• RE:Vision Effects

  Problem with matte in Twixtor Pro in AE

  Posted by Michal Kidawa on November 1, 2013 at 11:57 am

  Hi,

  as in the title. I made a matte using roto brush tool, so I had 2 clips, one original and one with a mask. Then I applied twixtor pro on the original clip and set FG1 to the mask clip. What is wrong is that the mask don’t work. I change the view to FG1 twixtored and I see, depending on matte chan option:
  – red/blue/green : each fram is in different grayscale (but not only selection, whole frame)
  – alpha : frames comes as original
  When I change view to BG twixtored I get black frames. What should I do? I tried to follow this tutorial: https://www.youtube.com/watch?v=QtOsELb-Cfg but don’t know what’s happening on 3:36.

  I will be very thankful for any advice.

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  Pierre Jasmin replied 12 years, 8 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Peter Litwinowicz

  November 1, 2013 at 3:54 pm

  You need to pre-comp the layer that has the masks. Unfortunately, After Effects does not pass the proper alpha channel to Twixtor when the masking is done on another layer within the same comp.

  Then, make sure to choose “Alpha” for the FG1 Mask Chan.

  Hopefully this helps,
  Pete Litwinowicz
• 

  Pierre Jasmin

  November 1, 2013 at 4:09 pm

  Did you select the layer with matte and precompose (Layer|Pre-Compose)?
  The alpha channel then should be fine

  Pierre

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