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From: [e-mail] (Mike Harlock)
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Subject: Re: Why don't lense flares show up in Alpha channel saves?
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         (from [e-mail] (Mark Thompson))
         (at Fri, 20 Oct 1995 01:13:22 -0700)
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Hi Mark,

> [e-mail] (Mike Harlock) writes:
> > Should I just self-key it with a 0 saturation render?  I rendered it
> > against black, of course, so perhaps it's own transparency is what it needs.
>
> Yeah stock answer....I covered this in a previous LWPro article on
> compositing. Lens flares are a purely additive effect. They should NOT be
> keyed but simply added to the composite. Rendering to a black background is
> the correct thing to do. If digitally compositing, do an absolute add of
> the flare over your footage. Unfortunately, most standard video switchers
> and keyers don't allow for such a thing. They want a key channel. For that
> you must enable Fader Alpha. This will cause flares to have a non-black
> alpha channel, but with two drawbacks: The flare will only be white, and
> it will be blended to your imagery in a non-additive fashion.

It will be used in an Imix cube, which uses 256 grey for alphas, so everything
will be fine.  I just wanted to make sure that flares indeed do not generate
alphas.   Thanks!

--Mike


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