c# 如何把两幅图片叠加输出

Question

后台输出多一个picturebox在新的picturebox1后面            PictureBox newbitmap =new PictureBox();
            PictureBox oldbitmap = new PictureBox();
            oldbitmap.Location = new Point(newbitmap.Location.X + newbitmap.Width, newbitmap.Location.Y);//跟在第一个PictureBox 后面
            this.Controls.Add(oldbitmap);

Answer 1

            Bitmap newbitmap = new Bitmap(textBox1.Text);
            Bitmap oldbitmap = new Bitmap(textBox2.Text);            //上下合并
            int iWidth = newbitmap.Width > oldbitmap.Width ? newbitmap.Width : oldbitmap.Width;
            int iHeight = newbitmap.Height + oldbitmap.Height;
            Bitmap bitmap = new Bitmap(iWidth, iHeight);            Graphics g = Graphics.FromImage(bitmap);
            g.DrawImage(newbitmap, new Rectangle(0, 0, newbitmap.Width, newbitmap.Height), new Rectangle(0, 0, newbitmap.Width, newbitmap.Height), GraphicsUnit.Pixel);
            g.DrawImage(oldbitmap, new Rectangle(0, newbitmap.Height, oldbitmap.Width, oldbitmap.Height), new Rectangle(0, 0, oldbitmap.Width, oldbitmap.Height), GraphicsUnit.Pixel);
            g.Dispose();            pictureBox1.Image = bitmap;

Answer 2

怎么个叠加，是Alpha混合，还是做 and 运算，或者做 or 运算，或者 xor运算。

Answer 3

你噪声图有Alpha 或者 透明色么

Answer 4

你可以把有噪声那一张凡是没有点的像素Alpha分量全部置为0。如果不设置Alpha，那么底色不是透明而是白色，就把下面的图片挡住了。

Answer 5

int Height = this.pictureBox1.Image.Height;
            int Width = this.pictureBox1.Image.Width;
            Bitmap newbitmap = new Bitmap(Width, Height);
            Bitmap oldbitmap = (Bitmap)this.pictureBox1.Image;
            //this.textBox1.Text = (newbitmap.Width.ToString());
            //this.textBox2.Text = (newbitmap.Height.ToString());
            if (pictureBox1 != null)
            {
                Form2 noise = new Form2();
                if (noise.ShowDialog() == DialogResult.OK)
                {
                    Rectangle rect = new Rectangle(0, 0, newbitmap.Width, newbitmap.Height);
                    System.Drawing.Imaging.BitmapData bmpData = newbitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, newbitmap.PixelFormat);
                    IntPtr ptr = bmpData.Scan0;
                    int bytes = newbitmap.Width * newbitmap.Height;                    this.textBox1.Text = (newbitmap.Width.ToString());                    byte[] grayValues = new byte[bytes];
                    System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
                    double temp = 0;
                    byte flagNoise = noise.GetFlag;
                    double[] paraNoise = new double[2];
                    paraNoise = noise.GetParaN;                    Random r1, r2;
                    double v1, v2;
                    r1 = new Random(unchecked((int)DateTime.Now.Ticks));
                    r2 = new Random(~unchecked((int)DateTime.Now.Ticks));                    for (int i = 0; i < bytes; i++)
                    {
                        switch (flagNoise)
                        {
                            case 0:
                                do
                                {
                                    v1 = r1.NextDouble();
                                }
                                while (v1 <= 0.00000000001);
                                v2 = r2.NextDouble();
                                temp = Math.Sqrt(-2 * Math.Log(v1)) * Math.Cos(2 * Math.PI * v2) * paraNoise[1] + paraNoise[0];
                                break;
                            case 1:
                                v1 = r1.NextDouble();
                                if (v1 <= paraNoise[0])
                                    temp = -500;
                                else if (v1 >= (1 - paraNoise[1]))
                                    temp = 500;
                                else
                                    temp = 0;
                                break;
                            default:
                                MessageBox.Show("无效！");
                                break;
                        }
                        temp = temp + grayValues[i];                        if (temp > 255)
                        {
                            grayValues[i] = 255;
                        }
                        else if (temp < 0)
                        {
                            grayValues[i] = 0;
                        }
                        else
                            grayValues[i] = Convert.ToByte(temp);
                    }
                    System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
                    newbitmap.UnlockBits(bmpData);
                    
                    int iWidth = newbitmap.Width;
                    int iHeight = newbitmap.Height;
pictureBox1.Image = newbitmap;

