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8.2

How To Set Resolution Of A Resized Image To 300 DPI Not The Montior's DPI in .NET GDI+?

Asked by endrec in .NET, Microsoft Visual Basic.Net, C# Programming Language

Tags: C#, VB.NET, GDI+, Set Resoltion, DPI, Image Resizing, GDI, .NET

I am having a problem with setting the resolution of a resized image to a DPI that is different than the monitor's DPI.  For some reason SetResolution(DPI, DPI) is not taking into account the resolution/DPI I pass into it...it's looking at the user's monitor's DPI (which is 96 DPI in most cases).

How do I resize an image and set the DPI to a value that I specify/want?

This is not working and according to a few Google seaches that I've done, I have not been able to find a solution that overcomes this GDI+ method issue.  Perhaps there is a different way to do that that I'm not aware of.

bmp.SetResolution(DPI, DPI) 
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Private Sub ResizeImage(ByVal OriginalFile As String, ByVal Width As Integer, ByVal Height As Integer, ByVal DPI As Integer, ByVal FileNamePrefix As String, ByVal DestinationFolder As String)
        Dim fileExt As String = cboOutputFileType.SelectedItem.ToString
        Dim strOutputType As System.Drawing.Imaging.ImageFormat = fncSaveImagesAs(cboOutputFileType.SelectedItem.ToString)
 
        Dim bmp As New Bitmap(OriginalFile)
        bmp.SetResolution(DPI, DPI)
 
        Dim resizedimg As New Bitmap(Width, Height)
        Dim g As Graphics = Graphics.FromImage(resizedimg)
        g.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic
 
        g.DrawImage(bmp, New Rectangle(0, 0, Width, Height), New Rectangle(0, 0, bmp.Width, _
bmp.Height), GraphicsUnit.Pixel)
        g.Dispose()
 
        'MsgBox(DestinationFolder & "\" & FileNamePrefix & Path.GetFileName(OriginalFile))
        If My.Computer.FileSystem.FileExists(DestinationFolder & "\" & FileNamePrefix & Path.GetFileNameWithoutExtension(OriginalFile) & fileExt) = True Then
            resizedimg.Save(DestinationFolder & "\" & FileNamePrefix & "2_" & Path.GetFileNameWithoutExtension(OriginalFile) & fileExt, strOutputType)
        Else
            resizedimg.Save(DestinationFolder & "\" & FileNamePrefix & Path.GetFileNameWithoutExtension(OriginalFile) & fileExt, strOutputType)
        End If
        bmp.Dispose()
        resizedimg.Dispose()
    End Sub
[+][-]08/28/09 10:40 AM, ID: 25209898Accepted Solution

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About this solution

Zones: .NET, Microsoft Visual Basic.Net, C# Programming Language
Tags: C#, VB.NET, GDI+, Set Resoltion, DPI, Image Resizing, GDI, .NET
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Solution Provided By: TheLearnedOne
Participating Experts: 1
Solution Grade: A
 
 
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