var jpeg = fs.readFileSync('YIVR_0291_360.JPG');

var data = jpeg.toString("binary");
var metadata = piexifjs.load(data);

jimp.read('YIVR_0291_360.JPG', (err, img1) => {
  if (err) throw err;
  jimp.read('YIVR_0292_360.JPG', (err2, img2) => {
    if (err2) throw err2;
    img1.crop(0, 0, img1.bitmap.width, (img1.bitmap.height / 2));
    img2.composite(img1, 0, 0);
    img2.quality(100);
    img2.write('OUTPUT.JPG', () => {
      var exifStr = piexifjs.dump(metadata);
      var jpeg = fs.readFileSync('OUTPUT.JPG');

      var data2 = jpeg.toString("binary");

      var newData = piexifjs.insert(exifStr, data2);
      var newJpeg = new Buffer(newData, "binary");

      fs.writeFileSync('OUTPUT.JPG', newJpeg);
    });
  });
});