The photo track represents the flow of photos in your movie. Photos are connected by transitions. Each photo can have key frames which represent a particular cropping and view of the photo at a particular point in the timeline. The movie will connect the key frames as the movie plays and the resulting motion is called the motion path.
In the timeline, the blue lines represent motion paths and the orange lines represent transitions between the photos. The height of the blue lines represents the relative speed of motion at that particular time. When the blue line is down, there is no motion. When the blue line is up, there is motion. When the blue line is directed up or down, the motion is either speeding up or slowing down.
To work with the photo track
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Click under or on the blue lines to select the motion paths.
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Choose → or → to select the next or previous photo. You can also press Command-[ Ctrl-[ or Command-] Ctrl-] to accomplish the same thing.
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Choose → or press Delete to remove a motion path.
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Control-click or Right-click on a photo in the timeline to open it in another application or reveal its location in the Finder (Mac OS) or Explorer (Windows).
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Drag the ease points to change the ease positions (see Easing in and easing out of motion).
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Drag the control points to change durations(see Setting the duration of a motion path).
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Drag the entire motion path horizontally to change its transition time to other motion paths (see Setting duration of transitions).
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Drag the entire motion path vertically to drag and drop the motion path to a new position within the sequence of photos (see Editing the order of photos).
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Click on the orange lines between the overlapping portion of motion paths to select transitions.
You can adjust the duration of an entire photo track to match the length of your music (see Stretching the duration of a photo track).