图片放大边缘

Question

Bitmap b =new Bitmap(pictureBox2.Image.Size.Width*2,pictureBox2.Image.Size.Height*2);
Graphics g = Graphics.FromImage(b);
g.Clear(Color.White); 
//g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.Invalid; 
//g.CompositingQuality=System.Drawing.Drawing2D.CompositingQuality.HighSpeed;

g.ScaleTransform(2, 2); 
g.DrawImage(pictureBox2.Image,0,0);
pictureBox2.Image=reDrawSaveImage(pictureBox2.Image,b.Width,b.Height);
怎么边缘模糊了...我想要的是WINDOWS画板那种效果.直接绘制 drawimage(image,0,0,width*2,height*2) 也是模糊的效果

Answer 1

 public static Image BitmapToBlowUp(Bitmap MyBitmap)
        {
            Bitmap b = MyBitmap;
            Bitmap setbmp = new Bitmap(MyBitmap.Width * 2, MyBitmap.Height * 2);
            for (int i = 0; i != b.Width; i++)
            {
                for (int z = 0; z != b.Height; z++)
                {                    Color t = b.GetPixel(i, z);
                    setbmp.SetPixel((i * 2), (z * 2), t);
                    setbmp.SetPixel((i * 2) + 1, (z * 2), t);
                    setbmp.SetPixel((i * 2), (z * 2) + 1, t);
                    setbmp.SetPixel((i * 2) + 1, (z * 2) + 1, t);
                }
            }
            return setbmp;
        }
 
想了半天.......这东西效率太低了 大的放大累死    谁能给出个更好的办法或则改进下 谢谢

Answer 2

你可以试试将pictureBox2中显示的原图片画到Bitmap 中,例如g.DrawImage(Image.FromFile("pictureBox2中显示的图片的路径"),0,0);

Answer 3

谢谢关注 放大了也是模糊的Bitmap bmp =new Bitmap(pictureBox1.Width*4,pictureBox1.Height*4); Graphics g=Graphics.FromImage(bmp); g.ScaleTransform(4, 4); 
g.DrawImage(Image.FromFile(@"C:\temp.bmp"),0,0);
pictureBox1.Image=bmp;
边缘模糊了 这样和直接放大是一样的.