[PD] video bluescreen

Martin Schied crinimal at gmx.net
Tue Feb 3 20:41:42 CET 2009


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:


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.


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