resize image

Posted on 2007-04-03
Last Modified: 2010-04-23

I have an image with size of 60x100
Now I want to resize it, so it is 100x100, but not resize the image itself. The image itself should still be 60x100, but with 20 pix on the left and 20 pix on the right, this space should be transparent...

How can I do that?

Question by:Ruttensoft
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LVL 86

Accepted Solution

Mike Tomlinson earned 500 total points
ID: 18844040
You can resize an image using code like this...

        Dim fileName As String = "c:\small.jpg"

        Dim fs As New System.IO.FileStream(fileName, IO.FileMode.Open)
        Dim img As Image = Image.FromStream(fs)

        Dim bmp As New Bitmap(100, 100)
        Dim g As Graphics = Graphics.FromImage(bmp)
        g.DrawImage(img, 20, 0)


        bmp.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg)

But I'm not sure about the Transparent color part.  =\

Author Comment

ID: 18847173

Thanks for the hint

It's interesting, it did not work initially, the bitmap was bigger on the new drawn image.
I've now changed from filestream to direkt Image.Fromfile, and this is working
        Dim fileName As String = "c:\Portrait.png"
        Dim img As Bitmap = New Bitmap(Image.FromFile(fileName))
        Dim bmp As New Bitmap(100, 100)
        Dim g As Graphics = Graphics.FromImage(bmp)
        g.DrawImage(img, 20, 0)
        bmp.Save("c:\Portraita.png", System.Drawing.Imaging.ImageFormat.Png)

Then saving to png, and the transparent is also working... by jpg not...

But thanks for the hint


LVL 86

Expert Comment

by:Mike Tomlinson
ID: 18847442
Ok...wonder why it was resizing the image in the original code?

Glad you figured out the rest though...  =)

Author Comment

ID: 18847451
Hm yeah I wonder too why that was not working... very strange... but yeah... it now works, thanks for your code, without I would not have figured it out...

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