Pillow/Tests/test_image_histogram.py

from .helper import PillowTestCase, hopper


class TestImageHistogram(PillowTestCase):

    def test_histogram(self):

        def histogram(mode):
            h = hopper(mode).histogram()
            return len(h), min(h), max(h)

        self.assertEqual(histogram("1"), (256, 0, 10994))
        self.assertEqual(histogram("L"), (256, 0, 638))
        self.assertEqual(histogram("I"), (256, 0, 638))
        self.assertEqual(histogram("F"), (256, 0, 638))
        self.assertEqual(histogram("P"), (256, 0, 1871))
        self.assertEqual(histogram("RGB"), (768, 4, 675))
        self.assertEqual(histogram("RGBA"), (1024, 0, 16384))
        self.assertEqual(histogram("CMYK"), (1024, 0, 16384))
        self.assertEqual(histogram("YCbCr"), (768, 0, 1908))