Ошибка System.OutOfMemoryException при загрузки картинки - C#

        private void выбратьИзображениеToolStripMenuItem1_Click(object sender, EventArgs e)
        {
                string NameF = "";
                openFileDialog1.CheckPathExists = true;
                openFileDialog1.ValidateNames = true;
                openFileDialog1.Filter = "image files (*.jpg,*.bmp,*png)|*.jpg;*bmp;*png|All files (*.*)|*.*";
                if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK && openFileDialog1.FileName.Length > 0)
                {
                    NameF = openFileDialog1.FileName;
                }
                if (NameF.Length > 0)
                {
                    System.IO.FileStream fs = new System.IO.FileStream(NameF, System.IO.FileMode.Open);
                    System.Drawing.Image Im = System.Drawing.Image.FromStream(fs);
                    fs.Close();
                    if (Im.Size.Width > 1501)
                    {   
                        Im = ResizeOrigImg(Im);
                        pictureBox1.Image = Im;
                    }
                    else
                    {
                        pictureBox1.Image = Im;
                    }
                }
                StartImage();
        }
        public Image ResizeOrigImg(Image image)
        {
            int nWidth = 1500;
            double N = image.Size.Width - 1500;
            double i = Convert.ToDouble(image.Size.Width) / N;
            double nHeight = Convert.ToDouble(image.Size.Height) - Convert.ToDouble(image.Size.Height) / i;
            
            int newWidth, newHeight;
            var coefH = (double)nHeight / (double)image.Height;
            var coefW = (double)nWidth / (double)image.Width;
            if (coefW >= coefH)
            {
                newHeight = (int)(image.Height * coefH);
                newWidth = (int)(image.Width * coefH);
            }
            else
            {
                newHeight = (int)(image.Height * coefW);
                newWidth = (int)(image.Width * coefW);
            }
 
            Image result = new Bitmap(newWidth, newHeight);//, PixelFormat.Format8bppIndexed);
            using (var g = Graphics.FromImage(result))
            {
                try
                {
                    g.CompositingQuality = CompositingQuality.HighQuality;
                    g.SmoothingMode = SmoothingMode.HighQuality;
                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    GC.Collect();
                    GC.WaitForPendingFinalizers();
                    GC.Collect();
                    g.DrawImage(image, 0, 0, newWidth, newHeight);
                    g.Dispose();
                }
                catch (Exception j)
                {
                    MessageBox.Show("Ошибка - " + j.ToString());
                }
            }
            return result;
        }