去装订孔问题

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为什么这样的装订孔去不掉，前提图像是黑白色的  ,,
代码    HolePunchRemoveCommand _HolePunchRemove = null;
            _HolePunchRemove = new HolePunchRemoveCommand();
            _HolePunchRemove.MaximumHoleCount = 4;
            _HolePunchRemove.MinimumHoleCount = 2;
            _HolePunchRemove.MaximumHoleWidth = 0;
            _HolePunchRemove.MaximumHoleHeight = 0;
            _HolePunchRemove.MinimumHoleWidth = 0;
            _HolePunchRemove.MinimumHoleHeight = 0;
            _HolePunchRemove.Run(_Imageview.Image);