Apple Motion 3 User Manual
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Chapter 3
Basic Compositing
Blend modes can create transparency in an object regardless of the setting of its
opacity parameter. This is because the pixels of an image with a selected blend mode
are combined with the pixels of any objects lying immediately below it in the Canvas.
For example, if you overlapped two objects, then turned the blend mode of the top
one to Screen, the darker areas of the screened image become transparent, while the
lighter areas remain more solid, resulting in the following image:
Important:
The transparency created by most of the available blend modes only affects
how an object combines with overlapping objects underneath. These blend modes do
nothing to affect an object’s alpha channel. For information about blend modes that do
affect an object’s alpha channel, see “
Blend Modes That Manipulate Alpha Channels
Each blend mode combines objects in different ways. For example, setting the top
object’s blend mode to Multiply yields a result opposite to that of the Screen blend
mode, as the darker areas of the image remain solid, and the lighter areas become
transparent.