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iMovie sets the duration of all the transitions in your project to the same length by default. To change that default duration, choose File > Project Properties, or press Command+J and then in the Timing section, drag the Transition Duration slider to set the length of the transitions. In the General section, you can also use the Automatically Add option and enjoy the additional simplicity of having iMovie add the selected transition between all the clips in your project. Now as mentioned in the previous lesson, most video editors avoid using too many transitions, favoring straight cuts between clips for the most part.
So this option isn't necessarily the best idea for the average project. But for projects like picture slideshows, adding transitions between every clip or photo might actually makes sense. You will see if you do select this option, you are asked whether to Overlap ends and shorten clips or Extend ends and maintain duration. Overlap ends and shorten clip means that it will bring some of the existing clips into the transition, so you won't see them entirely. Extend ends and maintain duration means that iMovie will add extra tail or leader to the clip to be used in a transition.
Now, if you specifically cropped out a part of the clip you didn't want at the start or the end of it, choosing Extend ends and maintain duration will actually bring back the unwanted section of the clip in the Transition region. So most of the time you want to choose Overlap ends and shorten clip. I'll leave this option deselected. Now to adjust the duration of transitions manually, move your mouse over a transition, double-click and choose a new duration in the slider.
To modify only the currently selected transition, deselect Applies to all transitions. For regular transitions, in other words, ones that aren't part of the current theme, you also have the option of changing the kind of transition. Just click and select a new transition from the menu that appears. Click Done when you are finished. You can then skim through and preview the result. (Music playing and crowd noises.) To make adjustments to the duration and type of multiple transitions at once, Command-click on several transitions and then click the Action menu of one and select Transition Adjustments.
Even where Applies to all transitions deselected, Duration changes here will affect all selected transitions. Likewise, changes to the Transition Type will also override the existing settings. (Music playing and crowd noises.)
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