I have some troubles to figure out how to apply an alpha channel in PS9. I tried storing the alpha channel during saving without any luck. Then I applied the alpha mask straight to the layer and saved. Nothing happened either.
I had to use PS7 to make the latter work, this is highly annoying. PS9 however loads the alpha channel correctly unlike PS7 which generally ignores them. Useless... or maybe I'm doing it wrong, anyone got an idea?