Simple expression for varying opacity over specific time
	If you want an abrupt change in value, but not on every frame, you could use this expression.	After Effects 7 Useful things Expressions Views: 8505 Permalink
visit |  share this  | error?  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. posterizeTime(2); random(20,60); 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. wiggle(1,20); by Paul Tuersley (Min. Version: After Effects 7, Category: Useful things, Type: Expressions)
posted by jamie on Feb 15, 2009

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