code: public String getSingleSize(CmsObject cms, String resPath) throws CmsException {
  
          CmsResource res = getClonedCmsObject(cms).readResource(resPath);
          return getSingleSize(cms, res);
      }
docs: Reads the size of a single image.<p>
  
  @param cms CmsObejct
  @param resPath Path of image (uri)
  @return a String representation of the dimension of the given image
  @throws CmsException if something goes wrong