สอบถามการรับค่าสี และการตัดแถวที่ไม่ต้องการออก ครับ [C# Win App]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace bmp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            const int maxSize = 2304;
            Bitmap image1 = new Bitmap(@"0012_Postjung_ป.bmp", true);
            
            /* Bitmap image1 = new Bitmap(@name, true);*/
            PictureBox1.Image = image1;
            int[] cell = new int[maxSize];
            int xx, yy, iii = 0;
            int ymax = image1.Height;
            int xmax = image1.Width;        
 
            string strOut = "";
            
            for (yy = 0; yy < ymax ; yy++)
            {
                for (xx = 0; xx < xmax; xx++)
                {
                    Color pixelColor = image1.GetPixel(xx, yy);
                    if (pixelColor.R > 208)
                    {
                        cell[iii] = 0;                       
                    }
                    else
                    {
                        cell[iii] = 1;                              
                    }
                    strOut += cell[iii];  
                    iii++;
                }  
                strOut += "\t\t";
            }
            textBox1.Text = strOut.ToString();       
            
        }
    }
}