• Adobe After Effects

  Effects are not visible when using an alpha channel

  Posted by Cathleya on June 25, 2007 at 7:14 pm

  Hi,

  I’m creating a graphic that contain lens flares (on adjustment layers) and drop shadows (directly to the graphics), and I’m rendering them with an alpha channel so that i can change the background. When I do this, the effects do not show up….they only show up if I add a background layer to the graphic. because of time constraints, i really need to be able to render my graphics with no background layer. Does anyone know the fix to this problem, if there is one?

  Thank You!

  Erik Pontius replied 18 years, 11 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Jeff Mcbride

  June 25, 2007 at 7:36 pm

  What I’ve done is create a Lens Flare over a Black solid then duplicate it. On the bottom layer in TrackMatte settings choose Luma Matte “Top Layer” Now if you select Toggle Transparency Grid in the comp window window (Checkerboard icon) you can see thru the Flare. But, the intensity won’t be as strong, so I like to add a black solid (or whatever the background will eventually be) underneath both layers and then adjust both the Flare Brightness properties back to normal.

  Then just drop the bg layer and render, making sure to include Alpha Channels.
• 

  Jeff Mcbride

  June 25, 2007 at 7:49 pm

  Or even easier and better, get UnMult. It’s Free.

  https://www.redgiantsoftware.com/unmult.html
• 

  Erik Pontius

  June 25, 2007 at 10:52 pm

  Unmult is the way to go. Add your lens flare to a solid black solid layer, then add the unmultiply to remove the black, leaving your lens flare.

  Erik

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