gistfile1.js

    function computeAspectRatio(_w, _h) {
        if (_w !== 0 && _h !== 0) {
            var aspectRatio = Math.ceil(_w/_h * 10);
            //smooth out rounding issues.
            switch (aspectRatio) {
                case 30:
                case 31:
                    crop = "3x1";
                    break;
                case 20:
                    crop = "2x1";
                    break;
                case 14:
                    crop = "4x3";
                    break;
                case 18:
                    crop = "16x9";
                    break;
                case 8:
                    crop = "3x4";
                    break;
                case 10:
                    crop = "1x1";
                    break;
                default:
                    crop = "original";
            }
            return crop;
        }
        else {
            return "16x9"
        }
    }