I use alpha channel tga files for animations which I import into Premiere. By using
the alpha channel I can "blue screen" the animation onto other animations or video.
Works pretty well!

Bob Hughes wrote:

> I only just recently tried alpha channel output +UA as a png file and
> then used that as an image file and saw nothing different.
> Yes, transmit and filter were applied to 'all'. Maybe it did, maybe it
> didn't change it, I was looking for the obvious.
> Opening the file with PSP showed the image to definately have Alpha as
> compared to a non-Alpha png. Thing is PSP couldn't show anything there,
> just black or blank, even if I added a second channel in with PSP
> itself.
> I also used Bits_per_Color to increase the "bandwith" so to speak to
> make room for 8 bits of transparency info in that Alpha Channel.
> I never understood it to begin with, and now I know why. I agree, the
> only way to learn is if others have used it and can manage a
> tutorial-like explanation or a word of sense about it at least.
>
> Spider wrote:
> >
> > Hmm, i'm not certain I understand what the alpha channel really is, as I see it
> > it is a channel that is applied over the rest image, and that controls the
> > "transparencey" of each pixel. is this it ?
> >
> > Peter Popov wrote:
> > >
> > > I posted this in povray.general about a week ago, but 1) that was not
> > > the right place to and 2) there was some massove discussion going on
> > > so nobody noticed it. I might be luckier this time :)
> > Perhaps. I read the first post, but hoped for a discussion so I could have some
> > more facts about the alpha channels before I went in and commented. Now,I'll
> > have to show my ignorance and ask you pplz (and uncle ken) instead. :-)
> >
> > <snip>
>
> --
>  omniVERSE: beyond the universe
>   http://members.aol.com/inversez/homepage.htm
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