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i want to change the resolution of one uploaded image to small size .how to do this usng c#
if (fileUploadImage.HasFile)
 int fileSize = fileUploadImage.PostedFile.ContentLength;
 if (fileSize > Convert.ToInt32(ConfigurationManager.AppSettings["fileSize"]))
 lblUploadImage.Visible = true;
 String fileName = fileUploadImage.FileName.ToString();//Substring (0,fileUploadImage.FileName.IndexOf("."));
 string fileNameUrl = ConfigurationManager.AppSettings["imagepath"] + GenerateUniqueFileName(txtFname.Text, Path.GetExtension(fileName));
 Bitmap upBmp = (Bitmap)Bitmap.FromStream(fileUploadImage.PostedFile.InputStream);
Bitmap newBmp = new Bitmap(50,50, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
newBmp.SetResolution(72, 72);
 Graphics newGraphic = Graphics.FromImage(newBmp);
newGraphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
newGraphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
newGraphic.DrawImage(upBmp, 500, 100, 500, 100);
//Show the uploaded resized picture in the image control
imgProfile.Src = fileNameUrl;
lblUploadImage.Visible = true;
 catch(Exception exp)
 // fileUploadImage.SaveAs(Server.MapPath(fileNameUrl));
 // HiddenField1.Value = fileNameUrl;
 // imgProfile.Src = fileNameUrl;
 // lblUploadImage.Visible = false;
Posted 18-Sep-12 22:34pm
Edited 18-Sep-12 22:54pm
Legor at 19-Sep-12 3:49am
To less information, Please elaborate.
Sergey Alexandrovich Kryukov at 19-Sep-12 3:56am
I'm pretty much sure you don't need to change image resolution; it has little use. Most likely, you need to re-sample the image. Up or down? (Any considerable up-scale means louse quality...)
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Solution 1

You can have a look at the SetResolution-Method:[^]
But as Sergey mentioned what you probably want to do is a Downsampling of the image.
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Solution 2

Hello, you have a little mistake in your code, but it's so helpfully.
you must save the upBmp object and not the newBmp object.
Thank you so much!!

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