• Adobe After Effects

  how to eliminate a black border while compositing

  Posted by Beatriz Hopkins on January 20, 2008 at 5:34 pm

  Hello all,

  I am compositing some elements in After Effects and would like to eliminate a thin black border.

  Thanks for the help,
  Hopkins

  Beatriz Hopkins replied 18 years, 3 months ago 2 Members · 4 Replies
• 4 Replies

• 

  James Curran

  January 20, 2008 at 6:57 pm

  Can you be more specific?

  Do the elements have a premultiplied alpha? That could be the problem.
• 

  Beatriz Hopkins

  January 20, 2008 at 8:12 pm

  thanks for replying.
  Yes, the element is a rendered element in maya and has the alpha channel.
• 

  James Curran

  January 20, 2008 at 8:19 pm

  You’ll probably want to change your alpha channel to straight before rendering from maya.

  In render settings on the maya software tab, under render options > colour / compositing uncheck the ‘premultiply’ box. That should fix it.

  If you’re using some other renderer then i’m not sure of the exact method but you’ll probably have to do something similar.

  If you dont want to re render from maya you might be able to just change the settings in after effects for the alpha channel to premultiplied with black, but if you’ve got any semi transparent areas then it probably wont look like you want it to.
• 

  Beatriz Hopkins

  January 20, 2008 at 9:02 pm

  thanks a lot!
  Hopkins

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