def test_compass(self):
for im in self.all_images:
for msk in self.all_masks:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
for times in range(1, 4):
convolved = im.compass(msk,
times=times,
angle=pyvips.Angle45.D45,
combine=pyvips.Combine.MAX,
precision=prec)
result = convolved(25, 50)
true = compass(im, msk, 24, 49, times, max)
assert_almost_equal_objects(result, true)
for im in self.all_images:
for msk in self.all_masks:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
for times in range(1, 4):
convolved = im.compass(msk,
times=times,
angle=pyvips.Angle45.D45,
combine=pyvips.Combine.SUM,
precision=prec)
result = convolved(25, 50)
true = compass(im, msk, 24, 49, times, operator.add)
assert_almost_equal_objects(result, true)
def test_buildlut(self):
M = pyvips.Image.new_from_array([[0, 0],
[255, 100]])
lut = M.buildlut()
assert lut.width == 256
assert lut.height == 1
assert lut.bands == 1
p = lut(0, 0)
assert p[0] == 0.0
p = lut(255, 0)
assert p[0] == 100.0
p = lut(10, 0)
assert p[0] == 100 * 10.0 / 255.0
M = pyvips.Image.new_from_array([[0, 0, 100],
[255, 100, 0],
[128, 10, 90]])
lut = M.buildlut()
assert lut.width == 256
assert lut.height == 1
assert lut.bands == 2
p = lut(0, 0)
assert_almost_equal_objects(p, [0.0, 100.0])
p = lut(64, 0)
assert_almost_equal_objects(p, [5.0, 95.0])
def png_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a, [38671.0, 33914.0, 26762.0])
assert im.width == 290
assert im.height == 442
assert im.bands == 3
assert im.get("xmp-data") == "sample xmp string"
def fits_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a, [-0.165013, -0.148553, 1.09122,
-0.942242], threshold=0.00001)
assert im.width == 200
assert im.height == 200
assert im.bands == 4
def test_xyz(self):
im = pyvips.Image.xyz(128, 128)
assert im.bands == 2
assert im.format == pyvips.BandFormat.UINT
assert im.width == 128
assert im.height == 128
p = im(45, 35)
assert_almost_equal_objects(p, [45, 35])
def heif_valid(im):
a = im(10, 10)
# different versions of HEIC decode have slightly different
# rounding
assert_almost_equal_objects(a, [197.0, 181.0, 158.0], threshold=2)
assert im.width == 3024
assert im.height == 4032
assert im.bands == 3
def jpeg_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a, [6, 5, 3])
profile = im.get("icc-profile-data")
assert len(profile) == 1352
assert im.width == 1024
assert im.height == 768
assert im.bands == 3
def jpeg_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a, [141, 127, 90])
profile = im.get("icc-profile-data")
assert len(profile) == 564
assert im.width == 290
assert im.height == 442
assert im.bands == 3
def test_composite(self):
# 50% transparent image
overlay = self.colour.bandjoin(128)
base = self.colour + 100
comp = base.composite(overlay, "over")
assert_almost_equal_objects(comp(0, 0), [51.8, 52.8, 53.8, 255],
threshold=0.1)
def webp_valid(im):
a = im(10, 10)
# different webp versions use different rounding systems leading
# to small variations
assert_almost_equal_objects(a, [71, 166, 236], threshold=2)
assert im.width == 550
assert im.height == 368
assert im.bands == 3
def tiff4_valid(im):
a = im(127, 0)
assert_almost_equal_objects(a, [119.0])
a = im(128, 0)
assert_almost_equal_objects(a, [136.0])
assert im.width == 256
assert im.height == 4
assert im.bands == 1
def exr_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a,
[0.124512, 0.159668, 0.040375, 255.0],
threshold=0.00001)
assert im.width == 610
assert im.height == 406
assert im.bands == 4
def test_composite(self):
