using System;
using System.Drawing;
using System.Drawing.Imaging;

namespace CSharp_Imaging_Moire_Fringe
{
    public sealed class Imaging
    {
        private static BitmapData _BitmapData = new BitmapData();
        
        #region Moire_Fringe( Bitmap ObjectBitmap )

        public static void Moire_Fringe( Bitmap ObjectBitmap )
        {
            try
            {
                if( ObjectBitmap == null )
                {
                    return;
                }

                _BitmapData = ObjectBitmap.LockBits( new Rectangle( 0 , 0 , ObjectBitmap.Width , ObjectBitmap.Height ) , ImageLockMode.ReadWrite , PixelFormat.Format24bppRgb );
                
                unsafe
                {
                    byte* P = (byte *)_BitmapData.Scan0;

                    for( int i = 0 ; i < _BitmapData.Height / 2 ; i++ )
                    {    
                        for( int j = 0 ; j < _BitmapData.Width / 2 ; j++ )
                        {    
                            P += 3;    
                            P[2] = P[1] = P[0] = 0;
                            P += 3;
                        }

                        for( int k = 0 ; k < _BitmapData.Width / 2 ; k++ )
                        {    
                            P[2] = P[1] = P[0] = 0;
                            P += 6;
                        }
                    }
                }
            }
            catch( Exception E )
            {
                System.Windows.Forms.MessageBox.Show( E.ToString() );
            }
            finally
            {
                ObjectBitmap.UnlockBits( _BitmapData );
            }
        }    
    
        #endregion
    }
}

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

namespace CSharp_Imaging_Moire_Fringe
{
    public class Form1 : System.Windows.Forms.Form
    {
        #region Windows 窗体设计器生成的代码
        
        private System.Windows.Forms.PictureBox pictureBox1;
        private System.Windows.Forms.PictureBox pictureBox2;
        private System.ComponentModel.IContainer components = null;

        public Form1()
        {
            InitializeComponent();
        }

        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            this.pictureBox2 = new System.Windows.Forms.PictureBox();
            this.SuspendLayout();
            // 
            // pictureBox1
            // 
            this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
            this.pictureBox1.Location = new System.Drawing.Point(44, 38);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(256, 256);
            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
            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(332, 38);
            this.pictureBox2.Name = "pictureBox2";
            this.pictureBox2.Size = new System.Drawing.Size(256, 256);
            this.pictureBox2.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
            this.pictureBox2.TabIndex = 1;
            this.pictureBox2.TabStop = false;
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.BackColor = System.Drawing.Color.White;
            this.ClientSize = new System.Drawing.Size(632, 333);
            this.Controls.Add(this.pictureBox2);
            this.Controls.Add(this.pictureBox1);
            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
            this.MaximizeBox = false;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "C# - Imaging - Moire Fringe";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }
        

        [STAThread]
        private static void Main() 
        {
            Application.Run( new Form1() );
        }

        #endregion

        private void Form1_Load( object sender, System.EventArgs e )
        {
            Imaging.Moire_Fringe( (Bitmap)pictureBox2.Image );
        }
    }
}