Read Big Tiff and JPEG files (>(23000 x 23000) pix) in a stream. And display part of it to the screen in realtime.

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;
using System.Diagnostics;
using System.IO;
using BitMiracle.LibTiff.Classic;



namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Rectangle rect = new Rectangle(new Point(4200, 2450), new Size(this.pictureBox1.Width, this.pictureBox1.Height));
            //Rectangle rect = new Rectangle(new Point(0, 0), new Size(200, 200));

            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            this.pictureBox1.Image = funcCropImage(@"IMG 382 Panorama.tif", rect);
            stopWatch.Stop();
            this.label1.Text = stopWatch.ElapsedMilliseconds.ToString();
        }
       

        private  Bitmap funcCropImage(string filepath, Rectangle rect)
        {

            int x = 0;// For new created image
            int y = 0;// For new created image
          
            byte red ;  
            byte green;   
            byte blue;
            //byte alpha;
                     

            Color color;

            Bitmap  cropedImage =  new Bitmap (rect.Width, rect.Height);

            using (Tiff image = Tiff.Open(filepath, "r"))
            {
                int stride = image.ScanlineSize();  
                byte[] scanline = new byte[stride]; 

                Compression compression = (Compression)image.GetField(TiffTag.COMPRESSION)[0].ToInt();

                if (compression == Compression.NONE)
                {
                    // Uncomressed images are much faster to crop so it is better to use uncompressed
                    for (int j = rect.Top; j < rect.Bottom; j++)
                    {
                        image.ReadScanline(scanline, j);
                        x = 0;
                        for (int i = rect.Left; i < rect.Right; i++)
                        {
                            red = scanline[i * 3];
                            green = scanline[i * 3 + 1];
                            blue = scanline[i * 3 + 2];
                            //alpha = scanline [i * 3 + 3];                        

                            color = Color.FromArgb(red, green, blue);

                            //color = Color.FromArgb(alpah, red, green, blue);

                            cropedImage.SetPixel(x, y, color);

                            x++;
                        }
                        y++;
                    }
                }//If               
                

            }
            
            return cropedImage;
        }////


    }
}