[PD] pix_video alphachannel

shreeswifty bigswift at ufl.edu
Sun Oct 26 16:57:32 CET 2003

marius i am using pix_video_ds with great success on windows

-----Original Message-----
From: pd-list-admin at iem.at [mailto:pd-list-admin at iem.at]On Behalf Of
marius schebella
Sent: Sunday, October 26, 2003 9:33 AM
To: cgc at humboldtblvd.com
Cc: PD-list at iem.at
Subject: Re: [PD] pix_video alphachannel

hmm, seems I run into a driver problem. I got the current CVS-version
compiled again, alpha-blending is now working, but the video is vertically
flipped... (linux)
on windows the pix_video crashes pd.
are there more versions of the pix_video?

----- Original Message -----
From: <cgc at humboldtblvd.com>
To: "marius schebella" <marius.schebella at chello.at>
Cc: <PD-list at iem.at>
Sent: Sunday, October 26, 2003 9:39 AM
Subject: Re: [PD] pix_video alphachannel

> pix_rgba will add the alpha channel if it's not already present.  I think
by now
> all of the capture objects in CVS should deliver a pixmap with 32bit RGBA
on all
> platforms.
> The [alpha] object enables alpha blending of GL objects, and does not
> pix_ data.
> Apart from the misplaced alpha object, the chain below should end up with
> buffer that contains an alpha channel.  However, pix_alpha seems to be set
> for some keying functions so you probably have to supply the threshold
values to
> avoid completely opaque images.
> You don't say what the purpose of the patch is so I can't really advise
> further.  There are other objects that will directly do blending (pix_mix)
> keying (pix_chroma_key) without the alpha channel.  Perhaps try one of
those if
> they fit the bill.
> cgc
> Quoting marius schebella <marius.schebella at chello.at>:
> > hi,
> >
> > is it possible to convert the liveinput (pix_video) to some format
> > with
> > alpha channel? i tried
> > [pix_video]
> > [alpha]
> > [pix_rgba]
> > [pix_alpha]
> > ...
> > doesnot seem to work.
> >
> > marius.
> >
> >
> > _______________________________________________
> > PD-list mailing list
> > PD-list at iem.at
> > http://iem.at/cgi-bin/mailman/listinfo/pd-list
> >

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