Add is_16bit method

Detects signed and unsigned 16-bit image types in images.

pytools/meta.py

@@ -32,4 +32,17 @@ def is_int16(file_path: PathType) -> bool:
     return _make_image_file_reader_with_info(file_path).GetPixelID() == sitk.sitkInt16
 
 
-__all__ = ["is_int16"]
+def is_16bit(file_path: PathType) -> bool:
+    """
+    Read an image file header to inspect meta-data.
+
+    Supported file formats include TIFF, and others supported by SimpleITK and the Insight toolkit.
+
+    :param file_path: The path to an image file.
+    :returns: True if the pixel type is a 16-bit integer (signed or unsigned), False otherwise.
+
+    """
+    return _make_image_file_reader_with_info(file_path).GetPixelID() in [sitk.sitkInt16, sitk.sitkUInt16]
+
+
+__all__ = ["is_int16", "is_16bit"]

test/test_meta.py

@@ -11,7 +11,7 @@
 #  limitations under the License.
 #
 
-from pytools.meta import is_int16
+from pytools.meta import is_int16, is_16bit
 import pytest
 import SimpleITK as sitk
 
@@ -43,3 +43,18 @@ def test_is_int16_mrc(image_mrc, expected_result):
 )
 def test_is_int16_tif(image_tiff, expected_result):
     assert is_int16(image_tiff) == expected_result
+
+
+@pytest.mark.parametrize(
+    "image_tiff,expected_result",
+    [
+        (sitk.sitkUInt8, False),
+        (sitk.sitkInt8, False),
+        (sitk.sitkInt16, True),
+        (sitk.sitkUInt16, True),
+        (sitk.sitkFloat32, False),
+    ],
+    indirect=["image_tiff"],
+)
+def test_is_16bit_tif(image_tiff, expected_result):
+    assert is_16bit(image_tiff) == expected_result