# 50% transparent image
overlay = self.colour.bandjoin(128)
base = self.colour + 100
comp = base.composite(overlay, "over")
assert_almost_equal_objects(comp(0, 0), [51.8, 52.8, 53.8, 255],
threshold=0.1)
def fits_valid(im):
a = im(10, 10)
assert_almost_equal_objects(
a, [-0.165013, -0.148553, 1.09122, -0.942242],
threshold=0.00001)
assert im.width == 200
assert im.height == 200
assert im.bands == 4
def test_xyz(self):
im = pyvips.Image.xyz(128, 128)
assert im.bands == 2
assert im.format == pyvips.BandFormat.UINT
assert im.width == 128
assert im.height == 128
p = im(45, 35)
assert_almost_equal_objects(p, [45, 35])
def jpeg_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a, [6, 5, 3])
profile = im.get("icc-profile-data")
assert len(profile) == 1352
assert im.width == 1024
assert im.height == 768
assert im.bands == 3
def exr_valid(im):
a = im(10, 10)
assert_almost_equal_objects(a, [0.124512, 0.159668, 0.040375,
255.0],
threshold=0.00001)
assert im.width == 610
assert im.height == 406
assert im.bands == 4
def test_cmyk(self):
test = pyvips.Image.new_from_file(JPEG_FILE)
im = test.colourspace("cmyk").colourspace("srgb")
before = test(582, 210)
after = im(582, 210)
assert_almost_equal_objects(before, after, threshold=10)
def test_cmyk(self):
test = pyvips.Image.new_from_file(JPEG_FILE)
im = test.colourspace("cmyk").colourspace("srgb")
before = test(150, 210)
after = im(150, 210)
assert_almost_equal_objects(before, after, threshold=10)
def jpeg_valid(im):
a = im(10, 10)
# different versions of libjpeg decode have slightly different
# rounding
assert_almost_equal_objects(a, [141, 127, 90], threshold=3)
profile = im.get("icc-profile-data")
assert len(profile) == 564
assert im.width == 290
assert im.height == 442
assert im.bands == 3
def test_crop(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
pixel = test(30, 30)
assert_almost_equal_objects(pixel, [2, 3, 4])
sub = test.crop(25, 25, 10, 10)
pixel = sub(5, 5)
assert_almost_equal_objects(pixel, [2, 3, 4])
def test_subsample(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.subsample(3, 3)
assert im.width == test.width // 3
assert im.height == test.height // 3
before = test(60, 60)
after = im(20, 20)
assert_almost_equal_objects(before, after)
def test_zoom(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.zoom(3, 3)
assert im.width == test.width * 3
assert im.height == test.height * 3
before = test(50, 50)
after = im(150, 150)
assert_almost_equal_objects(before, after)
def test_crop(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
pixel = test(30, 30)
assert_almost_equal_objects(pixel, [2, 3, 4])
sub = test.crop(25, 25, 10, 10)
pixel = sub(5, 5)
assert_almost_equal_objects(pixel, [2, 3, 4])
def test_subsample(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.subsample(3, 3)
assert im.width == test.width // 3
assert im.height == test.height // 3
before = test(60, 60)
after = im(20, 20)
assert_almost_equal_objects(before, after)
def test_zoom(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.zoom(3, 3)
assert im.width == test.width * 3
assert im.height == test.height * 3
before = test(50, 50)
after = im(150, 150)
assert_almost_equal_objects(before, after)
def test_falsecolour(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.falsecolour()
assert im.width == test.width
assert im.height == test.height
assert im.bands == 3
pixel = im(30, 30)
assert_almost_equal_objects(pixel, [20, 0, 41])
def test_gravity(self):
im = pyvips.Image.black(1, 1) + 255
positions = [['centre', 1, 1], ['north', 1, 0], ['south', 1, 2],
