How to alter a clip progressively over time with iMovie 11

1. Find and cut



Find the clip you want to alter over time and add it to your project. Skim over it with the mouse until you're over the part you'd like the change to occur. Without moving the cursor, press the Shift+Command+S keys to activate the Split Clip tool, which cuts the clip into two at that very point.

2. All change

Double-click on one part of the clip to bring up the Inspector window. Select the Video tab and make your changes. You can also make use of the Video Effect menu in the Inspector's Clip tab to add a single effect to your clip (only one can be used at a time). You can alter your modifications at any time.

03. Transition

Go to Window > Transitions to reveal the Transitions panel, bottom-right of the interface (or use the Command+4 keyboard shortcut). Locate Cross Dissolve and drag it onto the gap between the clips. To change its length, double-click on it in your project and type in a new value in the Duration field.