Pillow/Tests/test_format_lab.py

from .helper import unittest, PillowTestCase

from PIL import Image


class TestFormatLab(PillowTestCase):

    def test_white(self):
        i = Image.open('Tests/images/lab.tif')

        i.load()

        self.assertEqual(i.mode, 'LAB')

        self.assertEqual(i.getbands(), ('L', 'A', 'B'))

        k = i.getpixel((0, 0))
        self.assertEqual(k, (255, 128, 128))

        L = i.getdata(0)
        a = i.getdata(1)
        b = i.getdata(2)

        self.assertEqual(list(L), [255]*100)
        self.assertEqual(list(a), [128]*100)
        self.assertEqual(list(b), [128]*100)

    def test_green(self):
        # l= 50 (/100), a = -100 (-128 .. 128) b=0 in PS
        # == RGB: 0, 152, 117
        i = Image.open('Tests/images/lab-green.tif')

        k = i.getpixel((0, 0))
        self.assertEqual(k, (128, 28, 128))

    def test_red(self):
        # l= 50 (/100), a = 100 (-128 .. 128) b=0 in PS
        # == RGB: 255, 0, 124
        i = Image.open('Tests/images/lab-red.tif')

        k = i.getpixel((0, 0))
        self.assertEqual(k, (128, 228, 128))


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