I believe you said image_dic is not required. The only place I see it is here : ```py def __array_ufunc__(self, ufunc, method, *inputs, **kwargs) -> App: if method == "__call__": # Converting potential pyotb inputs to arrays arrays = [] image_dic = None for inp in inputs: if isinstance(inp, (float, int, np.ndarray, np.generic)): arrays.append(inp) elif isinstance(inp, OTBObject): image_dic = inp.export() arrays.append(image_dic["array"]) else: logger.debug(type(self)) return NotImplemented # Performing the numpy operation result_array = ufunc(*arrays, **kwargs) result_dic = image_dic result_dic["array"] = result_array # Importing back to OTB, pass the result_dic just to keep reference pyotb_app = App("ExtractROI", image_dic=result_dic, frozen=True, quiet=True) if result_array.shape[2] == 1: pyotb_app.app.ImportImage("in", result_dic) else: pyotb_app.app.ImportVectorImage("in", result_dic) pyotb_app.execute() return pyotb_app ``` In App it does nothing. If possible we should remove it from App. What is this reference ? If image_dic is just numpy data, is it required to keep the ref after we call `ImportImage` ? What about https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/-/issues/1824 ?