/// <summary>
        /// 圖片裁剪，生成新圖，儲存在同一目錄下,名字加_new，格式1.png 新圖1_new.png
        /// </summary>
        /// <param name="picPath">要修改圖片完整路徑</param>
        /// <param name="x">修改起點x座標</param>
        /// <param name="y">修改起點y座標</param>
        /// <param name="width">新圖寬度</param>
        /// <param name="height">新圖高度</param>
        public static void caijianpic(String picPath,int x,int y,int width,int height)
        {
            //圖片路徑
            String oldPath = picPath;
            //新圖片路徑
            String newPath = System.IO.Path.GetExtension(oldPath);
            //計算新的檔名，在舊檔名後加_new
            newPath = oldPath.Substring(0, oldPath.Length - newPath.Length) + "_new" + newPath;
            //定義擷取矩形
            System.Drawing.Rectangle cropArea = new System.Drawing.Rectangle(x, y, width, height);
            //要擷取的區域大小
            //載入圖片
            System.Drawing.Image img = System.Drawing.Image.FromStream(new System.IO.MemoryStream(System.IO.File.ReadAllBytes(oldPath)));
            //判斷超出的位置否
            if ((img.Width < x + width) || img.Height < y + height)
            {
                MessageBox.Show("裁剪尺寸超出原有尺寸！");
                img.Dispose();
                return;
            }
            //定義Bitmap物件
            System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(img);
            //進行裁剪
            System.Drawing.Bitmap bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);
            //儲存成新檔案
            bmpCrop.Save(newPath);
            //釋放物件
            img.Dispose(); bmpCrop.Dispose();
        }


        /// <summary>
        /// 呼叫此函式後使此兩種圖片合併，類似相簿，有個
        /// 背景圖，中間貼自己的目標圖片
        /// </summary>
        /// <param name="sourceImg">貼上的源圖片</param>
        /// <param name="destImg">貼上的目標圖片</param>
        public static Image CombinImage(string sourceImg, string destImg)
        {
            Image imgBack = System.Drawing.Image.FromFile(sourceImg); //相框圖片 
            Image img = System.Drawing.Image.FromFile(destImg); //照片圖片
            //從指定的System.Drawing.Image建立新的System.Drawing.Graphics       
            Graphics g = Graphics.FromImage(imgBack);
            //g.DrawImage(imgBack, 0, 0, 148, 124); // g.DrawImage(imgBack, 0, 0, 相框寬, 相框高);
            g.FillRectangle(System.Drawing.Brushes.Black, -50, -50, (int)212, ((int)203));//相片四周刷一層黑色邊框，這裡沒有，需要調尺寸
            //g.DrawImage(img, 照片與相框的左邊距, 照片與相框的上邊距, 照片寬, 照片高);
            g.DrawImage(img, -50, -50, 212, 203);
            GC.Collect();
            string saveImagePath ="D:/測試資料夾/sss.png";
            //save new image to file system.
            imgBack.Save(saveImagePath, ImageFormat.Png);
            return imgBack;
        }