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Set default resize sampling for I;16* images to BICUBIC

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This commit is contained in:
Andrew Murray 2024-09-28 15:35:42 +10:00
parent 04a00d273c
commit d33270ab51
3 changed files with 12 additions and 11 deletions
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8
Tests/test_image_resize.py
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@ -315,14 +315,14 @@ class TestImageResize:
im = im.resize((64, 64)) im = im.resize((64, 64))
assert im.size == (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: def test_default_filter_bicubic(self, mode: str) -> None:
im = hopper(mode) im = hopper(mode)
assert im.resize((20, 20), Image.Resampling.BICUBIC) == im.resize((20, 20)) assert im.resize((20, 20), Image.Resampling.BICUBIC) == im.resize((20, 20))
@pytest.mark.parametrize( @pytest.mark.parametrize("mode", ("1", "P", "BGR;15", "BGR;16"))
"mode", ("1", "P", "I;16", "I;16L", "I;16B", "BGR;15", "BGR;16")
)
def test_default_filter_nearest(self, mode: str) -> None: def test_default_filter_nearest(self, mode: str) -> None:
im = hopper(mode) im = hopper(mode)
assert im.resize((20, 20), Image.Resampling.NEAREST) == im.resize((20, 20)) assert im.resize((20, 20), Image.Resampling.NEAREST) == im.resize((20, 20))

7
docs/releasenotes/11.0.0.rst
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@ -119,10 +119,11 @@ Specific WebP Feature Checks
API Changes 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 API Additions
============= =============

8
src/PIL/Image.py
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@ -2278,8 +2278,8 @@ class Image:
:py:data:`Resampling.BILINEAR`, :py:data:`Resampling.HAMMING`, :py:data:`Resampling.BILINEAR`, :py:data:`Resampling.HAMMING`,
:py:data:`Resampling.BICUBIC` or :py:data:`Resampling.LANCZOS`. :py:data:`Resampling.BICUBIC` or :py:data:`Resampling.LANCZOS`.
If the image has mode "1" or "P", it is always set to If the image has mode "1" or "P", it is always set to
:py:data:`Resampling.NEAREST`. If the image mode specifies a number :py:data:`Resampling.NEAREST`. If the image mode is "BGR;15",
of bits, such as "I;16", then the default filter is "BGR;16" or "BGR;24", then the default filter is
:py:data:`Resampling.NEAREST`. Otherwise, the default filter is :py:data:`Resampling.NEAREST`. Otherwise, the default filter is
:py:data:`Resampling.BICUBIC`. See: :ref:`concept-filters`. :py:data:`Resampling.BICUBIC`. See: :ref:`concept-filters`.
:param box: An optional 4-tuple of floats providing :param box: An optional 4-tuple of floats providing
@ -2302,8 +2302,8 @@ class Image:
""" """
if resample is None: if resample is None:
type_special = ";" in self.mode bgr = self.mode.startswith("BGR;")
resample = Resampling.NEAREST if type_special else Resampling.BICUBIC resample = Resampling.NEAREST if bgr else Resampling.BICUBIC
elif resample not in ( elif resample not in (
Resampling.NEAREST, Resampling.NEAREST,
Resampling.BILINEAR, Resampling.BILINEAR,