Currently Being ModeratedAug 4, 2011 6:32 AM (in response to SunshineLollipops)
You can do the Green Screen effects, but you will want to make sure you have the video shot against a green or blue background to get it to combine properly. Also you will want to turn on the Advanced Tools by going to iMovie Menu>Preferences>General Tab>Check the box listed as Show Advanced Tools
When you drag your video clips shot against the Green Screen over top of a video already on the Project timeline, you'll get a pop-up menu. On that menu will be the option for choosing Green Screen.
Currently Being ModeratedAug 5, 2011 1:20 PM (in response to elikness)
Thanks so much. i have just tried and it works. my videos will now be one step closer to being really cool!