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New to AE: Creating effect for Flash with an alpha channel
Hello all. I am very new to After Effects and have had to jump into it to get a project done. I thought it would be simple: use Trapcode’s Particular plugin to create an effect, export it with an alpha channel to FLV format, and use it in my Flash movie.
However, I have run into an issue with the edges of my effect. AE seems to take the composition’s background color and feather it into the edges of the particle effect. The undesired result is when my AE composition’s color is white, and import the FLV into Flash with a black background, I get white edges on the edges of the effect.
Some details:
1. The effect is places on a solid layer.
2. When I toggle “Toggle Transparency Grid” I see the effect without the composition’s background- the way I wish it would export.Am I missing anything? Thanks for any input.
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4 Replies
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Sorry, but could I ask where you do this. I have been trying to find out info on using, rendering, and exporting with alpha channels and have not come across too much information. I really appreciate your help!
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So Dave was completely correct with the Straight vs Premultiplied alpha. However, with static images or Solid layers I am not able to get rid of the composition background bleeding into the edges of my effect. To re-cap, I am using a Solid Layer with a fireworks effect (cheesy, yes) and I am still getting the composition background color bleeding into the edges.
If I have “footage” in my composition, I can “Interpret Footage” as Straight Alpha. However, when I use a static image or Solid with an effect attached, interpretation does not seem to happen. Is there a setting I am missing?
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At least with solid layers, I can understand that you would be having a huge problem, because (anyone correct me) the alpha channel will be the entire frame because of the solid. This is like trying to get just a lens flare effect to render out with alpha but in wants to have a layer to render onto. It does not generate its own alpha channel. I’m curious how you just seem to be getting the solid to show only at the edges of your effect and not the rest of the frame. If the effect has an alpha channel, what is the purpose of the solid?
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Here’s a tutorial on Straight vs. premultiplied:
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Aharon Rabinowitz
aharon(AT)yahoo(DOT)com
http://www.allbetsareoff.com—————————————-
Click the link below to subscribe to the Creative Cow After Effects Podcast, and get free AE video tutorials:https://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=111087911
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