first thanks to all with your's comments i could make my setup actually 55" with ws2812b ,rpi3 and arduino , with the last link Giovanne i could play with the parameters, actually its running 640x480 with hp webcam hd 720p 2200 , and your excel works excellent now the colors seems correct but they just are not that strong , with the framegrabber the colors looks strongers, i do now if its the cam or my parameters , any ideas? maybe i mising finetuning in color , what webcam resolution are you using ,i going to try with more resolution or finetuning the colors