图样DrawImage缩放方法?

给定以下代码:

    var target = new Bitmap(source.Size.Width / 2, source.Size.Height / 2);
    using (var g = Graphics.FromImage(target))
    {
        g.DrawImage(source, new Rectangle(Point.Empty, target.Size));
        g.Save();
        return target;
    }

“DrawImage”使用什么缩放方法?它是平均4个像素吗?{0,0)处的值?我可以调整此行为吗?

谢谢