• Adobe After Effects Expressions

  Double Exposure in AE

  Posted by Allen Bian on January 17, 2018 at 2:20 am

  hey Guys, need some help with AE expressions… So my goal is that have 1 or 2 lines of expression on Opacity of a picture or solid layer and when you duplicate the layer, the opacity will change automatically. For example, the first layer is 100%, and when you duplicate it, the new layer will be 50% and the next one will be 33% so on….
  The expression should be a index one, i am not sure what exactly it is, something like index>1 bulabulabula..

  Thanks!

  Dan Ebberts replied 8 years, 6 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  January 17, 2018 at 4:24 am

  Try this:

  index*100/thisComp.numLayers;

  (assumes all layers are participating)

  Dan
• 

  Allen Bian

  January 17, 2018 at 7:53 am

  Thanks for helping me, but can you be more specific for me?

  In my workspace, I created 10 layers since I don’t know how to write an automatic expression on Opacity, so the opacity of my first ‘Image Choice_1’ layer is 100%, and I wrote this on ‘ImageChoice_2’ layer: ‘ if(thisComp.layer(“ImageChoice_1”).transform.opacity>=100) 50 else 100; ‘.

  How to add your expression(index*100 thisComp.layer) to mine?
• 

  Dan Ebberts

  January 17, 2018 at 2:02 pm

  I’m not sure why you would need to combine expressions. If you apply my expression to each layer, you should get this for 1 layer:

  100

  this for 2 layers:

  50
  100

  this for 3 layers:

  33
  67
  100

  this for 4 layers:

  25
  50
  75
  100

  etc.

  Isn’t that what you wanted?

  Dan

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