you need to use glsl shaders to do that efficiently .
first check for existing shaders
you will need a powerful gpu
this is a lumakey example (was sent to me by chdh)
keying.frag
uniform float R,G,B,K; uniform sampler2D texture;
void main (void) { float d = 0.; vec4 color = texture2D(texture, gl_TexCoord[0].st );
d+= abs(color.r - R);
d+= abs(color.g - G);
d+= abs(color.b - B);
d*=K;
color.a = abs(d);
gl_FragColor = color;
}
2015-08-12 15:13 GMT+02:00 hi via Pd-list pd-list@lists.iem.at:
Dear Pd folk,
I am investigating options to improve chroma keying within pd and gem to use within a theater installation. I need more advanced keying features than seemingly possible with [pix_choma_key], like border corrections and smoother edge transparencies. The best thing i found so far is this:
http://forum.pdpatchrepo.info/topic/2953/neat-chroma-keying/3
very nice, but i would need more a quality like in readymade video mixers Did any of you program anything like that?
Also i'm trying to find out, whether a potential setup with a computer with 4 HD-SDI inputs would be capable of keying 2 HD-live-signals at the same time and overlay that over one HD-live-background.
Are there any experiences (hardware and software) from your side, you could share?
I would so much love to make this happen with pd and not with an expensive video mixer i would have to buy.
Any help or ideas are appreciated.
Love to pd,
jonny _______________________________________________ Pd-list@lists.iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list