['east', 2, 1], ['west', 0, 1], ['north-east', 2, 0],
['south-east', 2, 2], ['south-west', 0, 2],
['north-west', 0, 0]]
for direction, x, y in positions:
im2 = im.gravity(direction, 3, 3)
assert_almost_equal_objects(im2(x, y), [255])
assert_almost_equal_objects(im2.avg(), 255.0 / 9.0)
def test_falsecolour(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.falsecolour()
assert im.width == test.width
assert im.height == test.height
assert im.bands == 3
pixel = im(30, 30)
assert_almost_equal_objects(pixel, [20, 0, 41])
def test_histfind_indexed(self):
im = pyvips.Image.black(50, 100)
test = im.insert(im + 10, 50, 0, expand=True)
index = test // 10
for x in noncomplex_formats:
for y in [pyvips.BandFormat.UCHAR, pyvips.BandFormat.USHORT]:
a = test.cast(x)
b = index.cast(y)
hist = a.hist_find_indexed(b)
assert_almost_equal_objects(hist(0, 0), [0])
assert_almost_equal_objects(hist(1, 0), [50000])
def test_histfind_indexed(self):
im = pyvips.Image.black(50, 100)
test = im.insert(im + 10, 50, 0, expand=True)
index = test // 10
for x in noncomplex_formats:
for y in [pyvips.BandFormat.UCHAR, pyvips.BandFormat.USHORT]:
a = test.cast(x)
b = index.cast(y)
hist = a.hist_find_indexed(b)
assert_almost_equal_objects(hist(0, 0), [0])
assert_almost_equal_objects(hist(1, 0), [50000])
def test_conv(self):
for im in self.all_images:
for msk in self.all_masks:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
convolved = im.conv(msk, precision=prec)
result = convolved(25, 50)
true = conv(im, msk, 24, 49)
assert_almost_equal_objects(result, true)
result = convolved(50, 50)
true = conv(im, msk, 49, 49)
assert_almost_equal_objects(result, true)
def test_conv(self):
for im in self.all_images:
for msk in self.all_masks:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
convolved = im.conv(msk, precision=prec)
result = convolved(25, 50)
true = conv(im, msk, 24, 49)
assert_almost_equal_objects(result, true)
result = convolved(50, 50)
true = conv(im, msk, 49, 49)
assert_almost_equal_objects(result, true)
def test_replicate(self):
for fmt in all_formats:
im = self.colour.cast(fmt)
test = im.replicate(10, 10)
assert test.width == self.colour.width * 10
assert test.height == self.colour.height * 10
before = im(10, 10)
after = test(10 + im.width * 2, 10 + im.width * 2)
assert_almost_equal_objects(before, after)
before = im(50, 50)
after = test(50 + im.width * 2, 50 + im.width * 2)
assert_almost_equal_objects(before, after)
def test_wrap(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.wrap()
assert im.width == test.width
assert im.height == test.height
before = test(0, 0)
after = im(50, 50)
assert_almost_equal_objects(before, after)
before = test(50, 50)
after = im(0, 0)
assert_almost_equal_objects(before, after)
def test_wrap(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
im = test.wrap()
assert im.width == test.width
assert im.height == test.height
before = test(0, 0)
after = im(50, 50)
assert_almost_equal_objects(before, after)
before = test(50, 50)
after = im(0, 0)
assert_almost_equal_objects(before, after)
def test_replicate(self):
for fmt in all_formats:
im = self.colour.cast(fmt)
test = im.replicate(10, 10)
assert test.width == self.colour.width * 10
assert test.height == self.colour.height * 10
before = im(10, 10)
after = test(10 + im.width * 2, 10 + im.width * 2)
assert_almost_equal_objects(before, after)
before = im(50, 50)
after = test(50 + im.width * 2, 50 + im.width * 2)
assert_almost_equal_objects(before, after)
def test_rot(self):
