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：

 1         /// <summary>

 2         /// 图片裁剪，返回左右两页

 3         /// </summary>

 4         /// <param name="Img">图片</param>

 5         /// <param name="RightMargin">从中间剪裁时左边图片向右偏移量</param>

 6         /// <param name="LeftMargin">从中间剪裁时右边图片向左偏移量</param>

 7         /// <returns>Dictionary</returns>

 8         public Dictionary<string, Bitmap> ImgDiv(Image Img, int RightMargin, int LeftMargin)

 9         {

10             Dictionary<string, Bitmap> DictImg = new Dictionary<string, Bitmap>();

11             //获取图片宽高

12             int Width = Img.Width;

13             int Height = Img.Height;

14             //获取图片水平和垂直的分辨率

15             float dpiX = Img.HorizontalResolution;

16             float dpiY = Img.VerticalResolution;

17             //创建一个位图文件

18             Bitmap BitmapResult = new Bitmap((Width / 2) + RightMargin, Height, PixelFormat.Format24bppRgb);

19             //设置位图文件的水平和垂直分辨率  与Img一致

20             BitmapResult.SetResolution(dpiX, dpiY);

21             //在位图文件上填充一个矩形框

22             Graphics Grp = Graphics.FromImage(BitmapResult);

23             System.Drawing.Rectangle Rec = new System.Drawing.Rectangle(0, 0, (Width / 2) + RightMargin, Height);

24             Grp.DrawImage(Img, 0, 0, Rec, GraphicsUnit.Pixel);

25             //返回位图文件

26             Grp.Dispose();

27             //获取左边图像

28             DictImg["Left"] = BitmapResult;

29             //在位图文件上填充一个矩形框

30             Bitmap BitmapRight = new Bitmap((Width / 2) + LeftMargin, Height, PixelFormat.Format24bppRgb);

31             BitmapRight.SetResolution(dpiX, dpiY);

32             Graphics GrpRight = Graphics.FromImage(BitmapRight);

33             System.Drawing.Rectangle RecRight = new System.Drawing.Rectangle((Width / 2) - LeftMargin, 0, (Width / 2) + LeftMargin, Height);

34             GrpRight.DrawImage(Img, 0, 0, RecRight, GraphicsUnit.Pixel);

35             //获取右边图像

36             DictImg["Right"] = BitmapRight;

37             GrpRight.Dispose();

38             GC.Collect();

39             //返回位图文件

40             return DictImg;

41         }