The roto brush is not the most intuitive tool, including a lot of options that will quickly perplex intermediate users. In this video tutorial, I will show you how to get started rotoscoping with the roto brush, including how to use the tool, what results you can achieve with it, what footage to avoid, and best practices for shooting roto-able images in the future. Use the Refine Edge tool to paint over any complex edges, especially hair and other problematic areas.
To begin rotoscoping an image, first, open up a layer in the Layer panel. Now simply brush over an area of the image to select it. Option-drag to subtract areas from the selection. Once complete, this first selection will serve as your base frame.
In the layer panel, you can see a few controls at the bottom. This is your span, which will expand forward and backward from the base frame. You need to work on your image frame-by-frame, working outward from the base frame.
You can expand the span to cover a larger part of your work area and can add multiple base frames with corresponding spans. Next, use Page Up and Page Down to move a frame at a time.
With each frame, you will probably need to make slight adjustments with the roto brush. Be aware that areas with low contrast and motion blur may be particularly challenging when using the roto brush.
Again, rotoscoping is a tedious process, sometimes even when using a super handy roto brush. After Effects gives users several different view options to help with the selection. You can view the alpha as black and white, as a boundary, or as an overlay. Edit and keyframe these settings to achieve your desired result.
Apply your rotoscoped footage to your production. Now that you have an isolated subject, you can make many interesting effects in your production. By duplicating the original footage, you can create depth by having 3D particles appear to flow both in front and behind your subject, or you can completely move the subject into a different background as if the subject was filmed with a green screen — there are lots of special effects possibilities with rotoscoping.
Include your email address to get a message when this question is answered. Aim to skip ahead 3 frames at a time to be more efficient in your edits to the selection area. Helpful 0 Not Helpful 0. Duplicate the footage used for your rotoscope and put it in a different layer to make a mask of your subject to which effects can be applied. Enable alpha channel when rendering to make sure the rotoscoped subject does not have an unwanted background behind it.
Submit a Tip All tip submissions are carefully reviewed before being published. Be patient. Even though the Roto Brush tool is meant to expedite the process of rotoscoping, you should still be prepared to dedicate a considerable amount of time to your project.
The Roto Brush, when used in difficult footage, may require frequent selection edits. Pick the right tool. Some rotoscope projects will require a different rotoscoping method than the Roto Brush in AE, as the Roto Brush is a quick tool and not a precision instrument. Rotoscoping with the pen tool, hand tracing, or using a different rotoscoping software outside Adobe AE are a few alternatives. Related wikiHows How to.
How to. Co-authors: 2. Updated: May 6, Categories: Adobe Software. Thanks to all authors for creating a page that has been read 23, times.
Is this article up to date? When the View menu in the Layer panel is set to Roto Brush, a Freeze button appears in the lower-right corner of the Layer panel. Click this button to cache and lock segmentation for all Roto Brush spans for the layer within the composition work area. This preserves the matte and saves it with the project, preventing the Roto Brush effect from recalculating the segmentation when you open the project again or make changes.
For example, draw a stroke along the skeleton rather than along the outline of an arm. After Effects can then extrapolate from those regions to determine where the boundaries are. See Undo changes. Fast Previews modes are turned off when you draw a Roto Brush stroke. See Resolution.
Use the Roto Brush tool in a composition with a frame rate set to match the frame rate of the layer's source footage item.
A warning banner appears at the bottom of the frame in the Composition panel if the frame rate of the composition does not match the frame rate of the layer's source footage item.
See Frame rate. Legal Notices Online Privacy Policy. Buy now. Roto Brush and Refine Matte Search. After creating the segmentation boundary, use Refine Matte properties to improve the matte.
Roto Brush 2 Powered by Adobe Sensei. What's new in Roto Brush 2. Double click an existing layer in the Composition panel. This opens up the layer in the Layer panel. Select a frame to start from. Refine the selection. The magenta line that surrounds the object starts to get refined. Once the base frame is set, start the propagation. You can start propagation by: Pressing the spacebar - This triggers the propagation of the matte from the base frame to the new frame.
You can also propagate frame-by-frame either forward or backward, if you would like to go slower and evaluate the propagation more closely. This might be more ideal for footage which requires more correction strokes. Freeze the propagation. Freezing caching, locking, and saving Roto Brush segmentation. To unfreeze Roto Brush segmentation, click the Freeze button again. Adjusting and Refining the final matte. The result of the propagation can be further refined and improved via the controls in the "Roto Brush Matte" group in the Roto Brush effect, especially with the "Reduce Chatter" property.
Additionally, the Refine Edge Tool can be used for highly-detailed edges like hair and further controlled in the "Refine Edge Matte" property group. There are also options that compensate for motion blur and decontaminating edge colors. It is useful when dealing with mattes with soft edges or fine details like hair. Use the Refine Edge tool on other frames until the refinement is as precise and complete as possible. Modify properties in the Refine Edge Matte property group as needed.
Layer panel view options. Why should I use Roto Brush 1? Older projects that used Roto Brush should still open with Roto Brush 1. If you open a project created in v If you are not getting the desired line segmentation results with Roto Brush 2, try enabling classic controls. Doing so creates a hybrid approach, using the best of Roto Brush 2 and Roto Brush 1.
This is only available when Version is set to 2. In the version 1. Strokes, spans, and base frames. To manually change a span duration, drag either end of a span. To delete all spans, delete the instance of the Roto Brush effect. Propagation banner. Roto Brush tool, Roto Brush strokes, and similarities to paint tools and strokes.
Roto Brush effect and Refine Matte effect properties. Version: To select from the two Roto Brush versions - 1. Quality: Select the quality of detailing around the edges. Best is refined around edges. Any change to these properties requires a recalculation and propagation of the segmentation information from a base frame. Search Radius : The radius of the area within which After Effects searches when looking for pixels that match from one frame to the next.
You can change how the search radius adapts to regions with more or less motion using the Motion Threshold and Motion Damping properties. If the search radius is too small, some motion may be missed; if the search radius is too large, extraneous motion may be detected.
View Search Radius : When selected, displays a green box around the subject. It indicates where the Roto Brush algorithm is searching for the subject.
If the subject moves out of that frame, the Roto Brush effect is lost. You can increase the percentage to a higher number to cover the entire area. It is slower but more accurate and covers more area. If you're not getting the desired line segmentation results with Standard or Best , try enabling classic controls.
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