code: public Observable<ServiceResponse<List<Image>>> getUntaggedImagesWithServiceResponseAsync(UUID projectId, UUID iterationId, String orderBy, Integer take, Integer skip) {
          if (projectId == null) {
              throw new IllegalArgumentException("Parameter projectId is required and cannot be null.");
          }
          if (this.client.apiKey() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiKey() is required and cannot be null.");
          }
          return service.getUntaggedImages(projectId, iterationId, orderBy, take, skip, this.client.apiKey(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<List<Image>>>>() {
                  @Override
                  public Observable<ServiceResponse<List<Image>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<List<Image>> clientResponse = getUntaggedImagesDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Get untagged images for a given project iteration.
  This API supports batching and range selection. By default it will only return first 50 images matching images.
  Use the {take} and {skip} parameters to control how many images to return in a given batch.
  
  @param projectId The project id
  @param iterationId The iteration id. Defaults to workspace
  @param orderBy The ordering. Defaults to newest. Possible values include: 'Newest', 'Oldest'
  @param take Maximum number of images to return. Defaults to 50, limited to 256
  @param skip Number of images to skip before beginning the image batch. Defaults to 0
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;Image&gt; object