[PD] color keying using pd and Gem for OSX
tigital at mac.com
Sun Jun 22 22:03:53 CEST 2003
On Saturday, June 21, 2003, at 08:35 AM, tim cleminson wrote:
> 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
...luckily, you just seem to be going about it the wrong way ;-) There
are quite a few objects with the latest 0.88cvs version of GEM that do
this: pix_composite, pix_chromakey, pix_mix, yuv_luma_key(note to
self: needs to be moved to pix_ group), pix_mask, pix_multiply, and
I'm sure there are others...all of these can mix two inputs together,
just in different ways...
...don't forget that if you have a rage128 or above, you should
probably use pix_filmYUV...
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