C#图像处理(各种旋转、改变大小、柔化、锐化、雾化、底片、浮雕、黑白、滤镜效果)

一、各种旋转、改变大小注意：先要添加画图相关的using引用。//向右旋转图像90°代码如下:PRivate void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");//加载图像g.FillRectangle(Brushes.White, this.ClientRectangle);//填充窗体背景为白色Point[] destinationPoints = {new Point(100, 0), // destination for upper-left point of originalnew Point(100, 100),// destination for upper-right point of originalnew Point(0, 0)}; // destination for lower-left point of originalg.DrawImage(bmp, destinationPoints);}//旋转图像180°代码如下:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);Point[] destinationPoints = {new Point(0, 100), // destination for upper-left point of originalnew Point(100, 100),// destination for upper-right point of originalnew Point(0, 0)}; // destination for lower-left point of originalg.DrawImage(bmp, destinationPoints);}//图像切变代码:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);Point[] destinationPoints = {new Point(0, 0), // destination for upper-left point of originalnew Point(100, 0), // destination for upper-right point of originalnew Point(50, 100)};// destination for lower-left point of originalg.DrawImage(bmp, destinationPoints);}//图像截取:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);Rectangle sr = new Rectangle(80, 60, 400, 400);//要截取的矩形区域Rectangle dr = new Rectangle(0, 0, 200, 200);//要显示到Form的矩形区域g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);}//改变图像大小:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);int width = bmp.Width;int height = bmp.Height;// 改变图像大小使用低质量的模式g.InterpolationMode = InterpolationMode.NearestNeighbor;g.DrawImage(bmp, new Rectangle(10, 10, 120, 120), // source rectanglenew Rectangle(0, 0, width, height), // destination rectangleGraphicsUnit.Pixel);// 使用高质量模式//g.CompositingQuality = CompositingQuality.HighSpeed;g.InterpolationMode = InterpolationMode.HighQualityBicubic;g.DrawImage(bmp,new Rectangle(130, 10, 120, 120), new Rectangle(0, 0, width, height),GraphicsUnit.Pixel);}//设置图像的分辩率:private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Bitmap bmp = new Bitmap("rama.jpg");g.FillRectangle(Brushes.White, this.ClientRectangle);bmp.SetResolution(300f, 300f);g.DrawImage(bmp, 0, 0);bmp.SetResolution(1200f, 1200f);g.DrawImage(bmp, 180, 0);}//用GDI+画图private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics gForm = e.Graphics;gForm.FillRectangle(Brushes.White, this.ClientRectangle);for (int i = 1; i <= 7; ++i){//在窗体上面画出橙色的矩形Rectangle r = new Rectangle(i*40-15, 0, 15,this.ClientRectangle.Height);gForm.FillRectangle(Brushes.Orange, r);}//在内存中创建一个Bitmap并设置CompositingModeBitmap bmp = new Bitmap(260, 260,System.Drawing.Imaging.PixelFormat.Format32bppArgb);Graphics gBmp = Graphics.FromImage(bmp);gBmp.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;// 创建一个带有Alpha的红色区域// 并将其画在内存的位图里面Color red = Color.FromArgb(0x60, 0xff, 0, 0);Brush redBrush = new SolidBrush(red);gBmp.FillEllipse(redBrush, 70, 70, 160, 160);// 创建一个带有Alpha的绿色区域Color green = Color.FromArgb(0x40, 0, 0xff, 0);Brush greenBrush = new SolidBrush(green);gBmp.FillRectangle(greenBrush, 10, 10, 140, 140);//在窗体上面画出位图 now draw the bitmap on our windowgForm.DrawImage(bmp, 20, 20, bmp.Width, bmp.Height);// 清理资源bmp.Dispose();gBmp.Dispose();redBrush.Dispose();greenBrush.Dispose();}//在窗体上面绘图并显示图像private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e){Graphics g = e.Graphics;Pen blackPen = new Pen(Color.Black, 1);if (ClientRectangle.Height / 10 > 0){for (int y = 0; y < ClientRectangle.Height; y += ClientRectangle.Height / 10){g.DrawLine(blackPen, new Point(0, 0), new Point(ClientRectangle.Width, y));}}blackPen.Dispose();} C# 使用Bitmap类进行图片裁剪  在Mapwin（手机游戏地图编辑器）生成的地图txt文件中添加自己需要处理的数据后转换成可在手机（Ophone）开发环境中使用的字节流地图文件的小工具，其中就涉及到图片的裁剪和生成了。