How to superimpose two still photos

[jonnyD]

I'm making a slideshow and I want to superimpose two still photos so it gives a double-exposure effect (not just a transition between 2 pix, but a longer duration). Can I change the opacity of both stills to do this? Do they need to be on two different tracks?

[Peru]

Yes, put each on a different track and lower each opacity to 50% or keyframe the opacity as desired.

[jonnyD]

Ok, so I found out how to change opacity by putting the cursor in the middle of the video track and dragging to change the percentage of opacity.
What do you mean by:

or keyframe the opacity as desired.

I know how to keyframe movement; what is keyframing opacity?

[Steve Grisetti]

Keyframing means creating an animation so that one phone seems to dissolve into another. In other words, you're increasing one photo's opacity as you're decreasing the other's.

But if that's not your intention, you don't have to worry about it.

[Peru]

I don't have Vegas. I use Premiere Pro, so I can't give specific instructions, but I found this:
https://www.google.com/webhp?sourceid=c ... %20opacity