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68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
from PIL import Image
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from .helper import PillowTestCase, assert_image, assert_image_similar, hopper
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class TestImageQuantize(PillowTestCase):
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def test_sanity(self):
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image = hopper()
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converted = image.quantize()
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assert_image(converted, "P", converted.size)
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assert_image_similar(converted.convert("RGB"), image, 10)
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image = hopper()
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converted = image.quantize(palette=hopper("P"))
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assert_image(converted, "P", converted.size)
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assert_image_similar(converted.convert("RGB"), image, 60)
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def test_libimagequant_quantize(self):
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image = hopper()
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try:
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converted = image.quantize(100, Image.LIBIMAGEQUANT)
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except ValueError as ex:
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if "dependency" in str(ex).lower():
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self.skipTest("libimagequant support not available")
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else:
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raise
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assert_image(converted, "P", converted.size)
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assert_image_similar(converted.convert("RGB"), image, 15)
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self.assertEqual(len(converted.getcolors()), 100)
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def test_octree_quantize(self):
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image = hopper()
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converted = image.quantize(100, Image.FASTOCTREE)
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assert_image(converted, "P", converted.size)
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assert_image_similar(converted.convert("RGB"), image, 20)
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self.assertEqual(len(converted.getcolors()), 100)
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def test_rgba_quantize(self):
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image = hopper("RGBA")
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self.assertRaises(ValueError, image.quantize, method=0)
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self.assertEqual(image.quantize().convert().mode, "RGBA")
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def test_quantize(self):
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with Image.open("Tests/images/caption_6_33_22.png") as image:
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image = image.convert("RGB")
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converted = image.quantize()
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assert_image(converted, "P", converted.size)
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assert_image_similar(converted.convert("RGB"), image, 1)
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def test_quantize_no_dither(self):
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image = hopper()
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with Image.open("Tests/images/caption_6_33_22.png") as palette:
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palette = palette.convert("P")
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converted = image.quantize(dither=0, palette=palette)
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assert_image(converted, "P", converted.size)
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def test_quantize_dither_diff(self):
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image = hopper()
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with Image.open("Tests/images/caption_6_33_22.png") as palette:
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palette = palette.convert("P")
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dither = image.quantize(dither=1, palette=palette)
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nodither = image.quantize(dither=0, palette=palette)
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self.assertNotEqual(dither.tobytes(), nodither.tobytes())
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