• Adobe After Effects Expressions

  Linear Expression for the Scale Property

  Posted by Christian Simpson on February 25, 2023 at 3:17 am

  Hey All,

  I am attempting to map an image’s scale that is currently scaled at 15% to a null that is currently at 100%. I would like to use the linear expression to do this. I’ve tried to write this several different ways and I keep getting an error that says “argument 1 to linear() must be scalar”. I can use linear expressions with values no problem but am running into trouble with the scale property. Any ideas how to write a simple linear expression for scale?

  var input = thisComp.layer("Null 30").transform.scale
  linear(input,0,100,[0,0],[15,15]);

  Dan Ebberts replied 3 years, 5 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  February 25, 2023 at 3:33 am

  You were close. Try it this way:

  var input = thisComp.layer("Null 30").transform.scale[0];
  linear(input,0,100,[0,0],[15,15]);
• 

  Christian Simpson

  February 25, 2023 at 4:46 am

  Darn! Thank you as always Dan. I don’t understand the 0 beside transform.scale but it works!
• 

  Dan Ebberts

  February 25, 2023 at 5:31 am

  The [0] gives you just the x value of the scale, which meets the requirements for the scalar value required by linear().

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