code: public boolean removeTag(String tagName) {
      boolean result = false;
      IFD ifd = firstIFD;
      while (ifd != null) {
        if (ifd.containsTagId(TiffTags.getTagId(tagName))) {
          ifd.removeTag(tagName);
        }
        ifd = ifd.getNextIFD();
      }
      createMetadataDictionary();
      return result;
    }
docs: Removes the tag.
  
  @param tagName the tag name
  @return true, if successful