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Track Matte in After Effects

Home » Design » Design Tutorials » After Effects Tutorial » Track Matte in After Effects

track matte in after effects

Introduction to Track Matte in After Effects

Track Matte in After Effects is a layer that can control the opacity of the layer immediately below it. The track matte layer is invisible. A track matte creates holes or spaces through which the underlying layer is seen. But isn’t this what the masking tool does? Yes and No. Read on to understand.

Differences between a Mask and a Track Matte

  • The key difference between a mask and a track matte is that a mask is applied directly onto a layer containing a video or an image and it transforms when the layer transforms. This means that when the layer is moved or rotated or scaled, the mask undergoes these changes too.
  • In essence, a track matte is more like a stationary mask. A track matte is applied to the composition rather than to a layer. Things move in and out of a track matte while the track matte is itself fixed in place.
  • Of course, a mask can be made stationery too, by using elaborate methods to transform the mask so that the changes done on a layer do not affect it. But it is very cumbersome. A track matte avoids those steps.
  • But a track matte can be transformed too if one chooses to deliberately do so.

Where is the Track Matte Located?

  • Track Matte is located in the Timeline Window as seen in the figure.

Timeline Window

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  • If it is not available there you may have to toggle the Transfer Controls Pane button at the bottom left of the timeline as shown in the figure.

track matte fig2

  • A track matte is available only to a bottom layer i.e. it is available only if there is a layer above this particular layer. Let me add 2 layers to my composition and explain what I meant.

adding 2 layers (track matte in after effects)

  • Here the Track Matte (TrkMat) menu is revealed now.

track matte menu

  • When you click on the little arrow at the right of “None”, a drop-down menu with four options is revealed. There are two options with Alpha and two with Luma.

Alpha and Luma options

Uses of Alpha Matte 

  • Alpha indicates the presence of pixels or opacity while the Luma (short for luminosity) indicates the brightness information. We know that the shape layer contains a black rectangle. If you click on the Alpha Matte for the scenery layer, notice what happens.

scenery layer

  • Only the shape layer-portion of the scenery is revealed. You can move around the shape layer to reveal a different portion of the layer beneath it.

different portion of the layer

  • The output does not change even when you change the color of the rectangle to white or red or anything else.

color of the rectangle

  • You can see the image below.

output effects (track matte in after effects)

Alpha Inverted Matte

Select Alpha Inverted matte from common panel.

common panel

If instead of Alpha, you choose to go with the Alpha Inverted matte, the scenery is displayed in areas outside of the shape layer as shown below.

shape layer

Click on the Toggle Transparency Grid button.

Toggle Transparency Grid

The transparent background makes it clear that the black holes you were seeing before took the background color of the composition. This can be changed if necessary by going to the Composition Settings menu option (Composition Menu -> Composition Settings) (Shortcut is Ctrl+K).

Composition Settings menu

Luma Matte

  •  Now let us apply the Luma Matte on the scenery and see the output. The luminosity information from the shape layer has been used to display the scenery layer. As you can see the opacity changes with the amount of light present in the shape layer.

Luma Matte on scenery

Hence white appears with 100% opacity, black with 0% opacity and red with opacity somewhere in between.

Luma Inverse Matte

  • The Luma Inverse Matte gives the exact opposite result as seen below.

luma inverse matte

Uses of Track Matte

  • Let us look at some ways in which Track Matte can be used creatively. Suppose you have a text in which you want an image, a motion graphic or a video to play.

Track Matte Text 1

A track matte will work excellently for your image.

Track Matte Text 2

You can change the font of the image.

motion graphic ( track matte in after effects)

You can also change the size or its position to suit your needs.

change position rotation in after effects

While using Luma Mattes, you can play around with contrasts to reveal or hide portions of a layer. This works especially well while using textures.

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using textures

In conclusion, track matte is a useful feature in After Effects which will help designers to make interesting graphics.

Recommended Articles

This is a guide to Track Matte in After Effects. Here we discuss the differences between Mask and Track Matte along with its various features and the uses of Matte in After Effects. You can also through our other related articles to learn more –

  1. Tools in After Effects
  2. Text Effects in After Effects
  3. Effects in Illustrator
  4. Blending Modes in Illustrator

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