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

Bhimashankar Gangade
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CompressImage (1).zip

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

<body>
<form id="form1" runat="server">
<div align="center">
<br />
Name:<asp:TextBox ID="txtname" runat="server"></asp:TextBox>
<br />
<br />
UploadImage :<asp:FileUpload ID="fileupload1" runat="server" />
<br />
<br />
<asp:Button ID="btnupload" runat="server" Text="Upload" OnClick="btnupload_Click" />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "false"
Font-Names = "Arial" >
<Columns>
<asp:BoundField DataField = "id" HeaderText = "ID" Visible="false" />
<asp:BoundField DataField = "Name" HeaderText = "Image Name" />
<asp:TemplateField>
<ItemTemplate>
<img src="<%#Eval("Content")%>" alt="<%#Eval("Name")%>" width="125px" height="150px"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</body>

Step 4 - This is the code for default.aspx.cs file.

public partial class Default : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString);
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGridView();
}
}
protected void btnupload_Click(object sender, EventArgs e)
{
string filename = Path.GetFileName(fileupload1.PostedFile.FileName);
string storedb = "Images/" + filename + "";
string targetPath = Server.MapPath("Images/" + filename);
Stream strm = fileupload1.PostedFile.InputStream;
var targetFile = targetPath;
ReduceImageSize(0.5, strm, targetFile);
//insert reduced size image in db
con.Open();
SqlCommand cmd = new SqlCommand("Insert into tblImageInfo(Name,Content)values('"+txtname.Text+"','"+storedb+"')", con);
cmd.ExecuteNonQuery();
}
protected void BindGridView()
{
DataTable dt = new DataTable();
string strQuery = "select * from tblImageInfo order by id desc";
SqlCommand cmd = new SqlCommand(strQuery);
SqlDataAdapter da = new SqlDataAdapter();
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
try
{
con.Open();
da.SelectCommand = cmd;
da.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
finally
{
con.Close();
da.Dispose();
con.Dispose();
}
}
private void ReduceImageSize(double scaleFactor, Stream sourcePath, string targetPath)
{
using (var image = System.Drawing.Image.FromStream(sourcePath))
{
var newWidth = (int)(image.Width * scaleFactor);
var newHeight = (int)(image.Height * scaleFactor);
var thumbnailImg = new Bitmap(newWidth, newHeight);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
thumbGraph.DrawImage(image, imageRectangle);
thumbnailImg.Save(targetPath, image.RawFormat);
}
}
}