Post
Ask Question

How To Compress Large Size Image Without Losing Image Quality Using ASP.NET

SQL Database

  • Create Database Sample
  • Create Table

You can create a table using the following query -  

create table tblImageInfo(id int identity(1,1) primary key,Name nvarchar(30),Content nvarchar(200));
 
Now, let's go ahead and start the process of compressing the images.

Step 1 - Open Visual Studio -> select New Project -> select Empty ASP.NET Web application

Step 2 - Create a folder named Images. 

Step 3 - Here is the code for Default.aspx page.

output
  1. <body>  
  2.     <form id="form1" runat="server">  
  3.     <div align="center">  
  4.         <br />  
  5.         Name:<asp:TextBox ID="txtname" runat="server"></asp:TextBox>  
  6.         <br />  
  7.         <br />  
  8.         
  9.     UploadImage :<asp:FileUpload ID="fileupload1" runat="server" />  
  10.         <br />  
  11.         <br />  
  12. <asp:Button ID="btnupload" runat="server" Text="Upload" OnClick="btnupload_Click"  />  
  13.          <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "false"  
  14.        Font-Names = "Arial" >  
  15.     <Columns>  
  16.        <asp:BoundField DataField = "id" HeaderText = "ID" Visible="false" />  
  17.        <asp:BoundField DataField = "Name" HeaderText = "Image Name" />  
  18.        <asp:TemplateField>  
  19.            <ItemTemplate>  
  20.                <img src="<%#Eval("Content")%>" alt="<%#Eval("Name")%>" width="125px" height="150px"/>  
  21.            </ItemTemplate>  
  22.        </asp:TemplateField>  
  23.     </Columns>  
  24.     </asp:GridView>  
  25.   
  26.           
  27.     </div>  
  28.     </form>  
  29. </body>  
Step 4 - This is the code for default.aspx.cs file.
  1. public partial class Default : System.Web.UI.Page  
  2.   {  
  3.       SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString);  
  4.       protected void Page_Load(object sender, EventArgs e)  
  5.       {  
  6.           if (!IsPostBack)  
  7.           {  
  8.               BindGridView();  
  9.           }  
  10.       }  
  11.   
  12.       protected void btnupload_Click(object sender, EventArgs e)  
  13.       {  
  14.           string filename = Path.GetFileName(fileupload1.PostedFile.FileName);  
  15.           string storedb = "Images/" + filename + "";  
  16.           string targetPath = Server.MapPath("Images/" + filename);  
  17.           Stream strm = fileupload1.PostedFile.InputStream;  
  18.           var targetFile = targetPath;  
  19.             
  20.           ReduceImageSize(0.5, strm, targetFile);  
  21.           //insert reduced size image in db  
  22.           con.Open();  
  23.           SqlCommand cmd = new SqlCommand("Insert into tblImageInfo(Name,Content)values('"+txtname.Text+"','"+storedb+"')", con);  
  24.           cmd.ExecuteNonQuery();  
  25.   
  26.       }  
  27.   
  28.       protected void BindGridView()  
  29.       {  
  30.           DataTable dt = new DataTable();             
  31.           string strQuery = "select * from tblImageInfo order by id desc";  
  32.           SqlCommand cmd = new SqlCommand(strQuery);              
  33.           SqlDataAdapter da = new SqlDataAdapter();  
  34.           cmd.CommandType = CommandType.Text;  
  35.           cmd.Connection = con;  
  36.           try  
  37.           {  
  38.               con.Open();  
  39.               da.SelectCommand = cmd;  
  40.               da.Fill(dt);  
  41.               GridView1.DataSource = dt;  
  42.               GridView1.DataBind();  
  43.           }  
  44.           catch (Exception ex)  
  45.           {  
  46.               Response.Write(ex.Message);  
  47.           }  
  48.           finally  
  49.           {  
  50.               con.Close();  
  51.               da.Dispose();  
  52.               con.Dispose();  
  53.           }  
  54.   
  55.       }  
  56.       private void ReduceImageSize(double scaleFactor, Stream sourcePath, string targetPath)  
  57.       {  
  58.           using (var image = System.Drawing.Image.FromStream(sourcePath))  
  59.           {  
  60.               var newWidth = (int)(image.Width * scaleFactor);  
  61.               var newHeight = (int)(image.Height * scaleFactor);  
  62.               var thumbnailImg = new Bitmap(newWidth, newHeight);  
  63.               var thumbGraph = Graphics.FromImage(thumbnailImg);  
  64.               thumbGraph.CompositingQuality = CompositingQuality.HighQuality;  
  65.               thumbGraph.SmoothingMode = SmoothingMode.HighQuality;  
  66.               thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;  
  67.               var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);  
  68.               thumbGraph.DrawImage(image, imageRectangle);  
  69.               thumbnailImg.Save(targetPath, image.RawFormat);  
  70.           }  
  71.       }  
  72.   }  
Step 5 - Build and run the application. Upload uncompressed images and get the compressed ones. You can check the image size.
application
Next Recommended Reading How To Crop Image And Save Image In ASP.NET Using jQuery