Convert RGB to RGBA over white

rgb-to-rgba.js

function RGBtoRGBA(r, g, b){
    if((g==void 0) && (typeof r == 'string')){
        r = r.replace(/^\s*#|\s*$/g, '');
        if(r.length == 3){
            r = r.replace(/(.)/g, '$1$1');
        }
        g = parseInt(r.substr(2, 2), 16);
        b = parseInt(r.substr(4, 2), 16);
        r = parseInt(r.substr(0, 2), 16);
    }

    var min, a = ( 255 - (min = Math.min(r, g, b)) ) / 255;

    return {
        r    : r = 0|( r - min ) / a,
        g    : g = 0|( g - min ) / a,
        b    : b = 0|( b - min ) / a,
        a    : a = (0|1000*a)/1000,
        rgba : 'rgba(' + r + ', ' + g + ', ' + b + ', ' + a + ')'
    };
}