Green screen on a still

Question

I saw this in the store but can't get the camera to capture and apply to a still picture. I know this is the green screen feature, but none of the help topics cover what I saw in the store - looked easy but not getting it.
-J

Answer 1

Maybe you guys have already solved this 'Photoshop to iMovie green screen technique' but if not, here's how I got it to work:
I did have to make a movie file to get the green screen technique to work; a single frame of a graphic over green did not work for me either.
I am using Photoshop CS4 Extended (with animation features).
I filled the Background with Pantone Green 354.
I created a second layer that contained my graphic.
I animated the position of the graphic from left to right and created a 60 frame movie.
I made certain that the last frame of my movie was just plain green without the graphic.
I exported my animation like this:
File-Export-Render Video...
QuickTime Export: QuickTime Movie
Click on Settings...
Click on Settings... again.
Choose Compression Type: Animation
Keyframes: Automatic
Compressor: Millions of Colors+
Quality: Best
I turned off Prepare for Internet Streaming
Click Render button.
I imported the movie into iMovie and used the green screen technique.
I also double clicked the green screen movie and made sure I checked on 'Subtract Last Frame'
Voila! Hope my description made sense.
(As mentioned, another way to composite a still (not animated) graphic over your video is to create your graphic over a transparent background. Save it as a PNG file. This will work with iMovie's Picture In Picture feature. A Targa TGA file did not work for me.)