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Chapter 17. Complex Projects > Using Expressions

Using Expressions

Expressions define relationships between layer properties (in the same layer, in different layers, even in layers that reside in different compositions). Rather than keyframe properties independently, you can link the values of one property to another, using a JavaScript-based instruction, or expression. Expressions allow you to create sophisticated relationships between properties that you could other wise produce only via painstaking keyframing (or by using the Production Bundle's Motion Math feature). Expressions can also use a mathematical formula to arrive at a property's values.


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