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Fabien Mosen wrote:
>
> Hello,
> I'm currently doing some simple animations for a friend who
> will need to composite them with other video sources.
>
> Do you know of any video format that preserves the alpha
> channel of the rendered frames ? Or any other procedure
> that will allow us to manage the transparency information
> with the compositing software ?
>
> Fabien.
It depends on what you're looking for exactly. I don't know of any
solution in a program or a video format but I'm going to work on some
bits of video that may include some sort of blue screen stuff. The best
I can think of is to do it in separate frames.
Remco
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Fabien Mosen wrote:
>
> Hello,
> I'm currently doing some simple animations for a friend who
> will need to composite them with other video sources.
>
> Do you know of any video format that preserves the alpha
> channel of the rendered frames ? Or any other procedure
> that will allow us to manage the transparency information
> with the compositing software ?
ULead VideoStudio (bundled with my ATI card) specifically mentions
in the help docs how to use a still or anim with alpha channel combined
with a video source. I have not used this feature.
dik
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In article <3e5cb6d0$1@news.povray.org> , "Andrew Cocker"
<mai### [at] andrewcocker couk> wrote:
>> Do you know of any video format that preserves the alpha
>> channel of the rendered frames ? Or any other procedure
>> that will allow us to manage the transparency information
>> with the compositing software ?
>
> See 6.7.1.5.3 Using the Alpha Channel in the docs. I've never actually
> used it, but it seems
> fairly clear.
It doesn't talk about video formats, does it? ;-)
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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in news:3e5ca2b6$1@news.povray.org Fabien Mosen wrote:
> Do you know of any video format that preserves the alpha
> channel of the rendered frames ?
Not realy a video format but have a look at MNG for animations.
http://www.libpng.org/pub/mng/
Ingo
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Remco de Korte wrote:
> It depends on what you're looking for exactly. I don't know of any
> solution in a program or a video format but I'm going to work on some
> bits of video that may include some sort of blue screen stuff. The best
> I can think of is to do it in separate frames.
Do you know if Adobe Premiere or After Effects can work with a set
of individual frames ? (that's what my friend uses, he's in a
multimedia-stuff school, doing a big project for the end of the
academic year).
(BTW, it would greatly help if POV-Ray was able to output the alpha
channel as separate grayscale frames, as it seems that it's what
commercial renderers do.)
Fabien.
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Fabien Mosen wrote:
>
> Remco de Korte wrote:
>
> > It depends on what you're looking for exactly. I don't know of any
> > solution in a program or a video format but I'm going to work on some
> > bits of video that may include some sort of blue screen stuff. The best
> > I can think of is to do it in separate frames.
>
> Do you know if Adobe Premiere or After Effects can work with a set
> of individual frames ? (that's what my friend uses, he's in a
> multimedia-stuff school, doing a big project for the end of the
> academic year).
>
> (BTW, it would greatly help if POV-Ray was able to output the alpha
> channel as separate grayscale frames, as it seems that it's what
> commercial renderers do.)
>
> Fabien.
Sorry, I have no idea about the programs you mention. I only know them
by name.
My solution will probably turn out to be some homewritten tool (or an
enhancement).
That way I can make it do exactly what I want and process any amount of
frames I'd need.
I'm supposed to be already working on it...
I'm also looking for some cheap (or free) editing program. I don't
really expect that to do the kind of thing I need (= blend live action
over a rendered background - probably...)
Remco
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"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:3e5ce649@news.povray.org...
> In article <3e5cb6d0$1@news.povray.org> , "Andrew Cocker"
> <mai### [at] andrewcockercouk> wrote:
>
> >> Do you know of any video format that preserves the alpha
> >> channel of the rendered frames ? Or any other procedure
> >> that will allow us to manage the transparency information
> >> with the compositing software ?
> >
> > See 6.7.1.5.3 Using the Alpha Channel in the docs. I've never actually
> > used it, but it seems
> > fairly clear.
>
> It doesn't talk about video formats, does it? ;-)
No... :-(
Andy Cocker
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Fabien Mosen <fab### [at] skynetbe> wrote:
> (BTW, it would greatly help if POV-Ray was able to output the alpha
> channel as separate grayscale frames, as it seems that it's what
> commercial renderers do.)
That's odd and sounds cumbersome. (Or is some kind of odd principle they
have that they don't support png, period?)
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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On Wed, 26 Feb 2003 22:08:20 +0100, Fabien Mosen <fab### [at] skynetbe> wrote:
> (BTW, it would greatly help if POV-Ray was able to output the alpha
> channel as separate grayscale frames, as it seems that it's what
> commercial renderers do.)
The alpha channel is accessible in new post-processing stuff for MegaPOV (not
available yet). It is possible to output it to separate file using save_file
feature as well as use it as function for other effects. Also alpha channel can
be obtained from any of post-processes effects used in post-process queue.
follow-ups
ABX
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Remco de Korte <rem### [at] onwijscom> wrote in
news:3E5D3E1B.6CB45246@onwijs.com:
> I'm also looking for some cheap (or free) editing program. I don't
> really expect that to do the kind of thing I need (= blend live action
> over a rendered background - probably...)
>
> Remco
>
You may want to look at http://filmgimp.sourceforge.net/
It is open source and used professionally by the hollywood studios. The
Windows version is due to be released any day now.
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