Question

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

Asked by: endrec

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)

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

                                  
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Asked On
2009-08-28 at 10:18:10ID24690503
Tags

C#

,

VB.NET

,

GDI+

,

Set Resoltion

,

DPI

,

Image Resizing

,

GDI

,

.NET

Topics

.NET

,

Microsoft Visual Basic.Net

,

C# Programming Language

Participating Experts
1
Points
500
Comments
1

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Answers

 

by: TheLearnedOnePosted on 2009-08-28 at 10:40:42ID: 25209898

What are you passing in as DPI?  Did you try passing in 300?

You are setting the resolution on 'bmp', but referring to 'resizedimg'.  Did you try setting the resolution on 'resizedimg'?

20120131-EE-VQP-002

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