Question

I have the following C# code (not mine) which pulls an image out of a database and displays it on a web page:

public partial class Image : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        getFullImage();
    }



    public void getFullImage()
    {
        SqlConnection objCon = new SqlConnection();
        objCon = new SqlConnection(Globals.ConnectionString);
        objCon.Open();

        String TmpStr;
        try
        {

            byte[] imgData = null;

            SqlCommand objCmd = new SqlCommand("Select * from Login where user_Name='" + Request["Id"].ToString() + "'", objCon);
            SqlDataReader reader = objCmd.ExecuteReader();


            while (reader.Read())
            {
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.AddHeader("Content-Disposition",
                    "attachment; filename=" + reader["ImageName"]);
                imgData = (byte[])reader["ImageFile"];
                TmpStr = reader["ImageFile"].ToString();
                TmpStr = TmpStr.Substring(1, TmpStr.Length - 1);
            }
            HttpContext.Current.Response.ContentType = "image/jpeg";
            HttpContext.Current.Response.BinaryWrite(imgData);
        }
        catch(Exception ex)
        {
            Response.Write(ex.Message.ToString());
        }
        finally
        {

        }
    }
}

I know it’s probably really bad practice to store images in a database and use them in this way, but I’m not a hardcore .NET dev and can’t rewrite this whole thing (much as I’d love to be able to!).

Anyhow, currently the method above creates full size (often huge) images, which are then resized using CSS, which causes them to degrade terribly in quality. I wondered if there was anything I could do to resize the image prior to render, so improve quality and reduce load time?

Thanks for any pointers folks…

Answer 1

Here are some good links/suggestions to high quality resizing of the images:

High Quality Image Scaling Library