After Effects Tutorial | Lesson 21 | Track Mattes: The Ultimate Reveal & Compositing Tool

🎭 Want to create stunning reveals, intricate text animations, and seamless composites? The secret is Track Mattes. Welcome to Lesson 21, where we master this fundamental compositing technique that uses the content of one layer to control the visibility of another. It's like a digital stencil, and it's one of the most powerful tools in your motion graphics arsenal.

In this definitive guide to Track Mattes, you'll learn:

✅ The Core Concept: How a Track Matte uses one layer's luminance or alpha to reveal another.
✅ The Four Types: Luma Matte, Luma Inverted, Alpha Matte, and Alpha Inverted.
✅ The #1 Rule: The layer order (the matte MUST be directly above the fill layer).
✅ How to Apply Them: Using the "TrkMat" column in the timeline.
✅ Animate Your Mattes: Use text, shapes, or video to create dynamic wipes, reveals, and transitions.
✅ Combine Techniques: Use Track Mattes with effects, precomps, and other layers for complex results.

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