[PD] video bluescreen

mark edward grimm mgrimm at syr.edu
Tue Feb 3 21:19:31 CET 2009


i would be interested in this too if anyone has something. i actually was just trying some stuff out with a green screen but did not get very far. 

although i did not play around for long i did have trouble getting the [pix_chroma_key] to work well (or do anything at all for that matter).

i just did something like:

[gemhead 1]



...but im sure there is someone that knows something better optimized for green/blue screen work.

--- On Tue, 2/3/09, Martin Schied <crinimal at gmx.net> wrote:

> From: Martin Schied <crinimal at gmx.net>
> Subject: Re: [PD] video bluescreen
> To: "Garrett Lynch" <lists at asquare.org>
> Cc: pd-list at iem.at
> Date: Tuesday, February 3, 2009, 2:41 PM
> Hi,
> Garrett Lynch wrote:
> > I'm trying to put together a video bluescreen and
> I'm just not finding 
> > the right object I think.  pix_multiply sort of does
> what I want by 
> > dropping out white in a video and replacing it with
> another video but 
> > how do I get this working with a defined colour (i.e.
> not necessarily 
> > white but the blue or green normally used in studios).
>  There seem a 
> > few objects that deal with different ways of mixing 
> > images/videos pix_mask, pix_mix, pix_composite etc. 
> Which is the 
> > right one to use?  Thanks in advance.
> [pix_chroma_key] could do what you need. For higher quality
> results 
> you'll have to use several objects and use some
> compositing techniques 
> like explained here:
> http://www.blendedplanet.com/?Freebie_Tutorials:The_Ultimate_Keyer
> It's for blender3d and probably overkill for your needs
> but you can use 
> some of its basic principles in GEM too.
>  - btw has anyone done something like that in pd? I only
> used it in 
> blender some time ago.
> cheers,
> Martin
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