Apple Motion 2 - Manual (Page 245)

Chapter 3 Basic Compositing 245
Each blend mode combines objects in different ways. For example, setting the top
object’s blend mode to Multiply yields the opposite result, as the darker areas of the
image remain solid, and the lighter areas become transparent.
Blend modes only affect the combination of an object with the objects below it. Any
objects appearing above have no effect on this interaction, even if the object is
transparent. In the following example, the text objects on the top level have no effect
on the blended images below.
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