• Adobe After Effects Expressions

  adaptation of expression

  Posted by David Larock on September 22, 2015 at 8:59 pm

  Hey guys,

  I’m trying to create an adaptation of this expression used here – https://www.youtube.com/watch?v=4OQN2mHQuD0

  sourceLayer = thisComp.layer(“Transition Control 2”);
  sampleSize = [1,1];
  samplePoint = transform.position;
  colour= sourceLayer.sampleImage(samplePoint,samp­leSize);
  x=colour[0]*100;
  [x,x]

  It’s basically using a gradient to control the scale of a layer. What I’m trying to do is add a min and max value for the scale.

  In this tutorial, the layers are being scaled from 0 to 100.

  In my scene I have a bunch of layers at different scale values that fall from top to bottom. So I want them to scale from a smaller scale to their original scale value then back down to the smaller scale.

  Any help would be greatly appreciated! Hope that made sense 🙂

  Thanks,

  D

  sourceLayer = thisComp.layer("Transition Control 2");
sampleSize = [1,1];
samplePoint = transform.position;
colour= sourceLayer.sampleImage(samplePoint,samp­leSize);
x=colour[0]*100;
[x,x]

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  Kevin Camp replied 10 years, 7 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Kevin Camp

  September 22, 2015 at 11:03 pm

  try this:

  sourceLayer = thisComp.layer(“Transition Control 2”);
  sampleSize = [1,1];
  minScale = 10;
  maxScale = value[0];
  samplePoint = transform.position;
  colour= sourceLayer.sampleImage(samplePoint,samp­leSize);
  x=linear(colour[0], minScale, maxScale);
  [x,x];

  set minScale to the smallest scale value that you want the layer to have. maxScale is set by the layer’s current scale value, but you could change that to a set value if you wanted (i.e., 80).

  Kevin Camp
  Art Director
  KCPQ, KZJO & KRCW

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