Answer 6

你可以把有噪声那一张凡是没有点的像素Alpha分量全部置为0。如果不设置Alpha，那么底色不是透明而是白色，就把下面的图片挡住了。
我代码写在下面，能具体说下如何改么

Answer 7

Bitmap oldbitmap = (Bitmap)this.pictureBox1.Image;
Bitmap newbitmap = oldbitmap;

Answer 8

我就是想把一张图加入不同种类噪声，然后输出在到picturebox里面，用上面的代码问题很多，失败了。有好一点的办法么

Answer 9

我就是想把一张图加入不同种类噪声，然后输出在到picturebox里面，用上面的代码问题很多，失败了。有好一点的办法么
10楼的方法试过么，你上面的代码创建了一个新位图，然后根据噪声修改像素，再把这个图赋给图片控件，并不是在原图上做这些操作，所以你看到5楼的图int Height = this.pictureBox1.Image.Height;
            int Width = this.pictureBox1.Image.Width;
            Bitmap oldbitmap = (Bitmap)this.pictureBox1.Image;
            //this.textBox1.Text = (newbitmap.Width.ToString());
            //this.textBox2.Text = (newbitmap.Height.ToString());
            if (pictureBox1 != null)
            {
                Form2 noise = new Form2();
                if (noise.ShowDialog() == DialogResult.OK)
                {
                    Rectangle rect = new Rectangle(0, 0, oldbitmap.Width, oldbitmap.Height);
                    System.Drawing.Imaging.BitmapData bmpData = oldbitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, oldbitmap.PixelFormat);
                    IntPtr ptr = bmpData.Scan0;
                    int bytes = oldbitmap.Width * oldbitmap.Height;
 
                    this.textBox1.Text = (oldbitmap.Width.ToString());
 
                    byte[] grayValues = new byte[bytes];
                    System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
                    double temp = 0;
                    byte flagNoise = noise.GetFlag;
                    double[] paraNoise = new double[2];
                    paraNoise = noise.GetParaN;
 
                    Random r1, r2;
                    double v1, v2;
                    r1 = new Random(unchecked((int)DateTime.Now.Ticks));
                    r2 = new Random(~unchecked((int)DateTime.Now.Ticks));
 
                    for (int i = 0; i < bytes; i++)
                    {
                        switch (flagNoise)
                        {
                            case 0:
                                do
                                {
                                    v1 = r1.NextDouble();
                                }
                                while (v1 <= 0.00000000001);
                                v2 = r2.NextDouble();
                                temp = Math.Sqrt(-2 * Math.Log(v1)) * Math.Cos(2 * Math.PI * v2) * paraNoise[1] + paraNoise[0];
                                break;
                            case 1:
                                v1 = r1.NextDouble();
                                if (v1 <= paraNoise[0])
                                    temp = -500;
                                else if (v1 >= (1 - paraNoise[1]))
                                    temp = 500;
                                else
                                    temp = 0;
                                break;
                            default:
                                MessageBox.Show("无效！");
                                break;
                        }
                        temp = temp + grayValues[i];
 
                        if (temp > 255)
                        {
                            grayValues[i] = 255;
                        }
                        else if (temp < 0)
                        {
                            grayValues[i] = 0;
                        }
                        else
                            grayValues[i] = Convert.ToByte(temp);
                    }
                    System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
                    oldbitmap.UnlockBits(bmpData);
                     
                    int iWidth = oldbitmap.Width;
                    int iHeight = oldbitmap.Height;
pictureBox1.Image = oldbitmap;简单点就直接在原图操作了

Answer 10

我就是想把一张图加入不同种类噪声，然后输出在到picturebox里面，用上面的代码问题很多，失败了。有好一点的办法么
10楼的方法试过么，你上面的代码创建了一个新位图，然后根据噪声修改像素，再把这个图赋给图片控件，并不是在原图上做这些操作，所以你看到5楼的图
简单点就直接在原图操作了
谢谢你，这样就成功了。 还有个问题就是为什么只有一半的图像有噪声？