Fun With FantaMorph

I'm trying to make a sequenze, in which I make a Morphing, but I want another background , therefore I need a transparent background and not a black one. Tkank you

You should use 32-bit with alpha images. Click the link below to see the how-to article.
How to Use 32-bit with Alpha images

This is way late but...
Make sure you're picking MORPH TYPE as
Morph and Hold Image 1.
If the first image isn't held, there is no background
for the transparent areas in image 2, hence it will
be black.

Hope this helps.