lib/functions/rgb.js
function rgb(red, green, blue){
  switch (arguments.length) {
    case 1:
      utils.assertColor(red);
      var color = red.rgba;
      return new nodes.RGBA(
          color.r
        , color.g
        , color.b
        , 1);
    default:
      return rgba(
          red
        , green
        , blue
        , new nodes.Unit(1));
  }
}
function rgb(red, green, blue){
  switch (arguments.length) {
    case 1:
      utils.assertColor(red);
      var color = red.rgba;
      return new nodes.RGBA(
          color.r
        , color.g
        , color.b
        , 1);
    default:
      return rgba(
          red
        , green
        , blue
        , new nodes.Unit(1));
  }
}
function rgb ( red , green , blue ) { switch ( arguments . length ) { case 1 : utils . assertColor ( red ) ; var color = red . rgba ; return new nodes . RGBA ( color . r , color . g , color . b , 1 ) ; default : return rgba ( red , green , blue , new nodes . Unit ( 1 ) ) ; } }
Return a `RGBA` from the r,g,b channels.

Examples:

rgb(255,204,0)
// => #ffcc00

rgb(#fff)
// => #fff

@param {Unit|RGBA|HSLA} red
@param {Unit} green
@param {Unit} blue
@return {RGBA}
@api public
Return a RGBA from the r g b channels .