Pillow/Tests/test_format_lab.py at d15c30a31e8a4aa8c27065ee750f8517660ecd7e · radarhere/Pillow · GitHub

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from __future__ import annotations

from PIL import Image


def test_white() -> None:
    with Image.open("Tests/images/lab.tif") as i:
        i.load()

        assert i.mode == "LAB"

        assert i.getbands() == ("L", "A", "B")

        k = i.getpixel((0, 0))

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

    assert k == (255, 128, 128)

    assert L == (255,) * 100
    assert a == (128,) * 100
    assert b == (128,) * 100


def test_green() -> None:
    # l= 50 (/100), a = -100 (-128 .. 128) b=0 in PS
    # == RGB: 0, 152, 117
    with Image.open("Tests/images/lab-green.tif") as i:
        k = i.getpixel((0, 0))
    assert k == (128, 28, 128)


def test_red() -> None:
    # l= 50 (/100), a = 100 (-128 .. 128) b=0 in PS
    # == RGB: 255, 0, 124
    with Image.open("Tests/images/lab-red.tif") as i:
        k = i.getpixel((0, 0))
    assert k == (128, 228, 128)