Re: Video Alpha Channel Problem

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Brian Furtaw (brian++at++sgi.com)
Thu, 20 Feb 1997 10:55:10 -0500

I think the control you want can be achieved through libvl which is part of the
dmedia libraries. Look at the VLControls (chp. 13) and VLBlending (chp. 15) of
the "IRIS Media Libraries Programming Guide" which is in insight. Both chapters
refer to a sample program /usr/share/src/dmedia/video/vl/simpleblend.c that
could help you.

Brian

On Feb 17, 2:40pm, Simon Gibbs wrote:
> Subject: re: Video Alpha Channel Problem
> >
> > I want your help about alpha channel.
> > I use Onyx IR machine and Sirius option for broadcasting.
> > And I use Performer for programming.
> > When I open a window with performer command 'pfNewPWin()',
> > the alpha value which is output by sirius breakbox is always '1'.
> > I want to change this alpha value for the purpose of using
> > ULTIMATTE-8 mat-in function.
>
> We run with similar hardware. Here are a few things to check:
>
> 1) the visual for your pipewindow must have alpha planes
>
> 2) your .cmb should have RGBA10 for the Sirius channel's pixel format
>
> 3) the video drain format (eg set using vcp) is digital 4:2:2:4
>
>
> Hope this helps...
>
> ----------------------------------------------------------------------------
> Simon Gibbs
> GMD - German National Research Center for Information Technology
> 53754 Sankt Augustin
> GERMANY
> ----------------------------------------------------------------------------
> Email: Simon.Gibbs++at++gmd.de
> WWW: http://viswiz.gmd.de/~simon
> ----------------------------------------------------------------------------
>
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from Simon Gibbs

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Brian Furtaw  (brian++at++sgi.com)	
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