Pillow/Tests/test_image_convert.py

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from PIL import Image
from .helper import PillowTestCase, hopper
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class TestImageConvert(PillowTestCase):
def test_sanity(self):
def convert(im, mode):
out = im.convert(mode)
self.assertEqual(out.mode, mode)
self.assertEqual(out.size, im.size)
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modes = (
"1",
"L",
"LA",
"P",
"PA",
"I",
"F",
"RGB",
"RGBA",
"RGBX",
"CMYK",
"YCbCr",
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"HSV",
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)
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for mode in modes:
im = hopper(mode)
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for mode in modes:
convert(im, mode)
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# Check 0
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im = Image.new(mode, (0, 0))
for mode in modes:
convert(im, mode)
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def test_default(self):
im = hopper("P")
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self.assert_image(im, "P", im.size)
im = im.convert()
self.assert_image(im, "RGB", im.size)
im = im.convert()
self.assert_image(im, "RGB", im.size)
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# ref https://github.com/python-pillow/Pillow/issues/274
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def _test_float_conversion(self, im):
orig = im.getpixel((5, 5))
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converted = im.convert("F").getpixel((5, 5))
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self.assertEqual(orig, converted)
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def test_8bit(self):
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with Image.open("Tests/images/hopper.jpg") as im:
self._test_float_conversion(im.convert("L"))
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def test_16bit(self):
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with Image.open("Tests/images/16bit.cropped.tif") as im:
self._test_float_conversion(im)
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def test_16bit_workaround(self):
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with Image.open("Tests/images/16bit.cropped.tif") as im:
self._test_float_conversion(im.convert("I"))
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def test_rgba_p(self):
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im = hopper("RGBA")
im.putalpha(hopper("L"))
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converted = im.convert("P")
comparable = converted.convert("RGBA")
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self.assert_image_similar(im, comparable, 20)
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def test_trns_p(self):
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im = hopper("P")
im.info["transparency"] = 0
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f = self.tempfile("temp.png")
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im_l = im.convert("L")
self.assertEqual(im_l.info["transparency"], 0) # undone
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im_l.save(f)
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im_rgb = im.convert("RGB")
self.assertEqual(im_rgb.info["transparency"], (0, 0, 0)) # undone
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im_rgb.save(f)
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# ref https://github.com/python-pillow/Pillow/issues/664
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def test_trns_p_rgba(self):
# Arrange
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im = hopper("P")
im.info["transparency"] = 128
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# Act
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im_rgba = im.convert("RGBA")
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# Assert
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self.assertNotIn("transparency", im_rgba.info)
# https://github.com/python-pillow/Pillow/issues/2702
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self.assertIsNone(im_rgba.palette)
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def test_trns_l(self):
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im = hopper("L")
im.info["transparency"] = 128
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f = self.tempfile("temp.png")
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im_rgb = im.convert("RGB")
self.assertEqual(im_rgb.info["transparency"], (128, 128, 128)) # undone
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im_rgb.save(f)
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im_p = im.convert("P")
self.assertIn("transparency", im_p.info)
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im_p.save(f)
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im_p = self.assert_warning(UserWarning, im.convert, "P", palette=Image.ADAPTIVE)
self.assertNotIn("transparency", im_p.info)
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im_p.save(f)
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def test_trns_RGB(self):
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im = hopper("RGB")
im.info["transparency"] = im.getpixel((0, 0))
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f = self.tempfile("temp.png")
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im_l = im.convert("L")
self.assertEqual(im_l.info["transparency"], im_l.getpixel((0, 0))) # undone
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im_l.save(f)
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im_p = im.convert("P")
self.assertIn("transparency", im_p.info)
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im_p.save(f)
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im_rgba = im.convert("RGBA")
self.assertNotIn("transparency", im_rgba.info)
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im_rgba.save(f)
