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vb.net - resize images

Posted on 2013-06-13
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Last Modified: 2013-06-13
hello there,
I am using this code to re-size small images into a bigger size.
the Issue that I am having is that it stretches the images and I would like to re-size but keep the aspect ratio so that it doesn't stretch out.. how can I do this?

    Public Sub ResizeImage(ByVal fileName As String, ByVal width As Integer, height As Integer)
        Dim bm As New Bitmap(fileName)

        Dim thumb As New Bitmap(width, height)
        Dim g As Graphics = Graphics.FromImage(thumb)

        g.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic
        g.DrawImage(bm, New Rectangle(0, 0, width, height), New Rectangle(0, 0, bm.Width, bm.Height), GraphicsUnit.Pixel)
        g.Dispose()
        bm.Dispose()

        thumb.Save(fileName & "new.jpg", System.Drawing.Imaging.ImageFormat.Jpeg)
        thumb.Dispose()

    End Sub

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Question by:XK8ER
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Meir Rivkin earned 2000 total points
ID: 39243744
Public Sub FixedSize(fileName As String, Width As Integer, Height As Integer) As Image
	Dim imgPhoto As Image = Image.FromFile(fileName)
	Dim sourceWidth As Integer = imgPhoto.Width
	Dim sourceHeight As Integer = imgPhoto.Height
	Dim sourceX As Integer = 0
	Dim sourceY As Integer = 0
	Dim destX As Integer = 0
	Dim destY As Integer = 0

	Dim nPercent As Single = 0
	Dim nPercentW As Single = 0
	Dim nPercentH As Single = 0

	nPercentW = (CSng(Width) / CSng(sourceWidth))
	nPercentH = (CSng(Height) / CSng(sourceHeight))
	If nPercentH < nPercentW Then
		nPercent = nPercentH
		destX = System.Convert.ToInt16((Width - (sourceWidth * nPercent)) / 2)
	Else
		nPercent = nPercentW
		destY = System.Convert.ToInt16((Height - (sourceHeight * nPercent)) / 2)
	End If

	Dim destWidth As Integer = CInt(Math.Truncate(sourceWidth * nPercent))
	Dim destHeight As Integer = CInt(Math.Truncate(sourceHeight * nPercent))

	Dim bmPhoto As New Bitmap(Width, Height, PixelFormat.Format24bppRgb)
	bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution)

	Dim grPhoto As Graphics = Graphics.FromImage(bmPhoto)
	grPhoto.Clear(Color.Red)
	grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic

	grPhoto.DrawImage(imgPhoto, New Rectangle(destX, destY, destWidth, destHeight), New Rectangle(sourceX, sourceY, sourceWidth, sourceHeight), GraphicsUnit.Pixel)

	grPhoto.Dispose()
	bmPhoto.Save(fileName)
End Function

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from http://stackoverflow.com/questions/1940581/c-sharp-image-resizing-to-different-size-while-preserving-aspect-ratio
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