diff --git a/Tests/test_image_resize.py b/Tests/test_image_resize.py index 1cd9c3800..8548fb5da 100644 --- a/Tests/test_image_resize.py +++ b/Tests/test_image_resize.py @@ -315,14 +315,14 @@ class TestImageResize: im = im.resize((64, 64)) assert im.size == (64, 64) - @pytest.mark.parametrize("mode", ("L", "RGB", "I", "F")) + @pytest.mark.parametrize( + "mode", ("L", "RGB", "I", "I;16", "I;16L", "I;16B", "I;16N", "F") + ) def test_default_filter_bicubic(self, mode: str) -> None: im = hopper(mode) assert im.resize((20, 20), Image.Resampling.BICUBIC) == im.resize((20, 20)) - @pytest.mark.parametrize( - "mode", ("1", "P", "I;16", "I;16L", "I;16B", "BGR;15", "BGR;16") - ) + @pytest.mark.parametrize("mode", ("1", "P", "BGR;15", "BGR;16")) def test_default_filter_nearest(self, mode: str) -> None: im = hopper(mode) assert im.resize((20, 20), Image.Resampling.NEAREST) == im.resize((20, 20)) diff --git a/docs/releasenotes/11.0.0.rst b/docs/releasenotes/11.0.0.rst index 36334e39f..1218c5014 100644 --- a/docs/releasenotes/11.0.0.rst +++ b/docs/releasenotes/11.0.0.rst @@ -119,10 +119,11 @@ Specific WebP Feature Checks API Changes =========== -TODO -^^^^ +Default resampling filter for I;16* image modes +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -TODO +The default resampling filter for I;16, I;16L, I;16B and I;16N has been changed from +``Image.NEAREST`` to ``Image.BICUBIC``, to match the majority of modes. API Additions ============= diff --git a/src/PIL/Image.py b/src/PIL/Image.py index 3f94cef38..bf9079f8b 100644 --- a/src/PIL/Image.py +++ b/src/PIL/Image.py @@ -2278,8 +2278,8 @@ class Image: :py:data:`Resampling.BILINEAR`, :py:data:`Resampling.HAMMING`, :py:data:`Resampling.BICUBIC` or :py:data:`Resampling.LANCZOS`. If the image has mode "1" or "P", it is always set to - :py:data:`Resampling.NEAREST`. If the image mode specifies a number - of bits, such as "I;16", then the default filter is + :py:data:`Resampling.NEAREST`. If the image mode is "BGR;15", + "BGR;16" or "BGR;24", then the default filter is :py:data:`Resampling.NEAREST`. Otherwise, the default filter is :py:data:`Resampling.BICUBIC`. See: :ref:`concept-filters`. :param box: An optional 4-tuple of floats providing @@ -2302,8 +2302,8 @@ class Image: """ if resample is None: - type_special = ";" in self.mode - resample = Resampling.NEAREST if type_special else Resampling.BICUBIC + bgr = self.mode.startswith("BGR;") + resample = Resampling.NEAREST if bgr else Resampling.BICUBIC elif resample not in ( Resampling.NEAREST, Resampling.BILINEAR,