Graphics g = System.Drawing.Graphics.FromImage(ReducedImage);

                // 设置画布的描绘质量

                g.CompositingQuality = CompositingQuality.HighQuality;

                g.SmoothingMode = SmoothingMode.HighQuality;

                g.InterpolationMode = InterpolationMode.HighQualityBicubic;

        private static Image CutPicture(int X, int Y, int Width, int Height, Image image)

        {

            if (image.Width < X + Width 
------解决方案--------------------
 image.Height < Y + Height)

            {

                MessageBox.Show("截取的区域超过了图片本身的高度、宽度", "错误！", MessageBoxButtons.OK, MessageBoxIcon.Error);

                return null;

            }

            Bitmap Bmp = new Bitmap(image);

            Rectangle cloneRect = new Rectangle(X, Y, Width, Height);

            Bitmap cloneBmp = Bmp.Clone(cloneRect, Bmp.PixelFormat);

            return cloneBmp;

        }