Creating Track Mattes

I can create a track matte in After Effects to reveal or hide parts of a layer.

7:26

We don't generate video — this one is by Ayudh Creations on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

1. 1

   In After Effects, the alpha channel determines the opacity of a layer, where white indicates complete opacity, black indicates complete transparency, and shades of gray indicate partial transparency.

2. 2

   When using Alpha Matte in After Effects, the layer from which you call the alpha will be turned off, and the target layer will only be visible in the alpha section of the specified layer.

3. 3

   Luma matte is used when you don't have an alpha channel for a selection, and it uses the luminance or intensity of light emitted from a surface to create transparency; Luma Inverted Matte inverts the Luma.

“In After Effects, you have a layer of text and a video clip of clouds. Explain how to use an alpha track matte to make the text appear to be filled with the moving clouds.”

Sample answer included in the free materials