from imagecollection to image

// Helper function to convert image collection into stack of image bands
function newCollectionToImage(collection){
  var stack = ee.Image(collection.iterate(function(img, prev) {
    return ee.Image(prev).addBands(img);
  }, ee.Image(1)));

  stack = stack.select(ee.List.sequence(1, stack.bandNames().size().subtract(1)));
  return stack;
}