How to reduce PDF images size with iTextSharp in VB.net

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VB

itextsharp

Hi guys,
i need to open a pdf file and reduce size!

I wrote this code:

Dim pdfFile As String = "D:\pdf\1.pdf"
Dim reader As New PdfReader(pdfFile)
Dim stamper As New PdfStamper(reader, New FileStream("D:\pdf\1c.pdf", FileMode.Create), PdfWriter.VERSION_1_5)

Document.Compress = True

stamper.FormFlattening = True
stamper.SetFullCompression()

stamper.Close()

But i obtain a new pdf file with same size of original.

Should i compress images in pdf? In case how to do this?

Thanks a lot!
Alex