![]() ![]() Once the shape of your mask has been keyframed, it should move around your subject throughout the footage without cutting them off. You may need to shift-click on a mask’s points to select it individually. Simply go through the footage and change the shape of the mask whenever your subject moves out of it. Under the mask properties in the timeline panel you will find “Mask Path.” If you turn keyframes on for this property, you can animate the shape of the mask by dragging its points. To avoid this, you can animate the shape of the mask. If this happens, the subject will be partly cut off. While you want to crop out as much as you can, if you draw your mask too close to the subject being keyed, they may move outside the mask during the clip. The more you can cut out, the less the program needs to color-key, and the better your results are likely to be. Use the pen tool to draw a rough mask around your subject, cutting out any unwanted sections. Once you have your clip imported into After Effects and placed in a composition, you the masking tools to trim out as much of the unwanted area of the frame as possible. Plus, it can be used in creative ways to combine live action footage with animation. While this doesn’t directly relate to the kind of work we’ve been doing, I think it’s a useful skill to have. One very common use for After Effects is compositing work – combining multiple pieces of footage, usually through the use of green or blue screen effects. We’ve been using After Effects to create animation throughout the semester, but it’s capable of a lot more. Here is some footage to use for this exercise.
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