• Adobe After Effects

  Exporting alpha channel as a mask

  Posted by Keiran O’brien on January 22, 2006 at 3:40 pm

  Despite searching the manual I am unsure how or if I can key out the green screened background from some live action video and then export the resulting alpha channel as a mask – either as an AVI file or image sequence (preferably both).I am using Version 6.5 Pro.

  Chris Smith replied 20 years, 7 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Chris Smith

  January 22, 2006 at 4:37 pm

  Switch around the channels using one of the channel effects. So make the R, G, and B all equal alpha.

  Or create a white solid. Put the keyed footage one layer above it. Then set the white solid’s track matte to alpha.

  Chris Smith
  https://www.sugarfilmproduction.com
• 

  Roland R. kahlenberg

  January 22, 2006 at 6:25 pm

  Hi Chris, wouldn’t setting the Output Module to render just the Alpha Channel do the trick?

  Cheers
  RoRK
  broadcastGEMs
  customizable animated backdrops with Adobe After Effects project files
• 

  Chris Smith

  January 22, 2006 at 6:41 pm

  haha. I suppose so. See what I get for never really getting to know the render module? The render module and I are 2 ships passing in the night. Did they hide the new color corrector and roto tools in the render module in AE7?

  🙂

  Chris Smith
  https://www.sugarfilmproduction.com

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