Check out Stephen Bullen's PastePicture workbook. This has code that till allow you to copy picture to clipboard and then save contents to bmp file.
http://www.oaltd.co.uk/Excel/Default.htm
You can use the following in conjuction to export images
Sub PictureExport()
Dim objIPicDisp As IPictureDisp
Dim objPic As Object
Dim strFile As String
For Each objPic In ActiveSheet.Pictures
strFile = ThisWorkbook.Path & Application.PathSeparator & objPic.TopLeftCell.EntireRow.Cells(1, 1).Value & ".bmp"
' copy picture
objPic.CopyPicture xlScreen, xlBitmap
'Retrieve the picture from the clipboard...
Set objIPicDisp = PastePicture(xlBitmap)
SavePicture objIPicDisp, strFile
Next
End Sub
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