- After Effects User Guide
- Beta releases
- Getting started
- Projects and compositions
- Importing footage
- Text and Graphics
- Motion Graphics
- Drawing, Painting, and Paths
- Overview of shape layers, paths, and vector graphics
- Paint tools: Brush, Clone Stamp, and Eraser
- Taper shape strokes
- Shape attributes, paint operations, and path operations for shape layers
- Use Offset Paths shape effect to alter shapes
- Creating shapes
- Create masks
- Remove objects from your videos with the Content-Aware Fill panel
- Roto Brush and Refine Matte
- Layers, Markers, and Camera
- Animation, Keyframes, Motion Tracking, and Keying
- Motion tracking
- Transparency and Compositing
- Adjusting color
- Effects and Animation Presets
- Effects and animation presets overview
- Effect list
- Simulation effects
- Stylize effects
- Audio effects
- Distort effects
- Perspective effects
- Channel effects
- Generate effects
- Transition effects
- The Rolling Shutter Repair effect
- Blur and Sharpen effects
- 3D Channel effects
- Utility effects
- Matte effects
- Noise and Grain effects
- Detail-preserving Upscale effect
- Obsolete effects
- Expressions and Automation
- Expression basics
- Understanding the expression language
- Using expression controls
- Editing expressions
- Expression errors
- Using the Expressions editor
- Use expressions to edit and access text properties
- Expression language reference
- Expression examples
- Immersive video, VR, and 3D
- Construct VR environments in After Effects
- Apply immersive video effects
- Compositing tools for VR/360 videos
- Tracking 3D camera movement
- Work in 3D Design Space
- 3D Transform Gizmos
- Do more with 3D animation
- Preview changes to 3D designs real time with the Mercury 3D engine
- Add responsive design to your graphics
- Views and Previews
- Rendering and Exporting
- Basics of rendering and exporting
- H.264 Encoding in After Effects
- Export an After Effects project as an Adobe Premiere Pro project
- Converting movies
- Multi-frame rendering
- Automated rendering and network rendering
- Rendering and exporting still images and still-image sequences
- Using the GoPro CineForm codec in After Effects
- Working with other applications
- Collaboration: Frame.io, and Team Projects
- Memory, storage, performance
- Knowledge Base
About Mask Reference
Use the new Mask Reference option to restrict the area of effects that is applied to a layer. The Mask Reference property is found under the Compositing Options under each effect in the Timeline panel.
Create a Mask Reference
Click the '+' sign under the Compositing Options in the Timeline panel and choose a mask from the Mask Reference menu.
While creating a mask reference, keep in mind the following considerations :
- You can only choose a mask on the same layer as the effect.
- You can add as many mask references as you like.
- You can reference an existing mask.
- You cannot create a new mask from an After Effects effect.
When a mask is applied to a layer, a dynamic stream is created under the Masks options which shows the list of masks applied to a layer. When a new mask is created, this list is automatically updated.
Changes to a mask that is referenced by an effect will change where the effect is composited. For example, you can feather the mask or use per-vertex feathering to change the edge of the effect composite. Changing the opacity changes the overall intensity of the effect per for every mask.
You can also use mask modes and combine multiple masks to apply an effect only to the area of intersection of masks.
For more information, see the Mask modes section.
Effect masks and layer masks
An effect mask cannot be used to modify the alpha channel of a layer. Hence an effect mask cannot be used as a layer mask.
For more information about layer masks, see the Masks and alpha channels section.
Watch this tutorial to learn how to limit an effect to a specific area using a mask on the layer, and change properties on a per-mask basis.