Apple Motion 3 - Manual (Page 613)

Chapter 7 Using Text 613
To use text to mask an image:
1 In the Layers tab or Canvas, select the layer you want to use as the texture.
2 Choose Object > Add Image Mask (or press Shift-Command-M).
A blank image mask layer is added to the image.
3 Drag the text that you want to use as a mask to one of the following:
 The Mask Source well in the Image Mask HUD.
 The Image Mask layer in the Layers tab (drop the text on the Image Mask layer in the
Layers tab).
 The Image well in the Image Mask tab of the Inspector.
Selected image to be masked by text layer
Artwork courtesy of Adam Cetorelli, ©2005