Normal AutoCAD can only show Trancparence on Bitonal Images or PNG Files (256 colors) with predefined (outside AutoCAD) Trancparency Color.
ATTENTION: Only If MAP Rasterextension is loaded (start an Map Images Command for Example MAPIINSERT)
you get additional Properties for Trancparency in Properties pallette.
Now yo can select an Color in the picture to swith to transparent view.
Works fine for me with MAP 2006 und 2007 using your example image.
BTW Convert the example image to a bitonal image if you only have colors black and white.
Udo Huebner
Gruß Udo Hübner (CAD-Huebner)