mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-25 17:36:18 +03:00
60 lines
1.5 KiB
Python
60 lines
1.5 KiB
Python
from __future__ import annotations
|
|
|
|
import pytest
|
|
|
|
from PIL import Image, ImageEnhance
|
|
|
|
from .helper import assert_image_equal, hopper
|
|
|
|
|
|
def test_sanity():
|
|
# FIXME: assert_image
|
|
# Implicit asserts no exception:
|
|
ImageEnhance.Color(hopper()).enhance(0.5)
|
|
ImageEnhance.Contrast(hopper()).enhance(0.5)
|
|
ImageEnhance.Brightness(hopper()).enhance(0.5)
|
|
ImageEnhance.Sharpness(hopper()).enhance(0.5)
|
|
|
|
|
|
def test_crash():
|
|
# crashes on small images
|
|
im = Image.new("RGB", (1, 1))
|
|
ImageEnhance.Sharpness(im).enhance(0.5)
|
|
|
|
|
|
def _half_transparent_image():
|
|
# returns an image, half transparent, half solid
|
|
im = hopper("RGB")
|
|
|
|
transparent = Image.new("L", im.size, 0)
|
|
solid = Image.new("L", (im.size[0] // 2, im.size[1]), 255)
|
|
transparent.paste(solid, (0, 0))
|
|
im.putalpha(transparent)
|
|
|
|
return im
|
|
|
|
|
|
def _check_alpha(im, original, op, amount):
|
|
assert im.getbands() == original.getbands()
|
|
assert_image_equal(
|
|
im.getchannel("A"),
|
|
original.getchannel("A"),
|
|
f"Diff on {op}: {amount}",
|
|
)
|
|
|
|
|
|
@pytest.mark.parametrize("op", ("Color", "Brightness", "Contrast", "Sharpness"))
|
|
def test_alpha(op):
|
|
# Issue https://github.com/python-pillow/Pillow/issues/899
|
|
# Is alpha preserved through image enhancement?
|
|
|
|
original = _half_transparent_image()
|
|
|
|
for amount in [0, 0.5, 1.0]:
|
|
_check_alpha(
|
|
getattr(ImageEnhance, op)(original).enhance(amount),
|
|
original,
|
|
op,
|
|
amount,
|
|
)
|