Pillow/Tests/test_image_split.py

from PIL import Image, features

from .helper import PillowTestCase, assert_image_equal, hopper


class TestImageSplit(PillowTestCase):
    def test_split(self):
        def split(mode):
            layers = hopper(mode).split()
            return [(i.mode, i.size[0], i.size[1]) for i in layers]

        assert split("1") == [("1", 128, 128)]
        assert split("L") == [("L", 128, 128)]
        assert split("I") == [("I", 128, 128)]
        assert split("F") == [("F", 128, 128)]
        assert split("P") == [("P", 128, 128)]
        assert split("RGB") == [("L", 128, 128), ("L", 128, 128), ("L", 128, 128)]
        assert split("RGBA") == [
            ("L", 128, 128),
            ("L", 128, 128),
            ("L", 128, 128),
            ("L", 128, 128),
        ]
        assert split("CMYK") == [
            ("L", 128, 128),
            ("L", 128, 128),
            ("L", 128, 128),
            ("L", 128, 128),
        ]
        assert split("YCbCr") == [("L", 128, 128), ("L", 128, 128), ("L", 128, 128)]

    def test_split_merge(self):
        def split_merge(mode):
            return Image.merge(mode, hopper(mode).split())

        assert_image_equal(hopper("1"), split_merge("1"))
        assert_image_equal(hopper("L"), split_merge("L"))
        assert_image_equal(hopper("I"), split_merge("I"))
        assert_image_equal(hopper("F"), split_merge("F"))
        assert_image_equal(hopper("P"), split_merge("P"))
        assert_image_equal(hopper("RGB"), split_merge("RGB"))
        assert_image_equal(hopper("RGBA"), split_merge("RGBA"))
        assert_image_equal(hopper("CMYK"), split_merge("CMYK"))
        assert_image_equal(hopper("YCbCr"), split_merge("YCbCr"))

    def test_split_open(self):
        if features.check("zlib"):
            test_file = self.tempfile("temp.png")
        else:
            test_file = self.tempfile("temp.pcx")

        def split_open(mode):
            hopper(mode).save(test_file)
            with Image.open(test_file) as im:
                return len(im.split())

        assert split_open("1") == 1
        assert split_open("L") == 1
        assert split_open("P") == 1
        assert split_open("RGB") == 3
        if features.check("zlib"):
            assert split_open("RGBA") == 4