简单的GDI+处理图片大小(C#代码)

        /// <summary>
        /// 缩放图片
        /// </summary>
        /// <param name="img">原图片</param>
        /// <param name="xWith">缩放宽比例,如果想缩小图片,小于100</param>
        /// <param name="yHeight">缩放高比例</param>
        /// <returns>返回处理后图片</returns>
        public Image scaleImg(System.Drawing.Image img, int xWith, int yHeight)
        {
            //计算处理后图片宽
            int i = Convert.ToInt32(img.Width * xWith / 100);
            //计算处理后图片高
            int j = Convert.ToInt32(img.Height * yHeight / 100);
            //格式化图片
            System.Drawing.Image imgScale = new System.Drawing.Bitmap(i, j, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(imgScale);
            System.Drawing.Rectangle srcRect = new System.Drawing.Rectangle(0, 0, img.Width, img.Height);
            System.Drawing.Rectangle desRect = new System.Drawing.Rectangle(0, 0, imgScale.Width, imgScale.Height);
            g.Clear(System.Drawing.Color.White);
            g.DrawImage(img, desRect, srcRect, System.Drawing.GraphicsUnit.Pixel);
            //处理后的图片另存
            imgScale.Save("E:\\1111.jpg", System.Drawing.Imaging.ImageFormat.Gif);
            g.Dispose();
            return imgScale;
        }