C#图像处理（4）：图像的剪裁

图像的剪裁方法，从中间剪裁返回剪裁后的左右两页，方法实现如下：

         /// <summary>
         /// 图片裁剪，返回左右两页
         /// </summary>
         /// <param name="Img">图片</param>
         /// <param name="RightMargin">从中间剪裁时左边图片向右偏移量</param>
         /// <param name="LeftMargin">从中间剪裁时右边图片向左偏移量</param>
         /// <returns>Dictionary</returns>
         public Dictionary<string, Bitmap> ImgDiv(Image Img, int RightMargin, int LeftMargin)
         {
             Dictionary<string, Bitmap> DictImg = new Dictionary<string, Bitmap>();
             //获取图片宽高
             int Width = Img.Width;
             int Height = Img.Height;
             //获取图片水平和垂直的分辨率
             float dpiX = Img.HorizontalResolution;
             float dpiY = Img.VerticalResolution;
             //创建一个位图文件
             Bitmap BitmapResult = new Bitmap((Width / ) + RightMargin, Height, PixelFormat.Format24bppRgb);
             //设置位图文件的水平和垂直分辨率  与Img一致
             BitmapResult.SetResolution(dpiX, dpiY);
             //在位图文件上填充一个矩形框
             Graphics Grp = Graphics.FromImage(BitmapResult);
             System.Drawing.Rectangle Rec = new System.Drawing.Rectangle(, , (Width / ) + RightMargin, Height);
             Grp.DrawImage(Img, , , Rec, GraphicsUnit.Pixel);
             //返回位图文件
             Grp.Dispose();
             //获取左边图像
             DictImg["Left"] = BitmapResult;
             //在位图文件上填充一个矩形框
             Bitmap BitmapRight = new Bitmap((Width / ) + LeftMargin, Height, PixelFormat.Format24bppRgb);
             BitmapRight.SetResolution(dpiX, dpiY);
             Graphics GrpRight = Graphics.FromImage(BitmapRight);
             System.Drawing.Rectangle RecRight = new System.Drawing.Rectangle((Width / ) - LeftMargin, , (Width / ) + LeftMargin, Height);
             GrpRight.DrawImage(Img, , , RecRight, GraphicsUnit.Pixel);
             //获取右边图像
             DictImg["Right"] = BitmapRight;
             GrpRight.Dispose();
             GC.Collect();
             //返回位图文件
             return DictImg;
         }