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249 lines
7.0 KiB
Python
249 lines
7.0 KiB
Python
import pytest
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from PIL import Image
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from .helper import (
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PillowTestCase,
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assert_image,
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assert_image_equal,
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assert_image_similar,
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hopper,
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)
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class TestImageConvert(PillowTestCase):
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def test_sanity(self):
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def convert(im, mode):
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out = im.convert(mode)
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self.assertEqual(out.mode, mode)
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self.assertEqual(out.size, im.size)
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modes = (
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"1",
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"L",
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"LA",
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"P",
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"PA",
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"I",
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"F",
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"RGB",
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"RGBA",
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"RGBX",
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"CMYK",
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"YCbCr",
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"HSV",
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)
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for mode in modes:
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im = hopper(mode)
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for mode in modes:
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convert(im, mode)
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# Check 0
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im = Image.new(mode, (0, 0))
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for mode in modes:
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convert(im, mode)
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def test_default(self):
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im = hopper("P")
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assert_image(im, "P", im.size)
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im = im.convert()
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assert_image(im, "RGB", im.size)
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im = im.convert()
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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):
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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:
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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:
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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:
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self._test_float_conversion(im.convert("I"))
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def test_rgba_p(self):
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im = hopper("RGBA")
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im.putalpha(hopper("L"))
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converted = im.convert("P")
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comparable = converted.convert("RGBA")
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assert_image_similar(im, comparable, 20)
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def test_trns_p(self):
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im = hopper("P")
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im.info["transparency"] = 0
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f = self.tempfile("temp.png")
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im_l = im.convert("L")
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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")
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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):
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# Arrange
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im = hopper("P")
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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)
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# 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")
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im.info["transparency"] = 128
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f = self.tempfile("temp.png")
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im_rgb = im.convert("RGB")
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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")
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self.assertIn("transparency", im_p.info)
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im_p.save(f)
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im_p = pytest.warns(UserWarning, im.convert, "P", palette=Image.ADAPTIVE)
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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")
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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")
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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")
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self.assertIn("transparency", im_p.info)
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im_p.save(f)
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im_rgba = im.convert("RGBA")
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self.assertNotIn("transparency", im_rgba.info)
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im_rgba.save(f)
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im_p = pytest.warns(UserWarning, im.convert, "P", palette=Image.ADAPTIVE)
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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):
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# See https://github.com/python-pillow/Pillow/issues/2433
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with Image.open("Tests/images/hopper.gif") as im:
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im.info["transparency"] = 255
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im.load()
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self.assertEqual(im.palette.mode, "RGBA")
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im_p = im.convert("P")
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# Should not raise ValueError: unrecognized raw mode
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im_p.load()
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def test_p_la(self):
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im = hopper("RGBA")
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alpha = hopper("L")
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im.putalpha(alpha)
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comparable = im.convert("P").convert("LA").getchannel("A")
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assert_image_similar(alpha, comparable, 5)
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def test_matrix_illegal_conversion(self):
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# Arrange
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im = hopper("CMYK")
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# fmt: off
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matrix = (
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0.412453, 0.357580, 0.180423, 0,
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0.212671, 0.715160, 0.072169, 0,
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0.019334, 0.119193, 0.950227, 0)
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# fmt: on
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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):
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# Arrange
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im = hopper("L")
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# fmt: off
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matrix = (
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0.412453, 0.357580, 0.180423, 0,
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0.212671, 0.715160, 0.072169, 0,
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0.019334, 0.119193, 0.950227, 0)
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# fmt: on
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self.assertEqual(im.mode, "L")
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# Act / Assert
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self.assertRaises(ValueError, im.convert, mode="L", matrix=matrix)
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def test_matrix_xyz(self):
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def matrix_convert(mode):
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# Arrange
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im = hopper("RGB")
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im.info["transparency"] = (255, 0, 0)
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# fmt: off
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matrix = (
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0.412453, 0.357580, 0.180423, 0,
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0.212671, 0.715160, 0.072169, 0,
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0.019334, 0.119193, 0.950227, 0)
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# fmt: on
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self.assertEqual(im.mode, "RGB")
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# Act
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# Convert an RGB image to the CIE XYZ colour space
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converted_im = im.convert(mode=mode, matrix=matrix)
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# Assert
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self.assertEqual(converted_im.mode, mode)
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self.assertEqual(converted_im.size, im.size)
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with Image.open("Tests/images/hopper-XYZ.png") as target:
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if converted_im.mode == "RGB":
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assert_image_similar(converted_im, target, 3)
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self.assertEqual(converted_im.info["transparency"], (105, 54, 4))
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else:
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assert_image_similar(converted_im, target.getchannel(0), 1)
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self.assertEqual(converted_im.info["transparency"], 105)
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matrix_convert("RGB")
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matrix_convert("L")
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def test_matrix_identity(self):
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# Arrange
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im = hopper("RGB")
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# fmt: off
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identity_matrix = (
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1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0)
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# fmt: on
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self.assertEqual(im.mode, "RGB")
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# Act
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# Convert with an identity matrix
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converted_im = im.convert(mode="RGB", matrix=identity_matrix)
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# Assert
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# No change
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assert_image_equal(converted_im, im)
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