有以下几种方式。 方法一：拷贝像素。 当然这种方法是最笨的，效率也就低了些。在Bitmap类中我们可以看到这样两个方法：GetPixel（int x, int y）和SetPixel（int x, int y, Color color）方法。从字面的含以上就知道前者是获取图像某点像素值，是用Color对象返回的；后者是将已知像素描画到制定的位置。下面就来做个实例检验下：1.首先创建一个Windows Form窗体程序，往该窗体上拖放7个PictureBox控件，第一个用于放置并显示原始的大图片，其后6个用于放置并显示裁剪后新生成的6个小图；2.放置原始大图的PictureBox控件name属性命名为pictureBoxBmpRes，其后pictureBox1到pictureBox6依次命名，并放置在合适的位置；3.双击Form窗体，然后在Form1_Load事件中加入下面的代码即可。//导入图像资源            Bitmap bmpRes = null;            String strPath = application.ExecutablePath;            try{                int nEndIndex = strPath.LastIndexOf('//');                strPath = strPath.Substring(0,nEndIndex) + "//Bmp//BmpResMM.bmp";                bmpRes = new Bitmap(strPath);                 //窗体上显示加载图片                pictureBoxBmpRes.Width = bmpRes.Width;                pictureBoxBmpRes.Height = bmpRes.Height;                pictureBoxBmpRes.Image = bmpRes;            }            catch(Exception ex)            {               System.Windows.Forms.MessageBox.Show("图片资源加载失败！/r/n" + ex.ToString());            }             //裁剪图片(裁成2行3列的6张图片)            int nYClipNum = 2, nXClipNum = 3;            Bitmap[] bmpaClipBmpArr = new Bitmap[nYClipNum * nXClipNum];                        for (int nYClipNumIndex = 0; nYClipNumIndex < nYClipNum; nYClipNumIndex++)            {                for (int nXClipNumIndex = 0; nXClipNumIndex < nXClipNum; nXClipNumIndex++)                {                    int nClipWidth = bmpRes.Width / nXClipNum;                    int nClipHight = bmpRes.Height / nYClipNum;                    int nBmpIndex = nXClipNumIndex + nYClipNumIndex * nYClipNum + (nYClipNumIndex > 0?1:0);                    bmpaClipBmpArr[nBmpIndex] = new Bitmap(nClipWidth, nClipHight);                     for(int nY = 0; nY < nClipHight; nY++)                    {                        for(int nX = 0; nX < nClipWidth; nX++)                        {                            int nClipX = nX + nClipWidth * nXClipNumIndex;                            int nClipY = nY + nClipHight * nYClipNumIndex;                            Color cClipPixel = bmpRes.GetPixel(nClipX, nClipY);                            bmpaClipBmpArr[nBmpIndex].SetPixel(nX, nY, cClipPixel);                        }                    }                                   }            }            PictureBox[] picbShow = new PictureBox[nYClipNum * nXClipNum];            picbShow[0] = pictureBox1;            picbShow[1] = pictureBox2;            picbShow[2] = pictureBox3;            picbShow[3] = pictureBox4;            picbShow[4] = pictureBox5;            picbShow[5] = pictureBox6;            for (int nLoop = 0; nLoop < nYClipNum * nXClipNum; nLoop++)            {                picbShow[nLoop].Width = bmpRes.Width / nXClipNum;                picbShow[nLoop].Height = bmpRes.Height / nYClipNum;                picbShow[nLoop].Image = bmpaClipBmpArr[nLoop];                           } 现在看看那些地方需要注意的了。其中int nBmpIndex =nXClipNumIndex + nYClipNumIndex * nYClipNum + (nYClipNumIndex > 0?1:0); 这句定义了存储裁剪图片对象在数组中的索引，需要注意的就是后面的(nYClipNumIndex > 0?1:0)——因为只有当裁剪的对象处于第一行以外的行时需要将索引加1；另外，因为这种方法的效率不高，程序运行起来还是顿了下。如果有兴趣的话，可以将以上的代码放到一个按钮Click事件函数中，当单击该按钮时就可以感觉到了。  方法二：运用Clone函数局部复制。 同样在Bitmap中可以找到Clone（）方法，该方法有三个重载方法。Clone（），Clone（Rectangle， PixelFormat）和Clone（RectangleF， PixelFormat）。第一个方法将创建并返回一个精确的实例对象，后两个就是我们这里需要用的局部裁剪了（其实后两个方法本人觉得用法上差不多）。将上面的程序稍稍改进下——将裁剪的处理放到一个按钮事件函数中，然后再托一个按钮好窗体上，最后将下面的代码复制到该按钮的事件函数中。for (int nYClipNumIndex = 0; nYClipNumIndex < nYClipNum; nYClipNumIndex++){       for (int nXClipNumIndex = 0; nXClipNumIndex < nXClipNum; nXClipNumIndex++)         {              int nClipWidth = bmpRes.Width / nXClipNum;                      int nClipHight = bmpRes.Height / nYClipNum;