I noticed that there is an issue when transforming an image from rectilinear projection to any other type of projection due to an issue on line 88 of photonbend\core\lens.py.

if theta < 0:
    raise ValueError("The angle theta cannot be negative")
if theta > to_radians(89):
    raise ValueError(
        "The Rectilinear lens can't handle FoV larger than 179 degrees"
    )
return np.tan(theta)

Specifically, the computation of theta for a rectilinear lens results in a multi-element array that cannot be compared to 0 or to_radians(89). It is unclear to me why theta is multi-element. However, deleting these checks from lens.py causes the expected transformation, as verified by viewing the original equidistant image and recomputed equidistant image from a rectilinear transformation.

Full error output:
(prosilica) C:\Users\tonyl\Downloads\photonbend-main\photonbend-main\examples>photonbend alter-photo --itype inscribed --otype inscribed --ilens rectilinear --olens equidistant --ifov 140 --ofov 360 rectlinear-full_new.jpg equidistant_new.jpg
Traceback (most recent call last):
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "C:\Users\tonyl\anaconda3\envs\prosilica\Scripts\photonbend.exe_main.py", line 7, in
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\click\core.py", line 1128, in call
return self.main(*args, **kwargs)
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\click\core.py", line 1053, in main
rv = self.invoke(ctx)
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\click\core.py", line 1659, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\click\core.py", line 1395, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\click\core.py", line 754, in invoke
return __callback(*args, **kwargs)
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\photonbend\scripts\commands\alter_photo.py", line 154, in alter_photo
mapped_array = source_image.process_coordinate_map(destiny_map)
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\photonbend\core\projection.py", line 220, in process_coordinate_map
positions_x, positions_y = self._make_cartesian_map(latitude, longitude)
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\photonbend\core\projection.py", line 251, in _make_cartesian_map
distance = self.forward_lens(latitude) * self.f_distance
File "C:\Users\tonyl\anaconda3\envs\prosilica\lib\site-packages\photonbend\core\lens.py", line 88, in _rectilinear
if theta < 0:
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Code to recreate:

photonbend alter-photo --itype inscribed --otype full --ilens equidistant --olens rectilinear --ifov 360 --ofov 140 equidistant.jpg rectlinear-full_new.jpg

photonbend alter-photo --itype full --otype inscribed --ilens rectilinear --olens equidistant --ifov 140 --ofov 360 rectlinear-full_new.jpg equidistant_new.jpg