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TestReducingGapResize

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Alexander 2019-12-20 17:10:40 +03:00
parent b48996c213
commit a9d7a2be77
2 changed files with 114 additions and 0 deletions
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87
Tests/test_image_resize.py
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@ -136,6 +136,93 @@ class TestImagingCoreResize(PillowTestCase):
self.assertRaises(ValueError, self.resize, hopper(), (10, 10), 9) self.assertRaises(ValueError, self.resize, hopper(), (10, 10), 9)
class TestReducingGapResize(PillowTestCase):
@classmethod
def setUpClass(cls):
cls.gradients_image = Image.open("Tests/images/radial_gradients.png")
cls.gradients_image.load()
def test_reducing_gap_values(self):
ref = self.gradients_image.resize((52, 34), Image.BICUBIC, reducing_gap=None)
im = self.gradients_image.resize((52, 34), Image.BICUBIC)
self.assert_image_equal(ref, im)
with self.assertRaises(ValueError):
self.gradients_image.resize((52, 34), Image.BICUBIC, reducing_gap=0)
with self.assertRaises(ValueError):
self.gradients_image.resize((52, 34), Image.BICUBIC, reducing_gap=0.99)
def test_reducing_gap_1(self):
for box, epsilon in [
(None, 4),
((1.1, 2.2, 510.8, 510.9), 4),
((3, 10, 410, 256), 10),
]:
ref = self.gradients_image.resize((52, 34), Image.BICUBIC, box=box)
im = self.gradients_image.resize(
(52, 34), Image.BICUBIC, box=box, reducing_gap=1.0
)
with self.assertRaises(AssertionError):
self.assert_image_equal(ref, im)
self.assert_image_similar(ref, im, epsilon)
def test_reducing_gap_2(self):
for box, epsilon in [
(None, 1.5),
((1.1, 2.2, 510.8, 510.9), 1.5),
((3, 10, 410, 256), 1),
]:
ref = self.gradients_image.resize((52, 34), Image.BICUBIC, box=box)
im = self.gradients_image.resize(
(52, 34), Image.BICUBIC, box=box, reducing_gap=2.0
)
with self.assertRaises(AssertionError):
self.assert_image_equal(ref, im)
self.assert_image_similar(ref, im, epsilon)
def test_reducing_gap_3(self):
for box, epsilon in [
(None, 1),
((1.1, 2.2, 510.8, 510.9), 1),
((3, 10, 410, 256), .5),
]:
ref = self.gradients_image.resize((52, 34), Image.BICUBIC, box=box)
im = self.gradients_image.resize(
(52, 34), Image.BICUBIC, box=box, reducing_gap=3.0
)
with self.assertRaises(AssertionError):
self.assert_image_equal(ref, im)
self.assert_image_similar(ref, im, epsilon)
def test_reducing_gap_8(self):
for box in [None, (1.1, 2.2, 510.8, 510.9), (3, 10, 410, 256)]:
ref = self.gradients_image.resize((52, 34), Image.BICUBIC, box=box)
im = self.gradients_image.resize(
(52, 34), Image.BICUBIC, box=box, reducing_gap=8.0
)
self.assert_image_equal(ref, im)
def test_box_filter(self):
for box, epsilon in [
((0, 0, 512, 512), 5.5),
((0.9, 1.7, 128, 128), 9.5),
]:
ref = self.gradients_image.resize((52, 34), Image.BOX, box=box)
im = self.gradients_image.resize(
(52, 34), Image.BOX, box=box, reducing_gap=1.0
)
self.assert_image_similar(ref, im, epsilon)
class TestImageResize(PillowTestCase): class TestImageResize(PillowTestCase):
def test_resize(self): def test_resize(self):
def resize(mode, size): def resize(mode, size):

27
Tests/test_image_thumbnail.py
View File

@ -66,3 +66,30 @@ class TestImageThumbnail(PillowTestCase):
ref = im.resize((32, 32), Image.BICUBIC) ref = im.resize((32, 32), Image.BICUBIC)
# This is still JPEG, some error is present. Without the fix it is 11.5 # This is still JPEG, some error is present. Without the fix it is 11.5
self.assert_image_similar(thumb, ref, 1.5) self.assert_image_similar(thumb, ref, 1.5)
def test_reducing_gap_values(self):
im = hopper()
im.thumbnail((18, 18), Image.BICUBIC)
ref = hopper()
ref.thumbnail((18, 18), Image.BICUBIC, reducing_gap=2.0)
# reducing_gap=2.0 should be the default
self.assert_image_equal(ref, im)
ref = hopper()
ref.thumbnail((18, 18), Image.BICUBIC, reducing_gap=None)
with self.assertRaises(AssertionError):
self.assert_image_equal(ref, im)
self.assert_image_similar(ref, im, 3.5)
def test_reducing_gap_for_DCT_scaling(self):
with Image.open("Tests/images/hopper.jpg") as ref:
# thumbnail should call draft with reducing_gap scale
ref.draft(None, (18 * 3, 18 * 3))
ref = ref.resize((18, 18), Image.BICUBIC)
with Image.open("Tests/images/hopper.jpg") as im:
im.thumbnail((18, 18), Image.BICUBIC, reducing_gap=3.0)
self.assert_image_equal(ref, im)