Image resizing and decreasing the image resolution

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I have a webform contains a file upload control and a button, when uploading the image I want to resize it and decrease its physical size (in KB).

I use a method that Do the resizing but the image size still big, i tried to decrease the resolution using

C#

Bitmap.SetResolution( , )

but it didn't affect the size of the image in KB

Here's my aspx code:

ASP.NET

<body>
    <form id="form1" runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
    </div>
    </form>
</body>

and Here's the code behind:

C#

protected void Button1_Click(object sender, EventArgs e)
{
    if (FileUpload1.HasFile)
    {
        int Image_Width = 830;
        int Image_Height = 430;
        string ImageName = "f_" + DateTime.Now.Millisecond + DateTime.Now.DayOfYear + DateTime.Now.Minute + DateTime.Now.Hour;
        HttpPostedFile pf = FileUpload1.PostedFile;
        ImageName += Path.GetExtension(pf.FileName);
        System.Drawing.Image bm_Large = System.Drawing.Image.FromStream(pf.InputStream);
        bm_Large = ResizeBitmap((Bitmap)bm_Large, Image_Width, Image_Height);
        string pathToSave_Large = Server.MapPath("~/images/Test Ajax/" + ImageName);
        bm_Large.Save(pathToSave_Large);
        FileUpload1.PostedFile.InputStream.Close();
    }
}

public static Bitmap ResizeBitmap(Bitmap b, int nWidth, int nHeight)
{
    Bitmap result = new Bitmap(nWidth, nHeight);
    using (Graphics g = Graphics.FromImage((System.Drawing.Image)result))
        g.DrawImage(b, 0, 0, nWidth, nHeight);
    //result.SetResolution(30, 30);
    return result;
}

Posted 5-Aug-13 0:14am

Hend Riad

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lukeer · Answer 1 · 2013-08-05T02:09:00

Solution 1

Tis site's seach would surely have returned a reference here[^].
But anyway: have a look at Bitmap's Save overloads[^]. You can compress a bitmap, if size matters (and you're going to lose image quality, though).

Posted 5-Aug-13 2:09am

lukeer

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2013-08-05T04:15:00

Refer - how to resize image without losing image quality or how to reduce image file size without losing quality using asp.net[^].

Quote:
After run my application I upload above pic to resize after completion process my pic size reduces drastically to 218 KB do you believe this but it’s true we can reduce image size as much as possible by using above code without losing quality of image and my image quality same as original one check it