concurrent.futures.process._RemoteTraceback:
"""
Traceback (most recent call last):
File "/usr/lib/python3.10/concurrent/futures/process.py", line 243, in _process_worker
r = call_item.fn(*call_item.args, **call_item.kwargs)
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_sync.py", line 192, in exec_page_sync
ocr_image, preprocess_out = make_intermediate_images(
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_sync.py", line 135, in make_intermediate_images
preprocess_out = preprocess(
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_sync.py", line 104, in preprocess
image = preprocess_remove_background(image, page_context)
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_pipeline.py", line 469, in preprocess_remove_background
raise NotImplementedError("--remove-background is temporarily not implemented")
NotImplementedError: --remove-background is temporarily not implemented
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_sync.py", line 385, in run_pipeline
exec_concurrent(context, executor)
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_sync.py", line 274, in exec_concurrent
executor(
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/_concurrent.py", line 82, in __call__
self._execute(
File "/home/vitus/.local/lib/python3.10/site-packages/ocrmypdf/builtin_plugins/concurrency.py", line 135, in _execute
result = future.result()
File "/usr/lib/python3.10/concurrent/futures/_base.py", line 438, in result
return self.__get_result()
File "/usr/lib/python3.10/concurrent/futures/_base.py", line 390, in __get_result
raise self._exception
NotImplementedError: --remove-background is temporarily not implemented```

It seems to be irrespective of the pdf file I put in. I have installed ocrmypdf via `pip` because the arch package could not install; for some reason, `python-humanfriendly` could not be detected there.