vb.net - Save screenshot with reduced resolution and image quality - vb.net

Question

I am using this code to take screenshots on a production machine and save them to a folder. each file is about 400 kb in size, and I do not really need good resolution and quality. How can I half the resolution and reduce the jpg quality to save space?
Private Sub TakeScreenShot()
Dim screenSize As Size = New Size(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim screenGrab As New Bitmap(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim g As Graphics = Graphics.FromImage(screenGrab)
g.CopyFromScreen(New Point(0, 0), New Point(0, 0), screenSize)
screenGrab.Save("screenshots\test.jpg", Imaging.ImageFormat.Jpeg)
End Sub

Answer 1

Following this MSDN article, you can set 50% quality like this
Private Sub TakeScreenShot()
Dim screenSize As Size = New Size(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim screenGrab As New Bitmap(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim g As Graphics = Graphics.FromImage(screenGrab)
g.CopyFromScreen(New Point(0, 0), New Point(0, 0), screenSize)
Dim jpgEncoder As System.Drawing.Imaging.ImageCodecInfo = GetEncoder(System.Drawing.Imaging.ImageFormat.Jpeg)
Dim myEncoder As System.Drawing.Imaging.Encoder = System.Drawing.Imaging.Encoder.Quality
Dim myEncoderParameters As New Imaging.EncoderParameters(1)
Dim myEncoderParameter As New System.Drawing.Imaging.EncoderParameter(myEncoder, 50&)
myEncoderParameters.Param(0) = myEncoderParameter
screenGrab.Save("screenshots\test.jpg", jpgEncoder, myEncoderParameters)
End Sub
Public Function GetEncoder(ByVal format As ImageFormat) As ImageCodecInfo
Dim codecs As ImageCodecInfo() = ImageCodecInfo.GetImageDecoders()
Dim codec As ImageCodecInfo
For Each codec In codecs
If codec.FormatID = format.Guid Then
Return codec
End If
Next codec
Return Nothing
End Function