# test has a quarter-circle in the bottom right
test = self.colour.crop(0, 0, 51, 51)
for fmt in all_formats:
im = test.cast(fmt)
im2 = im.rot(pyvips.Angle.D90)
before = im(50, 50)
after = im2(0, 50)
assert_almost_equal_objects(before, after)
for a, b in zip(rot_angles, rot_angle_bonds):
im2 = im.rot(a)
after = im2.rot(b)
diff = (after - im).abs().max()
assert diff == 0
def test_gaussblur(self):
for im in self.all_images:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
for i in range(5, 10):
sigma = i / 5.0
gmask = pyvips.Image.gaussmat(sigma, 0.2, precision=prec)
a = im.conv(gmask, precision=prec)
b = im.gaussblur(sigma, min_ampl=0.2, precision=prec)
a_point = a(25, 50)
b_point = b(25, 50)
assert_almost_equal_objects(a_point,
b_point,
threshold=0.1)
def test_gaussblur(self):
for im in self.all_images:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
for i in range(5, 10):
sigma = i / 5.0
gmask = pyvips.Image.gaussmat(sigma, 0.2,
precision=prec)
a = im.conv(gmask, precision=prec)
b = im.gaussblur(sigma, min_ampl=0.2, precision=prec)
a_point = a(25, 50)
b_point = b(25, 50)
assert_almost_equal_objects(a_point, b_point,
threshold=0.1)
def test_rot(self):
# test has a quarter-circle in the bottom right
test = self.colour.crop(0, 0, 51, 51)
for fmt in all_formats:
im = test.cast(fmt)
im2 = im.rot(pyvips.Angle.D90)
before = im(50, 50)
after = im2(0, 50)
assert_almost_equal_objects(before, after)
for a, b in zip(rot_angles, rot_angle_bonds):
im2 = im.rot(a)
after = im2.rot(b)
diff = (after - im).abs().max()
assert diff == 0
def test_grid(self):
test = self.colour.replicate(1, 12)
assert test.width == self.colour.width
assert test.height == self.colour.height * 12
for fmt in all_formats:
im = test.cast(fmt)
result = im.grid(test.width, 3, 4)
assert result.width == self.colour.width * 3
assert result.height == self.colour.height * 4
before = im(10, 10)
after = result(10 + test.width * 2, 10 + test.width * 2)
assert_almost_equal_objects(before, after)
before = im(50, 50)
after = result(50 + test.width * 2, 50 + test.width * 2)
assert_almost_equal_objects(before, after)
def test_grid(self):
test = self.colour.replicate(1, 12)
assert test.width == self.colour.width
assert test.height == self.colour.height * 12
for fmt in all_formats:
im = test.cast(fmt)
result = im.grid(test.width, 3, 4)
assert result.width == self.colour.width * 3
assert result.height == self.colour.height * 4
before = im(10, 10)
after = result(10 + test.width * 2, 10 + test.width * 2)
assert_almost_equal_objects(before, after)
before = im(50, 50)
after = result(50 + test.width * 2, 50 + test.width * 2)
assert_almost_equal_objects(before, after)
def test_gravity(self):
im = pyvips.Image.black(1, 1) + 255
positions = [
['centre', 1, 1],
['north', 1, 0],
['south', 1, 2],
['east', 2, 1],
['west', 0, 1],
['north-east', 2, 0],
['south-east', 2, 2],
['south-west', 0, 2],
['north-west', 0, 0]
]
for direction, x, y in positions:
im2 = im.gravity(direction, 3, 3)
assert_almost_equal_objects(im2(x, y), [255])
assert_almost_equal_objects(im2.avg(), 255.0 / 9.0)
def test_convsep(self):
for im in self.all_images:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
gmask = pyvips.Image.gaussmat(2, 0.1, precision=prec)
gmask_sep = pyvips.Image.gaussmat(2,
0.1,
separable=True,
precision=prec)
assert gmask.width == gmask.height
assert gmask_sep.width == gmask.width
assert gmask_sep.height == 1
a = im.conv(gmask, precision=prec)
b = im.convsep(gmask_sep, precision=prec)
a_point = a(25, 50)
