static IMeta initIMeta(O o) {
  if (o == null) null;
  if (o cast IMeta) ret o;
  if (o cast JComponent) ret initMetaOfJComponent(o);
  
  // This is not really used. Try to use BufferedImageWithMeta instead
  if (o cast BufferedImage) ret optCast IMeta(o.getProperty("meta"));
  null;
}