Compositing and transparency overview and resources

  1. After Effects User Guide
  2. Beta releases
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    8. Remove objects from your videos with the Content-Aware Fill panel
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  10. Animation, keyframing, motion tracking, and keying
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    4. Keying
      1. Keying
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  11. Transparency and compositing
    1. Compositing and transparency overview and resources
    2. Alpha channels, masks, and mattes
  12. Adjusting color
    1. Color basics
    2. Use the Adobe Color Themes extension
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  14. Expressions and automation
    1. Expression
      1. Expression basics
      2. Understanding the expression language
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      4. Syntax differences between the JavaScript and Legacy ExtendScript expression engines
      5. Editing expressions
      6. Expression errors
      7. Using the Expressions editor
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  15. Immersive video, VR, and 3D
    1. Construct VR environments in After Effects
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    7. Add responsive design to your graphics 
  16. Views and previews
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    3. Converting movies
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  18. Working with other applications
    1. Dynamic Link and After Effects
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    5. Share and manage changes with Team Project collaborators
    6. Creative Cloud Libraries in After Effects
    7. Plug-ins
    8. CINEMA 4D and Cineware
  19. Memory, storage, performance
    1. Memory and storage
    2. Improve performance
    3. Preferences
    4. GPU and GPU driver requirements for After Effects

Compositing overview

To create a composite from multiple images, you can make parts of one or more of the images transparent so that other images can show through. You can make portions of a layer transparent using any of several features in After Effects, including the following:

To make an entire layer uniformly transparent or semi-transparent, modify its Opacity property.

Layers can also be composited together without modifying the transparency of the layers themselves. For example, you can use blending modes or some of the Channel effects to blend image data from multiple layers into a composite. (See Blending modes and layer styles and Channel effects.)

After Effects also includes the mocha shape for After Effects (mocha shape AE) plug-in, which converts paths from mocha-AE into mattes in After Effects. (See Resources for Imagineer mocha shape for After Effects.)

Adobe Photoshop is an excellent application for performing many compositing tasks, including defining areas of transparency using its selection and painting tools. You can use Adobe Photoshop together with After Effects for optimum efficiency and best results when doing compositing work.

Online resources for compositing

Mark Christiansen provides a detailed overview of compositing—covering masks, mattes, blending modes, and alpha channels—in a chapter from his After Effects Studio Techniques book posted on the Adobe Press website.

Chris and Trish Meyer provide a tutorial on the Artbeats website that demonstrates how to create a light wrap, so that a foreground element blends in more convincingly with a background.

Rich Young collects tutorials and resources for creating light wraps on the After Effects Portal website.

Rich Young collects resources and tutorials for various methods of creating vignettes.

Chris Zwar provides tips on color keying and compositing on his website.

Jeff Foster provides free sample chapters from his book The Green Screen Handbook: Real World Production Techniques. The sample chapters cover basic compositing, color keying, garbage mattes, hold-out mattes, and how to avoid common problems with greenscreen shots. For more information, see Todd Kopriva's blog.

Compositing fire, explosions, muzzle flashes

Mark Christiansen provides tips and detailed techniques for creating and compositing fire, explosions, muzzle flashes, bullet hits, and energy blasts in the “Pyrotechnics: Creating Fire, Explosions, and Energy Phenomena in After Effects” chapter of After Effects Studio Techniques on the Peachpit Press website.

Compositing fog, smoke, and clouds

Mark Christiansen provides tips and detailed techniques for creating and compositing fog, smoke, mist, rain, and snow in the “Climate: Air, Water, Smoke, Clouds in After Effects” chapter of After Effects Studio Techniques on the Peachpit Press website.

Daniel Broadway provides tips for compositing fog or mist into a scene on his website.

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