@Override
	public int compare(StdImage o1, StdImage o2) {
		int result = Numbers.compare(o2.getWidth(), o1.getWidth());
		if (result == 0) {
			result = Numbers.compare(o2.getHeight(), o1.getHeight());
			if (result == 0) {
				result = Numbers.compare(o2.hashCode(), o1.hashCode());
			}
		}
		return result;
	}