iMovie If you don’t like the way you’ve cropped or rotated a video clip or photo, or the way you’ve applied the Ken Burns effect, you can change the effect or restore the video or photo to its original state.
To reverse or make more changes to an image or video:
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Select the photo or video clip, and then press the C key or click the Crop button.
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Do any of the following in the viewer:
To change the image orientation, click the rotate buttons until you get the orientation you want.
To include the entire image in the frame regardless of its aspect ratio, click Fit.
To change a crop, click Crop, and then drag to reposition and resize the green crop rectangle.
To undo the Ken Burns effect, click Fit.
To change the Ken Burns effect, click Ken Burns, and then drag to reposition and resize the red and green crop rectangles.