How compress image without change the original height ,width of image in c#

Question

I want to make image size smaller then its original size.I am using following code for compress the size images but it increased the image size from 1MB to 1.5MB
Any Other solution for compress large size images without change image original height,width.

    public static byte[] CompressImage(Image img) {

            int originalwidth = img.Width, originalheight = img.Height;

            Bitmap bmpimage = new Bitmap(originalwidth, originalheight);

            Graphics gf = Graphics.FromImage(bmpimage);
            gf.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            gf.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.AssumeLinear;
            gf.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;

            Rectangle rect = new Rectangle(0, 0, originalwidth, originalheight);
            gf.DrawImage(img, rect, 0, 0, originalwidth, originalheight, GraphicsUnit.Pixel);

            byte[] imagearray;

            using (MemoryStream ms = new MemoryStream())
            {
                bmpimage.Save(ms, ImageFormat.Jpeg);
                imagearray= ms.ToArray();
            }

            return imagearray;
        }

Answer 1

You can set the quality level when you save the file as JPEG, which mostly also directly will correlate with file size - the less quality the smaller your output file will be.

Also see How to: Set JPEG Compression Level , for an example see this SO answer.