• Adobe After Effects

  Expression Slider

  Posted by Brad Strickman on June 20, 2007 at 6:25 pm

  I have 2 layers, an audio layer and a still image. I have converted the audio to keyframes, giving me all the keyframes for amplitude. I am attempting to alter the scale of the still through expressions linking it to the audio. The issue is that the amplitude range is 0-100 and the range of scale I need is 60-80. How do I convert the ratio of the amplitude keyframes so that they fall within the proper range? Thanks for any help.

  Brad Strickman

  Lord Scales replied 18 years, 10 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Lord Scales

  June 20, 2007 at 6:57 pm

  Try:

  A = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”); //the audio layer
  minScale = [60, 60]; //minimum scale
  maxScale = [80, 80]; //maximum scale
  linear (A, 0, 100, minScale, maxScale) //as A goes from 0 to 100, Scale value goes from minScale to maxScale in a linear interpolation

  Change the values as necessary. I tested here and worked fine.

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