imager

#region resize
        private void btnResize_Click(object sender, EventArgs e)
        {
            if (!tbHeight.Equals("") && !tbWidth.Equals(""))
            {
                //img = resizeImage(pbShow.Image, new Size(Convert.ToInt32(tsWidth.Text), Convert.ToInt32(tsHeight.Text)));
                //pbShow.SizeMode = PictureBoxSizeMode.CenterImage;
                //img = resizeImage(img, new Size(Convert.ToInt32(tbWidth.Text), Convert.ToInt32(tbHeight.Text)));
                //img = pbShow.Image;
                img = resize.ResizeImage(new Size(Convert.ToInt32(tbWidth.Text), Convert.ToInt32(tbHeight.Text)), img, false);
                SetImage2();

            }
        }

        private void ts50_Click(object sender, EventArgs e)
        {
            img = pbShow.Image;

            int newWidth = (int)(img.Width * 0.5);
            int newHeight = (int)(img.Height * 0.5);

            img = resize.ResizeImage(new Size(newWidth, newHeight), img, true);
            SetImage2();
        }

        private void ts100_Click(object sender, EventArgs e)
        {
            img = pbShow.Image;

            int newWidth = (int)(img.Width * 1);
            int newHeight = (int)(img.Height * 1);

            img = resize.ResizeImage(new Size(newWidth, newHeight), img, true);
            SetImage2();
        }

        private void ts150_Click(object sender, EventArgs e)
        {
            img = pbShow.Image;

            int newWidth = (int)(img.Width * 1.5);
            int newHeight = (int)(img.Height * 1.5);

            img = resize.ResizeImage(new Size(newWidth, newHeight), img, true);
            SetImage2();
        }

        private void ts200_Click(object sender, EventArgs e)
        {
            img = pbShow.Image;

            int newWidth = (int)(img.Width * 2);
            int newHeight = (int)(img.Height * 2);

            img = resize.ResizeImage(new Size(newWidth, newHeight), img, true);
            SetImage2();
        }

        private void ts300_Click(object sender, EventArgs e)
        {
            img = pbShow.Image;

            int newWidth = (int)(img.Width * 3);
            int newHeight = (int)(img.Height * 3);

            img = resize.ResizeImage(new Size(newWidth, newHeight), img, true);
            SetImage2();
        }

        private void ts500_Click(object sender, EventArgs e)
        {
            img = pbShow.Image;

            int newWidth = (int)(img.Width * 5);
            int newHeight = (int)(img.Height * 5);
            splitContainer1.Panel1.AutoScroll = true;
            img = resize.ResizeImage(new Size(newWidth, newHeight), img, true);
            SetImage2();
        }

        #endregion

private Bitmap bmap;

        public Image ResizeImage(Size size, Image image, bool preserveAspectRatio)
        {
            int newWidth, newHeight;

            if (preserveAspectRatio)
            {
                int origWidth = image.Width;
                int origHeight = image.Height;
                float percentWidth = (float)size.Width / (float)origWidth;
                float percentHeight = (float)size.Height / (float)origHeight;
                float percent = percentHeight < percentWidth ? percentHeight : percentWidth;

                newWidth = (int)(origWidth * percent);
                newHeight = (int)(origHeight * percent);
            }
            else
            {
                newHeight = size.Height;
                newWidth = size.Width;
            }

            Image newImg = new Bitmap(newWidth, newHeight);
            using (Graphics gfx = Graphics.FromImage(newImg))
            {
                gfx.InterpolationMode = InterpolationMode.HighQualityBicubic;
                gfx.DrawImage(image, 0, 0, newWidth, newHeight);
            }

            return newImg;
        }

        public Image reSize(int newWidth, int newHeight, Image img)
        {
            if (newWidth != 0 && newHeight != 0)
            {
                Bitmap temp = (Bitmap)img;
                bmap = new Bitmap(newWidth, newHeight, temp.PixelFormat);

                double nWidthFactor = (double)temp.Width / (double)newWidth;
                double nHeightFactor = (double)temp.Height / (double)newHeight;

                double fx, fy, nx, ny;
                int cx, cy, fr_x, fr_y;
                Color color1 = new Color();
                Color color2 = new Color();
                Color color3 = new Color();
                Color color4 = new Color();
                byte nRed, nGreen, nBlue;

                byte bp1, bp2;

                for (int x = 0; x < bmap.Width; ++x)
                {
                    for (int y = 0; y < bmap.Height; ++y)
                    {

                        fr_x = (int)Math.Floor(x * nWidthFactor);
                        fr_y = (int)Math.Floor(y * nHeightFactor);
                        cx = fr_x + 1;
                        if (cx >= temp.Width) cx = fr_x;
                        cy = fr_y + 1;
                        if (cy >= temp.Height) cy = fr_y;
                        fx = x * nWidthFactor - fr_x;
                        fy = y * nHeightFactor - fr_y;
                        nx = 1.0 - fx;
                        ny = 1.0 - fy;

                        color1 = temp.GetPixel(fr_x, fr_y);
                        color2 = temp.GetPixel(cx, fr_y);
                        color3 = temp.GetPixel(fr_x, cy);
                        color4 = temp.GetPixel(cx, cy);

                        // Blue
                        bp1 = (byte)(nx * color1.B + fx * color2.B);

                        bp2 = (byte)(nx * color3.B + fx * color4.B);

                        nBlue = (byte)(ny * (double)(bp1) + fy * (double)(bp2));

                        // Green
                        bp1 = (byte)(nx * color1.G + fx * color2.G);

                        bp2 = (byte)(nx * color3.G + fx * color4.G);

                        nGreen = (byte)(ny * (double)(bp1) + fy * (double)(bp2));

                        // Red
                        bp1 = (byte)(nx * color1.R + fx * color2.R);

                        bp2 = (byte)(nx * color3.R + fx * color4.R);

                        nRed = (byte)(ny * (double)(bp1) + fy * (double)(bp2));

                        bmap.SetPixel(x, y, System.Drawing.Color.FromArgb
                (255, nRed, nGreen, nBlue));
                    }
                }
                Graphics g = Graphics.FromImage((Image)bmap);

                g.CompositingMode = CompositingMode.SourceOver;
                g.CompositingQuality = CompositingQuality.HighQuality;

                if (newWidth >= img.Width && newHeight >= img.Height)
                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                else
                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;

                g.PixelOffsetMode = PixelOffsetMode.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;

                g.DrawImage(img, 0, 0, newWidth, newHeight);
                g.Dispose();
            }
            return (Bitmap)bmap;
        }