• Adobe After Effects

  How to export AVIs w/alphas?

  Posted by Javierdl on February 11, 2006 at 6:34 am

  It’s been so long since I did these things I can’t recall now and I could certainly use some memory refreshing

  Ok, this is what I’ve done, have a look and let me know what I’m missing:
  1. Imported a QuickTime file with a green screen already set.
  2. Applyied Color Key Effect, and keyed out its green screen (which worked just fine).
  3. Made sure of having these settings:
  Channel: RGB+Alpha
  Depth: Millions of Color+
  Color: Straight (Unmatted)
  4. exported to avi

  On my 2nd attempt:
  1. Went back to same project and added “Set Matte”, without changing anything in the configuration.

  Should I leave the Set Matte effect there?
  This is how my effects list looks like:
  https://www.javierdl.com/temp/ae_effects.gif

  After each try, I would go back and import the created avi, put it in the timeline, and then put a still image under to confirm that the alpha was working.
  Needless to say nothing has worked.
  Can someone please enlighten me and tell me what am I doing wrong?

  Thanks in advance,

  JDL

  Alexxx replied 20 years, 6 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Alexxx

  February 13, 2006 at 3:14 am

  Does it HAVE to be .avi? Generally the most common format for exporting high quality footage WITH alpha is Quicktime-Animation. A lot of people use this a it’s compressed lossless and allows for an alpha channel all in the one file.

  Just do your green-screen keying and then render to Quicktime, Million Colors+ and RGB+ALPHA and make sure you select the ANIMATION codec.

  Now bring that back in and see. You should have the alpha all intact from the previous key-job.

  Alex

  http://www.lightdrop.com.au

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