《一》int Height=this.pictureBox1.Image.Height;
            int Width=this.pictureBox1.Image.Width;
            Bitmap bitmap=new Bitmap(Width,Height);
            Bitmap MyBitmap=(Bitmap)this.pictureBox1.Image;
            Color pixel;
            for(int x=1;x<Width;x++)
            {
                for(int y=1;y<Height;y++)
                {
                    int r,g,b;
                    pixel=MyBitmap.GetPixel(x,y);
                    r=255-pixel.R;
                    g=255-pixel.G;
                    b=255-pixel.B;
                    bitmap.SetPixel(x,y,Color.FromArgb(r,g,b));
                }
            }
《二》  int iWidth=this.pictureBox1.Width;
            int iHeight=this.pictureBox1.Height;
            Graphics g=this.pictureBox1.CreateGraphics();
            g.Clear(Color.Gray);
            for(int y=0;y<iHeight;y++)
            {
                g.DrawImage(MyBitmap,0,0,iWidth,y);
            }   
这些代码是啥意思呀？？我不明白···，请大家帮助一下，最好详细一些，毕竟我是不明白的···

先谢谢你的解释···
那一个呢？？？
这一个我试过了，是一种
反色的效果
看上去不咋好看！但效果挺明显的
呵呵···

谢谢···