form1.cs

color image to greyscale image to binary image

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Imaging;

namespace image
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private Bitmap b;
		private System.Windows.Forms.MainMenu mainMenu1;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem menuItem2;
		private System.Windows.Forms.MenuItem menuItem3;
		private System.Windows.Forms.MenuItem menuItem4;
		private System.Windows.Forms.PictureBox Pic;
		private System.Windows.Forms.MenuItem menuItem7;
		private System.Windows.Forms.MenuItem menuItem8;
		private System.Windows.Forms.MenuItem Process;
		private System.Windows.Forms.MenuItem menuItem5;
		private System.Windows.Forms.MenuItem menuItem6;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		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.mainMenu1 = new System.Windows.Forms.MainMenu();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.menuItem2 = new System.Windows.Forms.MenuItem();
			this.menuItem3 = new System.Windows.Forms.MenuItem();
			this.menuItem4 = new System.Windows.Forms.MenuItem();
			this.Process = new System.Windows.Forms.MenuItem();
			this.menuItem7 = new System.Windows.Forms.MenuItem();
			this.menuItem8 = new System.Windows.Forms.MenuItem();
			this.Pic = new System.Windows.Forms.PictureBox();
			this.menuItem5 = new System.Windows.Forms.MenuItem();
			this.menuItem6 = new System.Windows.Forms.MenuItem();
			this.SuspendLayout();
			// 
			// mainMenu1
			// 
			this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menuItem1,
																					  this.Process});
			// 
			// menuItem1
			// 
			this.menuItem1.Index = 0;
			this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menuItem2,
																					  this.menuItem3,
																					  this.menuItem4});
			this.menuItem1.Text = "File";
			// 
			// menuItem2
			// 
			this.menuItem2.Index = 0;
			this.menuItem2.Text = "Open";
			this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
			// 
			// menuItem3
			// 
			this.menuItem3.Index = 1;
			this.menuItem3.Text = "-";
			// 
			// menuItem4
			// 
			this.menuItem4.Index = 2;
			this.menuItem4.Text = "Exit";
			// 
			// Process
			// 
			this.Process.Enabled = false;
			this.Process.Index = 1;
			this.Process.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					this.menuItem7,
																					this.menuItem8,
																					this.menuItem5,
																					this.menuItem6});
			this.Process.Text = "Processing";
			// 
			// menuItem7
			// 
			this.menuItem7.Index = 0;
			this.menuItem7.Text = "GrayScale";
			this.menuItem7.Click += new System.EventHandler(this.menuItem7_Click);
			// 
			// menuItem8
			// 
			this.menuItem8.Index = 1;
			this.menuItem8.Text = "-";
			// 
			// Pic
			// 
			this.Pic.Location = new System.Drawing.Point(8, 8);
			this.Pic.Name = "Pic";
			this.Pic.Size = new System.Drawing.Size(144, 144);
			this.Pic.TabIndex = 0;
			this.Pic.TabStop = false;
			// 
			// menuItem5
			// 
			this.menuItem5.Index = 2;
			this.menuItem5.Text = "Binary";
			this.menuItem5.Click += new System.EventHandler(this.menuItem5_Click);
			// 
			// menuItem6
			// 
			this.menuItem6.Index = 3;
			this.menuItem6.Text = "-";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.Pic});
			this.Menu = this.mainMenu1;
			this.Name = "Form1";
			this.Text = "Connected Components";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void menuItem2_Click(object sender, System.EventArgs e)
		{			
			OpenFileDialog dlg=new OpenFileDialog();
			dlg.Title="Sample";						
			string file="";
			dlg.Filter="Bitmaps/Gif/jpeg (*.bmp;*.gif)|*.gif;*.bmp;*.jpg";
			if (dlg.ShowDialog()== DialogResult.OK)
			{
				file=dlg.FileName;
			}			
			else
			{
				MessageBox.Show("Please Enter a Valid File");
				menuItem2_Click(sender,e);
			}			
			b=new Bitmap(file);
			Pic.Width=b.Width;
			Pic.Height=b.Height;
			Pic.Image=b;	
			this.Process.Enabled=true;
		}

	
		private void menuItem7_Click(object sender, System.EventArgs e)
		{
			GrayScale(b);
			Pic.Image=b;
		}

	
		public bool GrayScale(Bitmap b)
		{
			// GDI+ still lies to us - the return format is BGR, NOT RGB. 
			BitmapData bmData = b.LockBits(new Rectangle(0,0, b.Width, b.Height), 
				ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb); 
			int stride = bmData.Stride; //the length of the line
			System.IntPtr Scan0 = bmData.Scan0; 

			unsafe
			{
				byte * p = (byte*)(void*)Scan0;

				int nOffset =  stride - b.Width*3;

				byte red, green, blue;

				for(int y=0;y < b.Height;++y)
				{
					for(int x=0; x < b.Width; ++x )
					{
						blue = p[0];
						green = p[1];
						red = p[2];

						p[0] = p[1] = p[2] = (byte)(.299 * red 
							+ .587 * green 
							+ .114 * blue);

						p += 3;
					}
					p += nOffset;
				}
			}		
			
			b.UnlockBits(bmData);

			return true;
		}

		private void menuItem5_Click(object sender, System.EventArgs e)
		{
		Binary(b,true);
		Pic.Image=b;
		}
		public bool Binary(Bitmap b,bool flag)
		{
			// GDI+ still lies to us - the return format is BGR, NOT RGB. 
			BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), 
				ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb); 
			int stride = bmData.Stride; //the length of the line
			System.IntPtr Scan0 = bmData.Scan0; 
			int Threshold=220;
			unsafe
			{
				byte * p = (byte *)(void *)Scan0;

				int nOffset = stride - b.Width*3;

				byte red, green, blue;
				byte binary;

				for(int y=0;y < b.Height;++y)
				{
					for(int x=0; x < b.Width; ++x )
					{
						blue = p[0];
						green = p[1];
						red = p[2];

						binary= (byte)(.299 * red 
							+ .587 * green 
							+ .114 * blue);
						
						if (binary<Threshold&&flag)
							p[0] = p[1] = p[2] = 0;
						else
							if (binary>=Threshold&&flag)
							p[0] = p[1] = p[2] = 255;
						else
							if (binary<Threshold&&!flag)
							p[0] = p[1] = p[2] = 255;
						else
							p[0] = p[1] = p[2] = 0;
						p += 3;
					}
					p += nOffset;
				}

			}		
			
			b.UnlockBits(bmData);
			return true;
		}
	}
}