Thumbnail problem

Question

User1139976008 posted

Hi,

I want to create thumbnail image for my asp.net website on the fly. Following code works for me except some images which are around 2000 X 4000 px in size. 

 

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim Originalimg As System.Drawing.Image
        Dim thumb As System.Drawing.Image
        Dim FileName As String
        Dim inp As IntPtr
        Dim width, height As Integer
        Dim width1, height1 As Integer
        Dim rootpath As String
        Dim p As Double

            Dim extn As String = ""
           
        rootpath = Server.MapPath(".")
        FileName = rootpath & "/" & Request.QueryString("FileName")
        Try
                Originalimg = System.Drawing.Image.FromFile(FileName, True)
          

            Catch ex As Exception

                Originalimg = System.Drawing.Image.FromFile(rootpath & "error.gif")
                'MsgBox(ex.ToString())
                Response.Write(ex.ToString())
            End Try

        If Not Request.QueryString("width") = Nothing Then

                width1 = Originalimg.Width
                height1 = Originalimg.Height

                Dim w2 As Decimal, h2 As Decimal
                Dim wper As Decimal, hper As Decimal, res As Decimal
                w2 = 150
                h2 = 110
   
                If width1 <= w2 AndAlso height1 <= h2 Then
                    width = width1
                    height = height1
                    'it = True
                End If
                If width1 > w2 OrElse height1 > h2 Then
                    'If (width1 > height1) Then
                    wper = (w2 / width1) * 100
                    hper = (h2 / height1) * 100
                    If wper < hper Then
                        res = wper
                    Else
                        res = hper
                    End If
                    width = width1 * (res / 100)
                    height = height1 * (res / 100)
                       
                End If
                       
            End If

            thumb = Originalimg.GetThumbnailImage(width, height, Nothing, inp)

            Response.ContentType = "image/jpeg"
            thumb.Save(Response.OutputStream, Imaging.ImageFormat.Jpeg)

            Originalimg.Dispose()
            thumb.Dispose()
          

        End Sub

Answer 1

User-925286913 posted

What is the actual problem/error? 

Answer 2

User1139976008 posted

Hi,

Thank you for reply. Problem is that I want to create thumbnail of image on the fly. So I used Syste.Drawing.Image.FromFile in my code. But when I pass image with large dimension like 2500 X 3000 to this code, then problem occurs. Thumbnail image doesnot get created.

Answer 3

User1211441112 posted

using System.Drawing;
using System.Drawing.Drawing2D;

        public void ResizeStream(int imageSize, Stream filePath, string outputPath)
        {
            var image = Image.FromStream(filePath);

            int thumbnailSize = imageSize;
            int newWidth, newHeight;

            if (image.Width > image.Height)
            {
                newWidth = thumbnailSize;
                newHeight = image.Height * thumbnailSize / image.Width;
            }
            else
            {
                newWidth = image.Width * thumbnailSize / image.Height;
                newHeight = thumbnailSize;
            }

            var thumbnailBitmap = new Bitmap(newWidth, newHeight);

            var thumbnailGraph = Graphics.FromImage(thumbnailBitmap);
            thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
            thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
            thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;

            var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
            thumbnailGraph.DrawImage(image, imageRectangle);

            thumbnailBitmap.Save(outputPath, image.RawFormat);
            thumbnailGraph.Dispose();
            thumbnailBitmap.Dispose();
            image.Dispose();
        }

then call resize image function as

ResizeImage(400, File1.FileContent, path);