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For special image modes, revert default resize resampling to NEAREST

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This commit is contained in:
Andrew Murray 2021-04-17 12:18:42 +10:00
parent 9b6fe1b039
commit 7c0344bb99
2 changed files with 14 additions and 5 deletions
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4
Tests/test_image_resize.py
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@ -250,3 +250,7 @@ class TestImageResize:
for mode in "1", "P":
im = hopper(mode)
assert im.resize((20, 20), Image.NEAREST) == im.resize((20, 20))
for mode in "I;16", "I;16L", "I;16B", "BGR;15", "BGR;16":
im = hopper(mode)
assert im.resize((20, 20), Image.NEAREST) == im.resize((20, 20))

15
src/PIL/Image.py
View File

@ -1849,7 +1849,7 @@ class Image:
min(self.size[1], math.ceil(box[3] + support_y)),
)
def resize(self, size, resample=BICUBIC, box=None, reducing_gap=None):
def resize(self, size, resample=None, box=None, reducing_gap=None):
"""
Returns a resized copy of this image.
@ -1859,9 +1859,11 @@ class Image:
one of :py:data:`PIL.Image.NEAREST`, :py:data:`PIL.Image.BOX`,
:py:data:`PIL.Image.BILINEAR`, :py:data:`PIL.Image.HAMMING`,
:py:data:`PIL.Image.BICUBIC` or :py:data:`PIL.Image.LANCZOS`.
Default filter is :py:data:`PIL.Image.BICUBIC`.
If the image has mode "1" or "P", it is
always set to :py:data:`PIL.Image.NEAREST`.
If the image has mode "1" or "P", it is always set to
:py:data:`PIL.Image.NEAREST`.
If the image mode specifies a number of bits, such as "I;16", then the
default filter is :py:data:`PIL.Image.NEAREST`.
Otherwise, the default filter is :py:data:`PIL.Image.BICUBIC`.
See: :ref:`concept-filters`.
:param box: An optional 4-tuple of floats providing
the source image region to be scaled.
@ -1882,7 +1884,10 @@ class Image:
:returns: An :py:class:`~PIL.Image.Image` object.
"""
if resample not in (NEAREST, BILINEAR, BICUBIC, LANCZOS, BOX, HAMMING):
if resample is None:
type_special = ";" in self.mode
resample = NEAREST if type_special else BICUBIC
elif resample not in (NEAREST, BILINEAR, BICUBIC, LANCZOS, BOX, HAMMING):
message = f"Unknown resampling filter ({resample})."
filters = [