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Intro to image masks in Motion

Another way to create transparency in a layer is by using image masks. An image mask creates transparency in a layer by deriving an alpha channel from another layer, such as a shape, text, movie, or still image.

Canvas showing example of image mask

Note: You can use masks and image masks together.

The power of image masks is that they do not have to be drawn or animated.

Using image masks is easy. First you apply an image mask, and then you make adjustments in the Behaviors Inspector.

You can add filters to image masks to further manipulate the transparency effect. You may be able to improve an image mask by using Color filters such as Brightness, Contrast, and Gamma to manipulate the effect, enhancing or reducing detail to create the transparency you need. See Applying filters or behaviors to masks.

You can also apply behaviors to image masks to create animated transparency effects. See Applying filters or behaviors to masks.

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