I have been working on a rather elaborate (for an Mac newbie, anyway) movies of vacation photographs using iMovie. I have been using iMovie to create separate projects with the ultimate aim to have each represent a chapter on a DVD. Based on recommendations I've received somewhere, I selected "DV" as the format for the movies. Anyway, as I am nearing the end of my creative process I happened to glance at the file sizes of the iMovie projects. They are huge, between 1-4 GB. Obviously with around 10 "chapters", there's no way this is going to fit on a 4.7 GB DVD (unless I am missing something). Most of the photographs I used were high-resolution digitial photos (4-5 megapixels). Each chapter incorporates between 30-80 pictures and include Ken Burns was well as transitions. My questions are:  What has let to the huge size of the projects: the original photo size, the choice of "DV" format, or merely the number of photos used?  If these are then burned using iDVD, I assume it doesn't magically compress the iMovie projects to be able to fit on a DVD.  I am guessing I am hosed, since I know once you've started a project you cant change the format. (Guess that wasn't a statement).  So, assuming there is no way to rescue me from my bloated project, if I start from scratch what do I need to do to bring my files sizes down to reality? Thanks!