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sclass BWHistogram {
  IBWImage image; // optional
  int[] data; // pixel count for each brightness from 0 to 255
  int nPixels; // sum of pixel count
  
  *(BufferedImage image) {
    this(BWImage(image));
  }
  
  *(BWImage *image) {
    nPixels = area(image);
    data = bwImageHistogramArray(image);
  }
  
  toString { ret "BWHistogram of " + nPixels(nPixels); }
  
  int[] getArray() { ret data; }
}