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;

         }