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 }
