Need to convert a Bitmap to DIB (system.intptr)

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VB

GDI

I need help converting a 1bpp windows Bitmap to a DIB IntPtr, but using the following code produces a DDB.

Dim bm As New Bitmap("C:\test.jpg")
  Dim hBitmap As System.IntPtr = bm.GetHbitmap
 ImgMod(hBitmap, 27) ' Third party Function looking for a IntPtr to a DIB 

Currently the ImgMod function is complaining that the handle is a DDB instead of a DIB.

Any Ideas?