create_icon_img.js

    function resize (cb) {
        if (index === images.length) {
            cb();
            return;
        }

        var img = images[index++];
        gm(img).resize(70, 70)
            .borderColor('transparent')
            .border(2, 2)
            .noProfile()
            .write(path.join(pathTmp, path.basename(img)), function () {
                gm(img).resize(70, 70)
                    .borderColor('transparent')
                    .border(2, 2)
                    .noProfile()
                    .contrast(2)
                    .colorspace('GRAY')
                    .write(path.join(pathTmp, '_' + path.basename(img)), resize.bind(null, cb));
            });
    }