message: BUG: progress event attached to wrong ramp filter with cuda
  Fixes
diff: @@ -101,6 +101,11 @@ main(int argc, char * argv[])
  {
  using PercentageProgressCommandType = rtk::PercentageProgressCommand<CPURampFilterType>;
  PercentageProgressCommandType::Pointer progressCommand = PercentageProgressCommandType::New();
  +#ifdef RTK_USE_CUDA
  + if (!strcmp(args_info.hardware_arg, "cuda"))
  + cudaRampFilter->AddObserver(itk::ProgressEvent(), progressCommand);
  + else
  +#endif
  rampFilter->AddObserver(itk::ProgressEvent(), progressCommand);
  }
  