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You can insert iMovie’s transition effects one by one, placing them between scenes only where appropriate, and hand-tailoring each one. That’s the way you add transitions in most programs, including the old iMovie.
But lurking one millimeter beneath iMovie’s surface at all times is its primary mission: letting you assemble edited video fast, automating everything. For that reason, iMovie ’11 also lets you turn on automatic, global transitions (great for slideshows!). The following sections cover both hand-crafted and automatic transitions.