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im_p = self.assert_warning(UserWarning, im.convert, "P", palette=Image.ADAPTIVE)
self.assertNotIn("transparency", im_p.info)
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im_p.save(f)
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def test_gif_with_rgba_palette_to_p(self):
# See https://github.com/python-pillow/Pillow/issues/2433
Improve handling of file resources Follow Python's file object semantics. User code is responsible for closing resources (usually through a context manager) in a deterministic way. To achieve this, remove __del__ functions. These functions used to closed open file handlers in an attempt to silence Python ResourceWarnings. However, using __del__ has the following drawbacks: - __del__ isn't called until the object's reference count reaches 0. Therefore, resource handlers remain open or in use longer than necessary. - The __del__ method isn't guaranteed to execute on system exit. See the Python documentation: https://docs.python.org/3/reference/datamodel.html#object.__del__ > It is not guaranteed that __del__() methods are called for objects > that still exist when the interpreter exits. - Exceptions that occur inside __del__ are ignored instead of raised. This has the potential of hiding bugs. This is also in the Python documentation: > Warning: Due to the precarious circumstances under which __del__() > methods are invoked, exceptions that occur during their execution > are ignored, and a warning is printed to sys.stderr instead. Instead, always close resource handlers when they are no longer in use. This will close the file handler at a specified point in the user's code and not wait until the interpreter chooses to. It is always guaranteed to run. And, if an exception occurs while closing the file handler, the bug will not be ignored. Now, when code receives a ResourceWarning, it will highlight an area that is mishandling resources. It should not simply be silenced, but fixed by closing resources with a context manager. All warnings that were emitted during tests have been cleaned up. To enable warnings, I passed the `-Wa` CLI option to Python. This exposed some mishandling of resources in ImageFile.__init__() and SpiderImagePlugin.loadImageSeries(), they too were fixed.
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with Image.open("Tests/images/hopper.gif") as im:
im.info["transparency"] = 255
im.load()
self.assertEqual(im.palette.mode, "RGBA")
im_p = im.convert("P")
# Should not raise ValueError: unrecognized raw mode
im_p.load()
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def test_p_la(self):
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im = hopper("RGBA")
alpha = hopper("L")
im.putalpha(alpha)
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comparable = im.convert("P").convert("LA").getchannel("A")
self.assert_image_similar(alpha, comparable, 5)
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def test_matrix_illegal_conversion(self):
# Arrange
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im = hopper("CMYK")
# fmt: off
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matrix = (
0.412453, 0.357580, 0.180423, 0,
0.212671, 0.715160, 0.072169, 0,
0.019334, 0.119193, 0.950227, 0)
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# fmt: on
self.assertNotEqual(im.mode, "RGB")
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# Act / Assert
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self.assertRaises(ValueError, im.convert, mode="CMYK", matrix=matrix)
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def test_matrix_wrong_mode(self):
# Arrange
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im = hopper("L")
# fmt: off
matrix = (
0.412453, 0.357580, 0.180423, 0,
0.212671, 0.715160, 0.072169, 0,
0.019334, 0.119193, 0.950227, 0)
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# fmt: on
self.assertEqual(im.mode, "L")
# Act / Assert
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self.assertRaises(ValueError, im.convert, mode="L", matrix=matrix)
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def test_matrix_xyz(self):
def matrix_convert(mode):
# Arrange
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im = hopper("RGB")
im.info["transparency"] = (255, 0, 0)
# fmt: off
matrix = (
0.412453, 0.357580, 0.180423, 0,
0.212671, 0.715160, 0.072169, 0,
0.019334, 0.119193, 0.950227, 0)
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# fmt: on
self.assertEqual(im.mode, "RGB")
# Act
# Convert an RGB image to the CIE XYZ colour space
converted_im = im.convert(mode=mode, matrix=matrix)
# Assert
self.assertEqual(converted_im.mode, mode)
self.assertEqual(converted_im.size, im.size)
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with Image.open("Tests/images/hopper-XYZ.png") as target:
if converted_im.mode == "RGB":
self.assert_image_similar(converted_im, target, 3)
self.assertEqual(converted_im.info["transparency"], (105, 54, 4))
else:
self.assert_image_similar(converted_im, target.getchannel(0), 1)
self.assertEqual(converted_im.info["transparency"], 105)
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matrix_convert("RGB")
matrix_convert("L")
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def test_matrix_identity(self):
# Arrange
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im = hopper("RGB")
# fmt: off
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identity_matrix = (
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0)
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# fmt: on
self.assertEqual(im.mode, "RGB")
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# Act
# Convert with an identity matrix
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converted_im = im.convert(mode="RGB", matrix=identity_matrix)
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# Assert
# No change
self.assert_image_equal(converted_im, im)