static BufferedImage cloneBufferedImageWithMeta(BufferedImage img) {
  if (img == null) null;
  if (toIMeta(img) != null) ret img;
  
  new Hashtable<S, O> properties;
  var names = img.getPropertyNames();
  if (names != null) for (key : names)
    properties.put(key, img.getProperty(key));
  if (!properties.containsKey("meta"))
    properties.put(meta := new Meta);
    
  var cm = img.getColorModel();
  
  var img2 = new BufferedImage(cm,
    img.getRaster(),
    cm.hasAlpha() && cm.isAlphaPremultiplied(),
    properties);
  assertNotNull(toIMeta(img2));
  ret img2;
}