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Asked: 2026-06-14T07:17:21+00:00

Background I have an ASP.NET web application with a VB.NET back end. In this

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Background
I have an ASP.NET web application with a VB.NET back end. In this application users can create payment requests which must be approved by a manager before they are sent to accounts payable for further processing. Within my request page (the page where the user enters the request information) I have a button that links to a separate .aspx page which provides a print preview of the request. When the request is approved by all of the required approvers, I have a VB.NET function that contains a WebBrowser object that navigates to the print preview page behind the scenes and takes a snap shot of it, then saves it as a .tiff file to an internal file share which is then picked up by a internal process and imported into another internal application called OnBase to go through processing for accounts payable.

The Problem
My problem is that when the my function takes the snap shot of the print preview page, the saved tiff has a lower resolution than desired. In other words, it looks kind of crappy when it is viewed through OnBase and when it is printed out.

The Question
How do I increase the resolution of the generated .tiff file at the time that the snapshot of the webpage is generated?

The Code

    Private Sub CaptureWebPage()
    Try
        Dim tiffFileName As String
        tiffFileName = OnBasePath & "CheckRequest_" & CurrentRequestId & ".tiff"

        Dim impersonateCode As New AliasAccount("TheUsername", "ThePassword")
        impersonateCode.BeginImpersonation()

        Dim browser As Windows.Forms.WebBrowser = New Windows.Forms.WebBrowser
        browser.ScrollBarsEnabled = False
        browser.ScriptErrorsSuppressed = True
        browser.Navigate(OnBasePath & htmlFileName)

        While browser.ReadyState <> Windows.Forms.WebBrowserReadyState.Complete
            System.Windows.Forms.Application.DoEvents()
        End While

        System.Threading.Thread.Sleep(1500)
        browser.ClientSize = New Size(950, 768)
        Dim Height As Integer = browser.Document.Body.ScrollRectangle.Bottom
        browser.ClientSize = New Size(950, Height)
        Dim bmp As Bitmap = New Bitmap(browser.Bounds.Width, Height)

        browser.DrawToBitmap(bmp, browser.Bounds)

        If File.Exists(tiffFileName) Then
            File.Delete(tiffFileName)
        End If

        If File.Exists(OnBasePath & htmlFileName) Then
            File.Delete(OnBasePath & htmlFileName)
        End If

        bmp.Save(tiffFileName.ToString(), ImageFormat.Tiff)
        bmp.Dispose()

        impersonateCode.EndImpersonation()

    Catch ex As Exception
        Throw
    End Try
End Sub

Additional Information
I have tried to use the .SetResolution method of my bitmap object, but it doesn’t actually change the resolution of the generated .tiff file. I have tried to Google this numerous times find a solution, but haven’t found anything useful.

Thanks In Advance

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1 Answer

  1. Editorial Team

    Screen “resolution” is much lower than print “resolution”. Typically desktop monitors are around 100ppi, where a normal printer on a desk might be 600dpi.

    The only suggestion I have for getting a higher resolution rendering of the web page would be configure what is grabbing the screenshot to use a resolution 3x what you are using now, and then set its zoom to 300%. Text elements and vector graphics will be rendered smoothly. Images will still be their web resolutions, and you may even lose image quality through interpolation when sizing up.

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