[PD] pix_video alphachannel

[marius schebella]

thnx,

I thought the pix_video_ds, later pix_videoDS has now become the standard 
pix_video and was integrated into GEM???
I am starting to mix things up, better I have a short break and go through 
docs and mailing list again, to many OSs and versions...

cu, marius.


On Sunday 26 October 2003 16:57, shreeswifty wrote:
> 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
>
>
> hi,
> 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?
> marius.
>
>
>
> ----- 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
>
> affect
>
> > pix_ data.
> >
> > Apart from the misplaced alpha object, the chain below should end up with
>
> a
>
> > buffer that contains an alpha channel.  However, pix_alpha seems to be
> > set
>
> up
>
> > 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
>
> much
>
> > further.  There are other objects that will directly do blending
> > (pix_mix)
>
> and
>
> > 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.
> > >
> > >
> > > _______________________________________________
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> > > PD-list at iem.at
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>
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