how to merge to picture box

[ramkumarm]

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Imaging;
namespace load_image
{
 /// <summary>
 /// Summary description for Form1.
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.OpenFileDialog openFileDialog1;
  private System.Windows.Forms.PictureBox pictureBox1;       
  private System.Windows.Forms.PictureBox pictureBox2;  
        private System.Windows.Forms.PictureBox pictureBox3;
        private Button button1;
        private Button button2;
        private IContainer components;
  public Form1()
  {
   //
   // Required for Windows Form Designer support
   //
   InitializeComponent();
   //
   // TODO: Add any constructor code after InitializeComponent call
   //
  }
  /// <summary>
  /// Clean up any resources being used.
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }
  #region Windows Form Designer generated code
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {
            this.components = new System.ComponentModel.Container();
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
            this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
 
            this.pictureBox2 = new System.Windows.Forms.PictureBox();
            this.pictureBox3 = new System.Windows.Forms.PictureBox();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).BeginInit();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox3)).BeginInit();
            this.SuspendLayout();
            //
            // pictureBox1
            //
            this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
            this.pictureBox1.Location = new System.Drawing.Point(13, 3);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(256, 240);
            this.pictureBox1.TabIndex = 0;
            this.pictureBox1.TabStop = false;
 
            //
            // pictureBox2
            //
            this.pictureBox2.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox2.Image")));
            this.pictureBox2.Location = new System.Drawing.Point(284, 1);
            this.pictureBox2.Name = "pictureBox2";
            this.pictureBox2.Size = new System.Drawing.Size(256, 240);
            this.pictureBox2.TabIndex = 2;
            this.pictureBox2.TabStop = false;
            //
            // pictureBox3
            //
            this.pictureBox3.Location = new System.Drawing.Point(12, 256);
            this.pictureBox3.Name = "pictureBox3";
            this.pictureBox3.Size = new System.Drawing.Size(425, 231);
            this.pictureBox3.TabIndex = 3;
            this.pictureBox3.TabStop = false;
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(465, 429);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 4;
            this.button1.Text = "Merge ";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // button2
            //
            this.button2.Location = new System.Drawing.Point(465, 458);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(75, 23);
            this.button2.TabIndex = 5;
            this.button2.Text = "Save";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(561, 497);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.pictureBox3);
            this.Controls.Add(this.pictureBox2);
            this.Controls.Add(this.pictureBox1);           
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).EndInit();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox3)).EndInit();
            this.ResumeLayout(false);
  }
  #endregion
  /// <summary>
  /// The main entry point for the application.
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  } 
 
 
  public Bitmap Merge( Bitmap bmp , Bitmap bmpimg)
  {
   BitmapData bmpData = bmpimg.LockBits( new Rectangle( 0 , 0 , bmpimg.Width , bmpimg.Height ) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb );
   BitmapData bmpData2 = bmp.LockBits( new Rectangle( 0 , 0 , bmp.Width  , bmp.Height ) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb );
   int width = bmpData.Width;
   int height = bmpData.Height;
   if( bmpData2.Width > width )
    width = bmpData2.Width;
   if( bmpData2.Height > height )
    height = bmpData2.Height;
   bmpimg.UnlockBits( bmpData );
   bmp.UnlockBits( bmpData2 );
 
   Bitmap bit1 = new Bitmap( bmpimg , width , height );
   Bitmap bit2 = new Bitmap( bmp , width , height );
   Bitmap bmpresult = new Bitmap( width , height );
   BitmapData data1 = bit1.LockBits( new Rectangle( 0 , 0 , bit1.Width , bit1.Height ) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb );
   BitmapData data2 = bit2.LockBits( new Rectangle( 0 , 0 , bit2.Width , bit2.Height ) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb );
   BitmapData data3 = bmpresult.LockBits( new Rectangle( 0 , 0 , bmpresult.Width , bmpresult.Height ) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb);
   unsafe
   {
    int remain1 = data1.Stride - data1.Width * 3;
    int remain2 = data2.Stride - data2.Width * 3;
    int remain3 = data3.Stride - data3.Width * 3;
 
    byte* ptr1 = ( byte* )data1.Scan0;
    byte* ptr2 = ( byte* )data2.Scan0;
    byte* ptr3 = ( byte* )data3.Scan0;
 
    for( int i = 0 ; i < height ; i ++ )
    {
     for( int j = 0 ; j < width * 3 ; j ++ )
     {
      ptr3[ 0 ] = ( ptr2[ 0 ] > ptr1[ 0 ] ) ? ptr2[ 0 ] : ptr1[ 0 ];
 
      ptr1 ++;
      ptr2 ++;
      ptr3 ++;
     }
     ptr1 += remain1;
     ptr2 += remain2;
     ptr3 += remain3;
    }
 
   }
   bit1.UnlockBits( data1 );
   bit2.UnlockBits( data2 );
   bmpresult.UnlockBits( data3 );
   return bmpresult;
  } 
        private void button1_Click(object sender, EventArgs e)
        {
            pictureBox3.Image = Merge(new Bitmap(pictureBox2.Image), new Bitmap(pictureBox1.Image));   
        }
        private void button2_Click(object sender, EventArgs e)
        {
                pictureBox3.Image.Save("C:\\mypic.jpg");
        }
 
 
 
 }
}

[debasisdas]

Question moved to .NET Forum.