color convert RGB<==>HEX

gistfile1.js

function hex2rgb( $colour ) {
        if ( $colour[0] == '#' ) {
                $colour = substr( $colour, 1 );
        }
        if ( strlen( $colour ) == 6 ) {
                list( $r, $g, $b ) = array( $colour[0] . $colour[1], $colour[2] . $colour[3], $colour[4] . $colour[5] );
        } elseif ( strlen( $colour ) == 3 ) {
                list( $r, $g, $b ) = array( $colour[0] . $colour[0], $colour[1] . $colour[1], $colour[2] . $colour[2] );
        } else {
                return false;
        }
        $r = hexdec( $r );
        $g = hexdec( $g );
        $b = hexdec( $b );
        return array( 'red' => $r, 'green' => $g, 'blue' => $b );
}

 

function hexToRgb(h)
{
    var r = parseInt((cutHex(h)).substring(0,2),16), g = ((cutHex(h)).substring(2,4),16), b = parseInt((cutHex(h)).substring(4,6),16)
    return r+''+b+''+b;
}

 

function cutHex(h) {return (h.charAt(0)=="#") ? h.substring(1,7):h}

 

//usage
console.log(hexToRgb("#FFFFFF"));

 

function RGB2Color(r,g,b)
{
  return '#' + this.byte2Hex(r) + this.byte2Hex(g) + this.byte2Hex(b);
}

 

function byte2Hex (n)
{
  var nybHexString = "0123456789ABCDEF";
  return String(nybHexString.substr((n >> 4) & 0x0F,1)) + nybHexString.substr(n & 0x0F,1);
}

 

function rgb2hex(rgb){
 rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 return "#" +
  ("0" + parseInt(rgb[1],10).toString(16)).slice(-2) +
  ("0" + parseInt(rgb[2],10).toString(16)).slice(-2) +
  ("0" + parseInt(rgb[3],10).toString(16)).slice(-2);
}