This is the most common part to add an image / signature in any web/Windows applications. This article will show you how to resize an image keeping with the best graphics quality.
Most of the time, developers face various problems when they resize an image runtime. In this article, I try to resize an image runtime with keeping the best graphics quality.
Here I write a function to resize an image (i.e., “ImageResize”), this function has four input parameters that are:
strImageSrcPath: A string that contains the image source file pathstrImageDesPath: A string that contains the destination file pathintWidth: An integer value for the new image widthintHeight : An integer value for the new image HeightAfter successfully calling the function with the valid input values, it will resize and store the image into your given destination path and return the full path to show the new resized image. Here I use .NET framework 3.5 (System.Drawing,IO) namespaces.
Public Function ImageResize(ByVal strImageSrcPath As String _
, ByVal strImageDesPath As String _
, Optional ByVal intWidth As Integer = 0 _
, Optional ByVal intHeight As Integer = 0) As String
If System.IO.File.Exists(strImageSrcPath) = False Then Exit Function
Dim objImage As System.Drawing.Image = System.Drawing.Image.FromFile(strImageSrcPath)
If intWidth > objImage.Width Then intWidth = objImage.Width
If intHeight > objImage.Height Then intHeight = objImage.Height
If intWidth = 0 And intHeight = 0 Then
intWidth = objImage.Width
intHeight = objImage.Height
ElseIf intHeight = 0 And intWidth <> 0 Then
intHeight = Fix(objImage.Height * intWidth / objImage.Width)
ElseIf intWidth = 0 And intHeight <> 0 Then
intWidth = Fix(objImage.Width * intHeight / objImage.Height)
End If
Dim imgOutput As New Bitmap(objImage, intWidth, intHeight)
Dim imgFormat = objImage.RawFormat
objImage.Dispose()
objImage = Nothing
If strImageSrcPath = strImageDesPath Then System.IO.File.Delete(strImageSrcPath)
' send the resized image to the viewer
imgOutput.Save(strImageDesPath, imgFormat)
imgOutput.Dispose()
Return strImageDesPath
End Function
Now we are going to discuss how the above function works. Here, you will find various methods to perform file manipulation and all these are common. I would like to highlight the main properties, methods and class that are used for image resizing.
RawFormat: Gets the file format of this imageFromFile: Creates an Image from the specified fileFix: Returns integer form fraction valuesEncapsulates a GDI+ bitmap, which consists of the pixel data for a graphics image and its attributes. A Bitmap is an object used to work with images defined by pixel data.
The concept is very simple, at first we need to create an instance of System.Drawing.Image.FromFile and set the new width and height of the image. After that, we use Bitmap object to populate the new image and set the actual format by using RawFormat property and finally store the new image into the destination path.
This is a very simple and easy way. I hope that it might be helpful to you. Enjoy!
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