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Simple expression for varying opacity over specific time

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If you want an abrupt change in value, but not on every frame, you could use this expression.
After Effects 7
Useful things

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Although the second line would normally create a new random value between 20 and 60 on each frame, the preceding posterizeTime(frames per second) method is lowering the frame rate of the resulting expression.
If you want something that gradually changes over time, you could set the Opacity value to the middle of your desired value range (i.e halfway between 20-60 is 40) then use this expression. The first number is wiggles per second, the second number is the max amount the value will change.
by Paul Tuersley

(Min. Version: After Effects 7, Category: Useful things, Type: Expressions)
posted by jamie on Feb 15, 2009


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