diff --git a/lib/matplotlib/tests/test_image.py b/lib/matplotlib/tests/test_image.py
index 00a5ccc1058c..ae02a5072723 100644
--- a/lib/matplotlib/tests/test_image.py
+++ b/lib/matplotlib/tests/test_image.py
@@ -1170,7 +1170,7 @@ def __getitem__(self, item):
def __array_ufunc__(self, ufunc, method, *inputs, **kwargs):
func = getattr(ufunc, method)
if "out" in kwargs:
- raise NotImplementedError
+ return NotImplemented
if len(inputs) == 1:
i0 = inputs[0]
unit = getattr(i0, "units", "dimensionless")
@@ -1190,11 +1190,16 @@ def __array_ufunc__(self, ufunc, method, *inputs, **kwargs):
unit = f"{u0}*{u1}"
elif ufunc == np.divide:
unit = f"{u0}/({u1})"
+ elif ufunc in (np.greater, np.greater_equal,
+ np.equal, np.not_equal,
+ np.less, np.less_equal):
+ # Comparisons produce unitless booleans for output
+ unit = None
else:
- raise NotImplementedError
+ return NotImplemented
out_arr = func(i0.view(np.ndarray), i1.view(np.ndarray), **kwargs)
else:
- raise NotImplementedError
+ return NotImplemented
if unit is None:
out_arr = np.array(out_arr)
else:
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