Once you create the segmentation boundary in one frame, the boundary will move with the foreground object throughout the footage.В However, you may need to make adjustments to the boundary. There are ten in each direction of the base frame.В If you need to create a new base frame, go to the frame in the time ruler and define the segmentation boundary using the Roto Brush tool.ДЄll base frames are marked by gold rectangles in the time ruler. If you click the Toggle Alpha Boundary button ( ), you will see the outline again. If you click the Toggle Alpha Overlay button ( ), the foreground will be in color and the background will be red. The foreground is now white, and the background is black.В This makes the matte easier to see. When you are finished, click the Toggle Alpha button in the Layer panel.В It looks like this: Add red strokes to the areas you want to remove. If you accidentally have included some background in with the foreground, do not spend too much time trying to get it perfect.В Instead, press ALT to access the red background stroke brush. We have now created a segmentation boundary. These areas are in magenta.ДЄs you can see below, it did not recognize all of the man.Дraw another stroke.В We are going to do this stroke across his shoulders, followed by a stroke across each under-side of his leafy hat. When we release our mouse, we see the areas of the man that After Effects recognized based on our stroke. In the snapshot below, we drew a green stroke down the center of the man. WARNING: If you have ever extracted objects from Photoshop, do not worry.В This is a lot easier! To access the brushes, go to Window>Brushes.В You will then see the Brushes panel. Now start to add strokes to the foreground using the Roto Brush tool.В The foreground in our example is the man.В You can use broad strokes for larger areas, then smaller ones for the border. It looks like this:Дouble click the layer you want to work with to open it in the Layers panel.В The Layers panel is grouped with the Composition panel.

Next, go to the Tools panel and select the Roto Brush tool. The Roto Brush tool will be used to create strokes to a base frame that will distinguish the foreground from background.В The base frame will be used by After Effects to apply the Roto Brush tool to other frames. We are going to remove the man from this image below so we can adjust the color of the background without it affecting him. When you do that, After Effects will create a segmentation boundary between the background and the object you are removing. Make adjustments to the segmentation boundaryДЄs stated in the introduction to this section, rotoscoping is the process of removing an object from the background.В To do that, you use the Roto Brush tool to distinguish the item you want to remove from the background from the rest of the background. Use the Roto Brush tool to create a segmentation boundary

Rotoscoping is a process where you cut an object out of the background.В You can use rotoscoping to trace the path of an object, then use the path as a mask to remove it from the background.В Although you can accomplish the same thing by drawing masks and creating a matte, this is much more simple process.

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