[PD] [GEM] Flatten Alpha for storage, then restore it

[chris clepper]

Shaders work well for this type of compositing.  I don't think there is any
need to store the alpha value in the video file.

On Fri, Aug 1, 2008 at 7:25 PM, Spencer Russell <spencer.f.russell at gmail.com
> wrote:

> I'm mixing video by background subtracting it and then setting the
> background transparent (alpha = 0), then texturing each video onto
> overlapping rectangles to achieve a compositing effect.
>
> I need to record the different videos with [pix_record] and then play
> them back later while preserving the alpha somehow, so I was thinking
> that I could just replace all the transparent part with bright pink or
> something and store it as regular photo jpeg frames, and then later
> set all the bright pink parts to transparent when I read the video
> back.
>
> I'm having trouble with both sides of the conversion, though. Perhaps
> there's a better approach entirely?
>
> thanks,
> spencer
>
> _______________________________________________
> Pd-list at iem.at mailing list
> UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20080801/4f5d0deb/attachment.htm>