• Adobe After Effects

  Mask outline looking different in preview and render

  Posted by Teo Mathlein on June 6, 2012 at 2:07 am

  I’m having trouble with exporting a video with masked out layer. The lady in the images is masked out from a different shot than the background. In the AE preview my mask looks alright, but when rendered out artifacts start to appear around the edges of the mask. I recognize the artifacts as the mask layer bleeding through, but I have no idea how to get rid of this.

  I have Open GL turned of both when rendering and in preview.
  However, the only way I did manage to get rid of the artifacts was to render the sequence out with Open GL, but that resulted in some other problems. And from what I’ve read here I gather it’s never a good idea to render in Open GL anyway.

  I rendered these out with the unedited “best settings” and the problem stays whether i render to uncompressed avi, png sequence or h264. I use After Effects CS5.5

  
  These two are from the same frame, before and after render.

  Love this forum! First time I’m so stuck I actually have to make a post myself though..

  Teo Mathlein replied 14 years, 1 month ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Fredley

  June 6, 2012 at 2:13 am

  Is motion blur enabled for the layer? It might be turned off for preview but shows up during render if set to “Best”.
• 

  Teo Mathlein

  June 6, 2012 at 2:24 am

  Wow, that was exactly the problem. Boy do I feel stupid.

  Thanks a lot though! I would have been up all night trying different render settings before realizing it was that simple.

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