[PD] color keying using pd and Gem for OSX

leo {depart} oel at depart.at
Sun Jun 22 12:31:58 CEST 2003

hi tim!

you might send me your patch (at least the part where you try the keying)
so that i can have a look...
keying works fine with pix_alpha here,
do not forget to add an [alpha] object to the gl-queue.
what version of gem are you using?



>Date: Sat, 21 Jun 2003 13:35:23 +0100
>From: tim cleminson <si1ver at seabassmassive.com>
>To: pd-list at iem.at
>Subject: [PD] color keying using pd and Gem for OSX
>         i am having limited success achieving color keying using 2 stream of
>video. Have tried using the [pix_alpha] method and can achieve color
>keying using to picture sources
>or using video as the background and an image as the keyed foreground,
>but replacing the foreground image with a movie does not work.
>         tried converting the foreground movie using [pix_rgba] but no 
> use, it
>just screws up the color. using  [pix_hsv2rgb] results in some sort of
>keying but not through the pix_alpha method just as a result of
>shifting the color fields around.
>         i was wondering if
>                 a) what i am trying to do is just wrong
>                 b) some crucial step is missing
>                 c) GEM implementation on OS X is lacking
>cheers, tim

More information about the Pd-list mailing list