Under visibility, there's set semi-transparency and change ink-effect. None of them seem to work, as 1 to 127 give 100% opacity.
You probably already learned that by yourself. The only solution I have would be to use the active picture object instead, creating and deleting backdrops. It just depends on what you need it for.
Yeah, I figured myself. Just hoped there was a workaround. Thanks anyway.
I'm going to use it for particles, so I could easily use an active object instead, it just would've been easier this way.