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Lens Flare in AE and Premultiplication Explained

COW Library : Adobe After Effects Tutorials : Ben Rollason : Lens Flare in AE and Premultiplication Explained
CreativeCOW presents Lens Flare in AE and Premultiplication Explained -- Adobe After Effects Tutorial


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Ben reveals not only the easy steps to giving a lens flare an alpha channel for exporting, but also explains what premultiplication means. With this understanding, you may more easily solve some of your trickier compositing problems. In most programs, such as Nuke, Fusion, or Shake, you control premultiplication and predivison manually. Since After Effects does this all for you, it can become very frustrating if you are accustomed to doing this manually and find that you cannot in AE. This tutorial will explain a little background information on how compositing applications create a composite.



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Comments

Re: Lens Flare in AE and Premultiplication Explained
by roei tzoref
hey ben thanks for the nice technique for the lens flare.

the second part I will need to watch a few more
times its hard to get my head around that

about the first part
I want to share a way that you could do the same effect without precomposing
and that's with using Shift Channels instead of Set Matte Effect.

inside the effect choose "Take Alpha From Luminance"
and you're good go. just put Channel Combinder with
From Straight to premultiplied and all in one Effect
without precomposing.
Re: Lens Flare in AE and Premultiplication Explained
by ben rollason
Hi Michael...

Thanks for the comments. Glad it's useful.

Verbose? Maybe a bit, but you never know what level folks are at with their AE and premultiplication is an important idea that's not majorly intuitive.

Perhaps I'll speed it up a bit next time, though! :)

-B.

vfx.benrollason.com
Re: Lens Flare in AE and Premultiplication Explained
by Michael Heid
Great information Ben thanks! I've been wondering how to do this for a long time. One other comment, this is a remarkably verbose tutorial that could have the same amount of information in half the time. Thanks again!

Re: Lens Flare in AE and Premultiplication Explained
by Roland R. Kahlenberg
Welcome aboard Ben. I'll take a look at the article shortly.

Cheers
RoRK

Sell your AEPs with broadcastGEMs' DVD series of templates. Click here for more
Re: Lens Flare in AE and Premultiplication Explained
by ben rollason
Thanks Roland. I hope you like it.

-Ben.

vfx.benrollason.com


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