How to Specify Images Converted through PDF in VB.NET?

Imports System.Drawing
Imports System.Drawing.Imaging
Imports PQScan.PDFToImage

Namespace SpecifyImageSize
  Class Program
    Private Shared Sub Main(args As String())
      ' Create an instance of PQScan.PDFToImage.PDFDocument object.
      Dim pdfDoc As New PDFDocument()

      ' Load PDF document.
      pdfDoc.LoadPDF("sample.pdf")

      ' Set dpi to render image
      pdfDoc.DPI = 96

      'Get total page count.
      Dim count As Integer = pdfDoc.PageCount

      For i As Integer = 0 To count - 1
        'Convert page to image in target size
        Dim bmp As Bitmap = pdfDoc.ToImage(i, 100, 200)
        'Save image 
        bmp.Save("output" & i & ".jpg", ImageFormat.Jpeg)
      Next
    End Sub
  End Class
End Namespace

Imports PQScan.PDFToImage

Namespace SpecifyImageSize
  Class Program
    Private Shared Sub Main(args As String())
      ' Create an instance of PQScan.PDFToImage.PDFDocument object.
      Dim pdfDoc As New PDFDocument()

      ' Load PDF document.
      pdfDoc.LoadPDF("sample.pdf")

      ' Set dpi to render whole image
      pdfDoc.DPI = 96

      ' Save multi-page tiff
      pdfDoc.ToMultiPageTiff("multipage.tiff")
    End Sub
  End Class
End Namespace