWImage(int brightnessLevels, BWImage img) {
  if (brightnessLevels >= 256 || img == null) ret img;
  byte[] pixels = img.getBytes();
  int w = img.getWidth(), h = img.getHeight(), n = pixels.length;
  byte[] pixels2 = new[n];
  double factor1 = doubleRatio(brightnessLevels, 256);
  double factor2 = doubleRatio(255, brightnessLevels-1);
  
  for i to n:
    pixels2[i] = iround(ifloor(ubyteToInt(pixels[i])*factor1)*factor2);
  
  ret new BWImage(w, h, pixels2);
}