How to Use the Plugin Roto Brush in After Effects CS3

If you are looking for a way to separate a foreground object from a background in your video clips, you might want to try the Plugin Roto Brush in After Effects CS3. This tool uses artificial intelligence to track your subject’s movement and create a matte that isolates it from the rest of the scene. In this article, we will show you how to use the Plugin Roto Brush in After Effects CS3 and some tips and tricks to get the best results.

What is Plugin Roto Brush?

Plugin Roto Brush is a tool that allows you to draw strokes on representative areas of the foreground and background elements in your video clip. After Effects uses that information to create a segmentation boundary between the foreground and background elements. You can then refine the matte using the Refine Matte properties or the Refine Edge tool .

Plugin Roto Brush is powered by Adobe Sensei, which means it uses artificial intelligence to analyze your footage and track your subject’s movement. This can save you a lot of time and effort compared to traditional rotoscoping methods that use animated masks.

How to Use Plugin Roto Brush in After Effects CS3

To use Plugin Roto Brush in After Effects CS3, follow these steps:

1. Select the video layer in the Timeline panel and double-click it to open it in the Layer panel.
2. Select a frame to start from. Avoid frames where the object is hidden by other objects in the scene. For example, for a person walking in and out of frame, choose a frame where they are completely in the scene.
3. Select the Roto Brush tool from the Tools panel (Alt/Option + W) .
4. Paint a green foreground stroke on the subject, object, or region you are trying to roto. The object to be removed is outlined in magenta. Start with one stroke that cuts across the object. See what Roto Brush selects from that and use as few strokes as necessary to add or remove from the selection.
5. Press Alt/Option and paint over areas of a selection to remove those areas from the selection.
6. Change the duration of the span to set the duration for the Roto Brush. The span is indicated by a light grey chevron pattern on the Timeline panel. The base frame is a bright green box at the beginning of the span. You can drag the edges of the span to adjust its duration.
7. Press the Spacebar to start and stop the analysis, and make changes to the selection as needed. As you move through the frames, you will see green color chevrons display in the middle of the span to indicate that they have been propagated. You can use the 1 and 2 keys on your keyboard to move up and down the timeline a single frame at a time.
8. Adjust the Roto Brush Matte options in the Effect Controls panel to fine-tune the selection. You can adjust parameters such as Feather, Contrast, Shift Edge, Reduce Chatter, Motion Threshold, Motion Damping, etc.
9. Once you have a satisfactory Roto Brush selection, press the Freeze button in the Layer panel to save it. This will prevent any further changes to your selection.

You have now successfully used Plugin Roto Brush in After Effects CS3. You can now replace the background, apply effects to the foreground, or do anything else you want with your isolated element.

How to Use the Refine Edge Tool with Plugin Roto Brush

Sometimes, the Plugin Roto Brush may not be able to create a perfect matte for your subject, especially if it has fine details such as hair or fur. In that case, you can use the Refine Edge tool to improve the edges of your matte and make them more realistic .

The Refine Edge tool is a brush that you can use to paint over the edges of your matte and let After Effects analyze the alpha channel and color information of your footage to create a better edge. The Refine Edge tool also uses Adobe Sensei to track the edge movement across the frames.

To use the Refine Edge tool with Plugin Roto Brush in After Effects CS3, follow these steps:

1. After using Plugin Roto Brush and freezing your selection, select the Refine Edge tool from the Tools panel (Alt/Option + G) .
2. Paint over the edges of your matte that need refinement. You will see a thin purple line appear over the edge as you paint. You can adjust the brush size and hardness using the bracket keys on your keyboard.
3. Press the Spacebar to start and stop the analysis, and make changes to the edge as needed. You can use the 1 and 2 keys on your keyboard to move up and down the timeline a single frame at a time.
4. Adjust the Refine Edge Matte options in the Effect Controls panel to fine-tune the edge. You can adjust parameters such as Smooth, Feather, Contrast, Shift Edge, etc.
5. Once you have a satisfactory Refine Edge selection, press the Freeze button in the Layer panel to save it. This will prevent any further changes to your edge.

You have now successfully used the Refine Edge tool with Plugin Roto Brush in After Effects CS3. You can now enjoy a more realistic and believable matte for your subject.

How to Export Your Roto Brush and Refine Edge Matte

After using Plugin Roto Brush and Refine Edge tool to create a matte for your subject, you may want to export it as a separate file or use it in another composition. There are a few ways to do that in After Effects CS3.

One way is to use the Render Queue. To do that, follow these steps:

1. Select the video layer with the Roto Brush and Refine Edge effect in the Timeline panel and go to Composition > Add to Render Queue.
2. In the Render Queue panel, click on the Output Module settings and choose a format that supports alpha channels, such as QuickTime with Animation codec.
3. Click on the Channels menu and choose RGB + Alpha. This will render your video with transparency where the matte is.
4. Click on the Output To settings and choose a location and name for your file.
5. Click on the Render button to start rendering your file.

Another way is to use the Pre-compose function. To do that, follow these steps:

1. Select the video layer with the Roto Brush and Refine Edge effect in the Timeline panel and go to Layer > Pre-compose.
2. In the Pre-compose dialog box, choose a name for your pre-composition and make sure Move all attributes into the new composition is selected.
3. Click OK to create a new composition with your video layer and its effects.
4. You can now use this pre-composition as a source for another composition or export it as a file using the Render Queue method described above.

You have now successfully exported your Roto Brush and Refine Edge matte in After Effects CS3. You can now use it for further editing or compositing in other applications.

How to Use Plugin Roto Brush with Other Effects

One of the advantages of using Plugin Roto Brush in After Effects CS3 is that you can apply other effects to your foreground or background elements separately. For example, you can change the color, add blur, or apply a stylized effect to your subject or the background.

To use Plugin Roto Brush with other effects in After Effects CS3, follow these steps:

1. After using Plugin Roto Brush and freezing your selection, go to the Timeline panel and click on the Toggle Switches/Modes button at the bottom.
2. This will reveal the Track Matte options for each layer. Select the layer that contains your background and set its Track Matte to Alpha Inverted Matte. This will make the background transparent where the matte is.
3. Select the layer that contains your foreground and set its Track Matte to None. This will make the foreground visible where the matte is.
4. You can now apply any effect to your foreground or background layer separately. For example, you can go to Effect > Color Correction > Hue/Saturation and adjust the hue of your foreground or background.

You have now successfully used Plugin Roto Brush with other effects in After Effects CS3. You can now create more creative and dynamic compositions with your isolated elements.

How to Use Plugin Roto Brush with Motion Tracking

Another useful feature of using Plugin Roto Brush in After Effects CS3 is that you can use motion tracking to attach other elements to your foreground or background elements. For example, you can add text, graphics, or even another video clip to your subject or the background and make them move along with them.

To use Plugin Roto Brush with motion tracking in After Effects CS3, follow these steps:

1. After using Plugin Roto Brush and freezing your selection, select the layer that contains your foreground or background element and go to Animation > Track Motion.
2. In the Layer panel, move the track point to a feature that is visible and consistent throughout the frames. For example, you can choose an eye, a nose, or a corner of a building.
3. Click on the Analyze Forward button to start tracking the motion of your feature. You can adjust the track point size and search region as needed.
4. After tracking the motion, click on Edit Target and choose the layer that you want to attach to your tracked element. For example, you can choose a text layer, a shape layer, or another video layer.
5. Click on Apply and choose X and Y dimensions. This will apply the motion data to your target layer.

You have now successfully used Plugin Roto Brush with motion tracking in After Effects CS3. You can now add more elements to your composition and make them follow your tracked element.

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