private void button1_Click(object sender, EventArgs e)         {             GraphicsPath path = new GraphicsPath();             Point[] p = {                             new Point(424,244),                             new Point(240,440),                             new Point(340,552),                             new Point(550,526),                             new Point(478,366),                             new Point(348,660),                             new Point(424,244)                         };             path.AddLines(p);             OpenFileDialog openFileDialog = new OpenFileDialog();             openFileDialog.Filter = @"Bitmap文件(*.bmp)|*.bmp|Jpeg文件(*.jpg)|*.jpg|所有合适文件(*.bmp,*.jpg)|*.bmp;*.jpg";             openFileDialog.FilterIndex = 3;             openFileDialog.RestoreDirectory = true;             if (DialogResult.OK == openFileDialog.ShowDialog())             {                 Bitmap bit = (Bitmap)Bitmap.FromFile(openFileDialog.FileName, false);                 Bitmap newBit = null;                 BitmapCrop(bit, path, out newBit);                 newBit.Save(@"C:\Users\Public\Pictures\Sample Pictures\沙漠22.jpg");             }         }

/// <summary>         /// 图片截图         /// </summary>         /// <param name="bitmap">原图</param>         /// <param name="path">裁剪路径</param>         /// <param name="outputBitmap">输出图</param>         /// <returns></returns>         public static Bitmap BitmapCrop(Bitmap bitmap, GraphicsPath path, out Bitmap outputBitmap)         {             RectangleF rect = path.GetBounds();             int left = (int)rect.Left;             int top = (int)rect.Top;             int width = (int)rect.Width;             int height = (int)rect.Height;             Bitmap image = (Bitmap)bitmap.Clone();             outputBitmap = new Bitmap(width, height);             for (int i = left; i < left + width; i++)             {                 for (int j = top; j < top + height; j++)                 {                     //判断坐标是否在路径中                       if (path.IsVisible(i, j))                     {                         //复制原图区域的像素到输出图片                           outputBitmap.SetPixel(i - left, j - top, image.GetPixel(i, j));                         //设置原图这部分区域为透明                           image.SetPixel(i, j, Color.FromArgb(0, image.GetPixel(i, j)));                     }                     else                     {                         outputBitmap.SetPixel(i - left, j - top, Color.FromArgb(0, 255, 255, 255));                     }                 }             }             bitmap.Dispose();             return image;         }