rootNode.put("@context", "http://library.stanford.edu/iiif/image-api/1.1/context.json");
rootNode.put("@id", aService + "/" + aPrefix + "/" + id);
rootNode.put("width", getWidth());
rootNode.put("height", getHeight());
scaleFactors = rootNode.arrayNode();
for (int index = 0; index < myLevel; index++) {
scaleFactors.add(index + 1);
}