Pillow/Tests/test_image_getextrema.py

from PIL import Image
from .helper import unittest, PillowTestCase, hopper


class TestImageGetExtrema(PillowTestCase):

    def test_extrema(self):

        def extrema(mode):
            return hopper(mode).getextrema()

        self.assertEqual(extrema("1"), (0, 255))
        self.assertEqual(extrema("L"), (0, 255))
        self.assertEqual(extrema("I"), (0, 255))
        self.assertEqual(extrema("F"), (0, 255))
        self.assertEqual(extrema("P"), (0, 225))  # fixed palette
        self.assertEqual(
            extrema("RGB"), ((0, 255), (0, 255), (0, 255)))
        self.assertEqual(
            extrema("RGBA"), ((0, 255), (0, 255), (0, 255), (255, 255)))
        self.assertEqual(
            extrema("CMYK"), ((0, 255), (0, 255), (0, 255), (0, 0)))
        self.assertEqual(extrema("I;16"), (0, 255))

    def test_true_16(self):
        im = Image.open("Tests/images/16_bit_noise.tif")
        self.assertEqual(im.mode, 'I;16')
        extrema = im.getextrema()
        self.assertEqual(extrema, (106, 285))


if __name__ == '__main__':
    unittest.main()