[PD] gem advanced video keying

[hi]

Hi p f

i have seen caspar before, interesting project. I started checking your glsl example and am starting to discover the shader beautyness!!

the original keying project went dead because artistical difficulties, but i will research a little more..


Am 08.09.2015 um 16:44 schrieb Py Fave <pyfave at gmail.com>:

> check this
> 
> http://www.casparcg.com/
> 
> 2015-09-07 19:28 GMT+02:00 hi <joson.android at googlemail.com>:
>> 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
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>>