[PD] gem advanced video keying

[hi]

thanks for the answer!

i will need to start to use shaders one day, i know that long already **dream** For now the project goes back to the drawer

I would love to see a new pd convention to find motivation for week intense pd work..


Am 26.08.2015 um 09:46 schrieb Py Fave <pyfave at gmail.com>:

> 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 at 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 at lists.iem.at mailing list
>> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list