b_point = b(25, 50)
assert_almost_equal_objects(a_point, b_point, threshold=0.1)
def test_convsep(self):
for im in self.all_images:
for prec in [pyvips.Precision.INTEGER, pyvips.Precision.FLOAT]:
gmask = pyvips.Image.gaussmat(2, 0.1,
precision=prec)
gmask_sep = pyvips.Image.gaussmat(2, 0.1,
separable=True,
precision=prec)
assert gmask.width == gmask.height
assert gmask_sep.width == gmask.width
assert gmask_sep.height == 1
a = im.conv(gmask, precision=prec)
b = im.convsep(gmask_sep, precision=prec)
a_point = a(25, 50)
b_point = b(25, 50)
assert_almost_equal_objects(a_point, b_point, threshold=0.1)
def test_invertlut(self):
lut = pyvips.Image.new_from_array([[0.1, 0.2, 0.3, 0.1],
[0.2, 0.4, 0.4, 0.2],
[0.7, 0.5, 0.6, 0.3]])
im = lut.invertlut()
assert im.width == 256
assert im.height == 1
assert im.bands == 3
assert im.format == pyvips.BandFormat.DOUBLE
p = im(0, 0)
assert_almost_equal_objects(p, [0, 0, 0])
p = im(255, 0)
assert_almost_equal_objects(p, [1, 1, 1])
p = im(0.2 * 255, 0)
assert p[0] == pytest.approx(0.1, abs=0.1)
p = im(0.3 * 255, 0)
assert p[1] == pytest.approx(0.1, abs=0.1)
p = im(0.1 * 255, 0)
assert p[2] == pytest.approx(0.1, abs=0.1)
def test_invertlut(self):
lut = pyvips.Image.new_from_array([[0.1, 0.2, 0.3, 0.1],
[0.2, 0.4, 0.4, 0.2],
[0.7, 0.5, 0.6, 0.3]])
im = lut.invertlut()
assert im.width == 256
assert im.height == 1
assert im.bands == 3
assert im.format == pyvips.BandFormat.DOUBLE
p = im(0, 0)
assert_almost_equal_objects(p, [0, 0, 0])
p = im(255, 0)
assert_almost_equal_objects(p, [1, 1, 1])
p = im(0.2 * 255, 0)
assert pytest.approx(p[0], 0.1) == 0.1
p = im(0.3 * 255, 0)
assert pytest.approx(p[1], 0.1) == 0.1
p = im(0.1 * 255, 0)
assert pytest.approx(p[2], 0.1) == 0.1
def test_insert(self):
for x in all_formats:
for y in all_formats:
main = self.mono.cast(x)
sub = self.colour.cast(y)
r = main.insert(sub, 10, 10)
assert r.width == main.width
assert r.height == main.height
assert r.bands == sub.bands
a = r(10, 10)
b = sub(0, 0)
assert_almost_equal_objects(a, b)
a = r(0, 0)
b = main(0, 0) * 3
assert_almost_equal_objects(a, b)
for x in all_formats:
for y in all_formats:
main = self.mono.cast(x)
sub = self.colour.cast(y)
r = main.insert(sub, 10, 10, expand=True, background=100)
assert r.width == main.width + 10
assert r.height == main.height + 10
assert r.bands == sub.bands
a = r(r.width - 5, 5)
assert_almost_equal_objects(a, [100, 100, 100])
def test_insert(self):
for x in all_formats:
for y in all_formats:
main = self.mono.cast(x)
sub = self.colour.cast(y)
r = main.insert(sub, 10, 10)
assert r.width == main.width
assert r.height == main.height
assert r.bands == sub.bands
a = r(10, 10)
b = sub(0, 0)
assert_almost_equal_objects(a, b)
a = r(0, 0)
b = main(0, 0) * 3
assert_almost_equal_objects(a, b)
for x in all_formats:
for y in all_formats:
main = self.mono.cast(x)
sub = self.colour.cast(y)
r = main.insert(sub, 10, 10, expand=True, background=100)
assert r.width == main.width + 10
assert r.height == main.height + 10
assert r.bands == sub.bands
a = r(r.width - 5, 5)
assert_almost_equal_objects(a, [100, 100, 100])
def test_black(self):
im = pyvips.Image.black(100, 100)
assert im.width == 100
assert im.height == 100
assert im.format == pyvips.BandFormat.UCHAR
assert im.bands == 1
for i in range(0, 100):
pixel = im(i, i)
assert len(pixel) == 1
assert pixel[0] == 0
im = pyvips.Image.black(100, 100, bands=3)
assert im.width == 100
assert im.height == 100
assert im.format == pyvips.BandFormat.UCHAR
assert im.bands == 3
for i in range(0, 100):
