code: @Override
    protected Set<RenditionMetadata> postProcessCandidates(Set<RenditionMetadata> candidates) {
      NavigableSet<RenditionMetadata> processedCandidates = new TreeSet<>(candidates);
      if (cropDimension != null) {
        VirtualTransformedRenditionMetadata cropRendition = getCropRendition(processedCandidates);
        if (cropRendition != null) {
          // return only cropped rendition
          processedCandidates.clear();
          processedCandidates.add(cropRendition);
          return processedCandidates;
        }
      }
      return rotateSourceRenditions(processedCandidates);
    }
docs: Searches for the biggest web enabled rendition and, if exists,
  adds a {@link VirtualTransformedRenditionMetadata} to the list.
  @param candidates
  @return {@link Set} of {@link RenditionMetadata}