Pillow/Tests/test_imageops_usm.py
2020-02-23 00:06:21 +11:00

99 lines
3.1 KiB
Python

import pytest
from PIL import Image, ImageFilter
from .helper import PillowTestCase
class TestImageOpsUsm(PillowTestCase):
def setUp(self):
super().setUp()
self.im = Image.open("Tests/images/hopper.ppm")
self.addCleanup(self.im.close)
self.snakes = Image.open("Tests/images/color_snakes.png")
self.addCleanup(self.snakes.close)
def test_filter_api(self):
test_filter = ImageFilter.GaussianBlur(2.0)
i = self.im.filter(test_filter)
assert i.mode == "RGB"
assert i.size == (128, 128)
test_filter = ImageFilter.UnsharpMask(2.0, 125, 8)
i = self.im.filter(test_filter)
assert i.mode == "RGB"
assert i.size == (128, 128)
def test_usm_formats(self):
usm = ImageFilter.UnsharpMask
with pytest.raises(ValueError):
self.im.convert("1").filter(usm)
self.im.convert("L").filter(usm)
with pytest.raises(ValueError):
self.im.convert("I").filter(usm)
with pytest.raises(ValueError):
self.im.convert("F").filter(usm)
self.im.convert("RGB").filter(usm)
self.im.convert("RGBA").filter(usm)
self.im.convert("CMYK").filter(usm)
with pytest.raises(ValueError):
self.im.convert("YCbCr").filter(usm)
def test_blur_formats(self):
blur = ImageFilter.GaussianBlur
with pytest.raises(ValueError):
self.im.convert("1").filter(blur)
blur(self.im.convert("L"))
with pytest.raises(ValueError):
self.im.convert("I").filter(blur)
with pytest.raises(ValueError):
self.im.convert("F").filter(blur)
self.im.convert("RGB").filter(blur)
self.im.convert("RGBA").filter(blur)
self.im.convert("CMYK").filter(blur)
with pytest.raises(ValueError):
self.im.convert("YCbCr").filter(blur)
def test_usm_accuracy(self):
src = self.snakes.convert("RGB")
i = src.filter(ImageFilter.UnsharpMask(5, 1024, 0))
# Image should not be changed because it have only 0 and 255 levels.
assert i.tobytes() == src.tobytes()
def test_blur_accuracy(self):
i = self.snakes.filter(ImageFilter.GaussianBlur(0.4))
# These pixels surrounded with pixels with 255 intensity.
# They must be very close to 255.
for x, y, c in [
(1, 0, 1),
(2, 0, 1),
(7, 8, 1),
(8, 8, 1),
(2, 9, 1),
(7, 3, 0),
(8, 3, 0),
(5, 8, 0),
(5, 9, 0),
(1, 3, 0),
(4, 3, 2),
(4, 2, 2),
]:
assert i.im.getpixel((x, y))[c] >= 250
# Fuzzy match.
def gp(x, y):
return i.im.getpixel((x, y))
assert 236 <= gp(7, 4)[0] <= 239
assert 236 <= gp(7, 5)[2] <= 239
assert 236 <= gp(7, 6)[2] <= 239
assert 236 <= gp(7, 7)[1] <= 239
assert 236 <= gp(8, 4)[0] <= 239
assert 236 <= gp(8, 5)[2] <= 239
assert 236 <= gp(8, 6)[2] <= 239
assert 236 <= gp(8, 7)[1] <= 239