code: def ycbcr2rgb(y__, cb_, cr_):
      
  
      kb_ = 0.114
      kr_ = 0.299
  
      r__ = 2 * cr_ / (1 - kr_) + y__
      b__ = 2 * cb_ / (1 - kb_) + y__
      g__ = (y__ - kr_ * r__ - kb_ * b__) / (1 - kr_ - kb_)
  
      return r__, g__, b__
docs: Convert the three YCbCr channels to RGB channels.