Need to save varaible to DB

Need to save varaible to DB

I don't even know enough about jquery to be dangerous. However, I ran across this script to pick background color. I can't seem to figure out which variable i need to save the rgba color. I tried grabbing "rgba" but it doesn't work. Can somebody help me put here?

<script>
;(function($){
    $.fn.canvasify = function(f){ // faster than dynamically converting a pixel at a time
        return this.map(function(){
            if (this.nodeName=="IMG"){
                var canvas=$('<canvas>')
                this.src = this.src // IE fix
                $(this).one('load',function(){
                    canvas.attr({width:this.width,height:this.height})
                    canvas[0].getContext('2d').drawImage(this,0,0,this.width,this.height)
                    $(this).replaceWith(canvas)
                })
                return canvas[0]
            }else{
                return this
            }
        })
    }
    function Rgba(rgba){
        this.rgba = rgba
        this.toString = function(){ return "rgba("+Array.prototype.join.call(this.rgba,',')+")" }
    }
    $.Event.prototype.rgba=function(){
        var x =  this.offsetX || (this.pageX - $(this.target).offset().left),
            y =  this.offsetY || (this.pageY - $(this.target).offset().top),
            nodeName = this.target.nodeName
        if (nodeName==="CANVAS")
            return new Rgba(this.target.getContext('2d').getImageData(x,y,1,1).data)
        else if (nodeName==="IMG"){
            var canvas=document.createElement("canvas")
            canvas.width=1
            canvas.height=1
            canvas.getContext('2d').drawImage(this.target,x,y,1,1,0,0,1,1)
            return new Rgba(canvas.getContext('2d').getImageData(0,0,1,1).data)
        } else return null
    }
})(jQuery)
    $(function() {
        $("figure").append("<p class=rgba>")
        $('img').canvasify().click(demo)
    //    $('img').click(demo)
        function demo(e){
            var rgba=e.rgba(),
                figure = $(this).parent()
            figure.css('background-color',rgba).find("p").text(rgba)
        }
    });
    </script>
    <style>
    p.rgba {
        background:white;
        color:black;
        border:1px solid red;
        min-height:20px;
    }
    </style>