[X4U] iMovie problems

[Gerry Van Tol]

I recently bought a 20" iMac with 1GB RAM. I like to make small  
movies with still photo's, kind of like slide shows but a bit more  
advanced. My previous PC (Windows Movie maker) couldn't handle the  
size of my CANON EOS pictures. I thought my new Apple hardware could  
but to my consternation also iMovie decides to be very unstable. When  
my slideshow reaches 4GB, the program decides to stop and abandon  
spontaneously.  Cutting the slide show in smaller pieces brings  
another problem by combining them again into one movie via iDVD. Is  
there anybody out there who can give me some ideas how to solve this  
problem?
Thanx,

Gerry Van Tol