Does iMovie duplicate video

I am in the process of importing my holiday video's from iphoto and putting together a movie.  What I want to know is, am I able to delete the origanal movie from iphoto?  Does Imovie make a duplicate or do I have to keep the origanal?  Thanks for your help.

Hi
iMovie'09 and 11 have a Blue/Green screen feature. Some find it very good.
Drag a clip ontop of another clip in Project window and You see some choises
and one is "Blue/Green screen".
Other programs that can do this is
• FinalCut - a standard function - no need for extra plug-ins
• iMovie up to HD6 - BUT here You need to buy an extra Plug-in.
Yours Bengt W

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