Merge pull request #136 from mcara/fix-bitmask-dtype-np1p21compat

Improve bitmask compatibility with numpy 1.21
spacetelescope · Aug 11, 2021 · 39c4793 · 39c4793
2 parents b00470b + f890f2f
commit 39c4793
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -20,6 +20,8 @@ of the list).
 
 - ``astropy`` 2 or later is now required. [#121]
 
+- Improved compatibility of the ``bitmask`` module with ``numpy 1.21``. [#136]
+
 3.6.0 (2019-07-17)
 ------------------
 

diff --git a/lib/stsci/tools/bitmask.py b/lib/stsci/tools/bitmask.py
@@ -416,7 +416,7 @@ def bitfield_to_boolean_mask(bitfield, ignore_flags=0, flip_bits=None,
     ignore_mask = ignore_mask & SUPPORTED_FLAGS
 
     # invert the "ignore" mask:
-    ignore_mask = np.bitwise_not(ignore_mask, dtype=bitfield.dtype,
+    ignore_mask = np.bitwise_not(ignore_mask, dtype=bitfield.dtype.type,
                                  casting='unsafe')
 
     mask = np.empty_like(bitfield, dtype=np.bool_)