• Adobe After Effects

  Exporting out alpha channel

  Posted by Kangling Teo on June 6, 2010 at 1:48 pm

  Hey,

  I’ve made a title sequence that I’m going to put onto live footage in FCP, so I exported out the sequence in alpha.

  Problem is, when I export it out, the lens flare in my sequence is kind of screwed up and my text lost their colours.

  Any ideas how to fix it?

  Additional info:
  Lens flare layers in Add transfer mode.
  Used colorize from Hue/Sat for the colors on text/lens flare
  Used animation compressor

  Thanks in advance!

  Michael Lange replied 16 years, 3 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Tudor “ted” jelescu

  June 6, 2010 at 4:21 pm

  Here’s a great tutorial that will not only help you composite a lens flare, but give you some pointers on compositing in general:
  https://library.creativecow.net/rollason_ben/lens-flare/1

  Tudor “Ted” Jelescu
  Senior VFX Artist
  Bucharest, Romania
  http://www.ennstudio.ro
• 

  Michael Lange

  June 6, 2010 at 9:04 pm

  When you export with an alpha, make sure you set the alpha channel type correctly in FCP. Ctrl-click the clip in FCP and choose ‘Item Properties’ Set the alpha channel type to whatever is appropriate for your clip.

  I would recommend exporting anything out of AE with a “straight alpha” since some other NLE, such as Avid, don’t easily support premultiplied alpha channels.

  Michael Lange
  Producer/Editor
  https://www.langetv.com/blog

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