VB.NET Imaging - Convert PDF to Image Using VB

' Following APIs are designed to help users render PDF page to image collection
Private Function GetPage(pageIdx As Integer) As BasePage Implements PDFDocument.GetPage
End Function
Private Function toImage() As BaseImage Implements PDFPage.toImage
End Function
Private Function toImage(height As Integer, width As Integer) As BaseImage Implements PDFPage.toImage
End Function

' Use image saving API below to convert PDF to other image formats
Private Sub SaveImageFile(image As REImage, filePath As [String]) Implements REFile.SaveImageFile
End Sub

''' <summary>
''' To view, edit or save images of a pdf file, first generate REImage from a particular page of the document.
''' </summary>
''' <param name="doc"></param>
''' <returns></returns>
Public Function GetReImageForPDFDocument(doc As PDFDocument) As List(Of REImage)
	Dim imageList As New List(Of REImage)()
	For i As Integer = 0 To doc.GetPageCount() - 1
		Dim tmpPage As PDFPage = DirectCast(doc.GetPage(i), PDFPage)

		Dim tmpImage As REImage = DirectCast(tmpPage.ToImage(), REImage)

		imageList.Add(tmpImage)
	Next

	Return imageList
End Function

''' <summary>
''' You can transform REImage to TIFF image with following sample code
''' <param name="doc"></param>
Public Sub ConvertPDFToTIFF(doc As PDFDocument)
	Dim imageList As List(Of REImage) = GetReImageForPDFDocument(doc)
	Dim imgCount As Integer = 1

	For Each img As REImage In imageList
		REFile.SaveImageFile(img, "C:" & imgCount & ".tif", New TIFEncoder())
		imgCount += 1
	Next
End Sub