No alpha channel without GnomeCanvasAA ?

[Jürgen Weinberger <gamsta gmx net>]

Could it be that the normal GnomeCanvas doesn't support the alpha
channel ?

I want to put an GnomeCanvasImage (with gnome_canvas_load_alpha) into a
normal canvas, this works but instead of an alpha channel it shows a
black boarder. If i try the same with an GnomeCanvasAA the alpha channel
works, but then my application gets to slow.

If anybody has an idea how i get an alpha channel into my program
without using the GnomeCanvasAA !! please HELP !!