1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
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}",
)
def test_alpha():
# Issue https://github.com/python-pillow/Pillow/issues/899
# Is alpha preserved through image enhancement?
original = _half_transparent_image()
for op in ["Color", "Brightness", "Contrast", "Sharpness"]:
for amount in [0, 0.5, 1.0]:
_check_alpha(
getattr(ImageEnhance, op)(original).enhance(amount),
original,
op,
amount,
)
|
