re: Video Alpha Channel Problem

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Simon Gibbs (Simon.Gibbs++at++gmd.de)
Mon, 17 Feb 1997 14:40:39 +0100 (MET)

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>
> 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...

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Simon Gibbs
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