Solved

vb.net - resize images

Posted on 2013-06-13
1
354 Views
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

Open in new window

0
Comment
Question by:XK8ER
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 42

Accepted Solution

by:
sedgwick earned 500 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

Open in new window

from http://stackoverflow.com/questions/1940581/c-sharp-image-resizing-to-different-size-while-preserving-aspect-ratio
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question