    static CImg<T> get_load_inr(const char *const filename, float *const voxel_size=0) {
      return CImg<T>().load_inr(filename,voxel_size);
    }
    static CImg<T> get_load_inr(const char *const filename, float *const voxel_size=0) {
      return CImg<T>().load_inr(filename,voxel_size);
    }