• Adobe After Effects Expressions

  setValue() to levels effect not returning expected value

  Posted by Jeremy Dance on July 28, 2017 at 4:28 pm

  New to scripting here…
  I’m trying to add a levels effect to a composition and set the value for “Input Black” and “Input White”

  However, when I run the script in After effects I see values thousands above what I put in.

  Here is my code:
  myComp.property(“Effects”).property(“Levels”).property(“Input Black”).setValue(118);
  myComp.property(“Effects”).property(“Levels”).property(“Input White”).setValue(141);

  The value I get in After Effects are:
  Input Black = 30090
  Input White = 35955

  On my last line of my code, I even added an alert to tell me the value of input white.
  alert( . . . (“Input White”).value);
  It said the value for input white was 141 so I know nothing later in the code is changing it.

  What am I not understanding?

  myComp.property("Effects").property("Levels").property("Input Black").setValue(118);
myComp.property("Effects").property("Levels").property("Input White").setValue(141);


  Jeremy Dance replied 8 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  July 28, 2017 at 6:09 pm

  Colors need to be normalized to be between zero and one. So this should work to get 141:

  myComp.property(“Effects”).property(“Levels”).property(“Input White”).setValue(141/255);

  Dan
• 

  Jeremy Dance

  July 28, 2017 at 11:18 pm

  Thanks!

  I’m curious as to where in the documentation I could learn more about this. I’m not sure what words to search in the scripting guide to find it. I’m sure I’ll run into it more.

  For example, I couldn’t get the number I wanted for opacity until I multiplied it by (100/255). What causes that strange behavior?

  myfxComp.property(“Effects”).property(“Drop Shadow”).property(“Opacity”).setValue(43*255/100);
  The above line sets the percentage to 43%

  myComp.property("Effects").property("Drop Shadow").property("Opacity").setValue(43*255/100);

Reply to this Discussion! Login or Sign Up