pixel = im(i, i)
assert len(pixel) == 3
assert_almost_equal_objects(pixel, [0, 0, 0])
def test_black(self):
im = pyvips.Image.black(100, 100)
assert im.width == 100
assert im.height == 100
assert im.format == pyvips.BandFormat.UCHAR
assert im.bands == 1
for i in range(0, 100):
pixel = im(i, i)
assert len(pixel) == 1
assert pixel[0] == 0
im = pyvips.Image.black(100, 100, bands=3)
assert im.width == 100
assert im.height == 100
assert im.format == pyvips.BandFormat.UCHAR
assert im.bands == 3
for i in range(0, 100):
pixel = im(i, i)
assert len(pixel) == 3
assert_almost_equal_objects(pixel, [0, 0, 0])
def test_buildlut(self):
M = pyvips.Image.new_from_array([[0, 0], [255, 100]])
lut = M.buildlut()
assert lut.width == 256
assert lut.height == 1
assert lut.bands == 1
p = lut(0, 0)
assert p[0] == 0.0
p = lut(255, 0)
assert p[0] == 100.0
p = lut(10, 0)
assert p[0] == 100 * 10.0 / 255.0
M = pyvips.Image.new_from_array([[0, 0, 100], [255, 100, 0],
[128, 10, 90]])
lut = M.buildlut()
assert lut.width == 256
assert lut.height == 1
assert lut.bands == 2
p = lut(0, 0)
assert_almost_equal_objects(p, [0.0, 100.0])
p = lut(64, 0)
assert_almost_equal_objects(p, [5.0, 95.0])
def test_project(self):
im = pyvips.Image.black(50, 50)
test = im.insert(im + 10, 50, 0, expand=True)
for fmt in noncomplex_formats:
columns, rows = test.cast(fmt).project()
assert_almost_equal_objects(columns(10, 0), [0])
assert_almost_equal_objects(columns(70, 0), [50 * 10])
assert_almost_equal_objects(rows(0, 10), [50 * 10])
def test_project(self):
im = pyvips.Image.black(50, 50)
test = im.insert(im + 10, 50, 0, expand=True)
for fmt in noncomplex_formats:
columns, rows = test.cast(fmt).project()
assert_almost_equal_objects(columns(10, 0), [0])
assert_almost_equal_objects(columns(70, 0), [50 * 10])
assert_almost_equal_objects(rows(0, 10), [50 * 10])
def test_histfind_ndim(self):
im = pyvips.Image.black(100, 100) + [1, 2, 3]
for fmt in noncomplex_formats:
hist = im.cast(fmt).hist_find_ndim()
assert_almost_equal_objects(hist(0, 0)[0], 10000)
assert_almost_equal_objects(hist(5, 5)[5], 0)
hist = im.cast(fmt).hist_find_ndim(bins=1)
assert_almost_equal_objects(hist(0, 0)[0], 10000)
assert hist.width == 1
assert hist.height == 1
assert hist.bands == 1
def test_histfind_ndim(self):
im = pyvips.Image.black(100, 100) + [1, 2, 3]
for fmt in noncomplex_formats:
hist = im.cast(fmt).hist_find_ndim()
assert_almost_equal_objects(hist(0, 0)[0], 10000)
assert_almost_equal_objects(hist(5, 5)[5], 0)
hist = im.cast(fmt).hist_find_ndim(bins=1)
assert_almost_equal_objects(hist(0, 0)[0], 10000)
assert hist.width == 1
assert hist.height == 1
assert hist.bands == 1
def test_extract(self):
for fmt in all_formats:
test = self.colour.cast(fmt)
pixel = test(30, 30)
assert_almost_equal_objects(pixel, [2, 3, 4])
sub = test.extract_area(25, 25, 10, 10)
pixel = sub(5, 5)
assert_almost_equal_objects(pixel, [2, 3, 4])
sub = test.extract_band(1, n=2)
pixel = sub(30, 30)
assert_almost_equal_objects(pixel, [3, 4])
def test_msb(self):
for fmt in unsigned_formats:
mx = max_value[fmt]
size = sizeof_format[fmt]
test = (self.colour + mx / 8.0).cast(fmt)
im = test.msb()
before = test(10, 10)
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im(10, 10)
assert_almost_equal_objects(result, predict)
before = test(50, 50)
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im(50, 50)
assert_almost_equal_objects(result, predict)
for fmt in signed_formats:
mx = max_value[fmt]
size = sizeof_format[fmt]
test = (self.colour + mx / 8.0).cast(fmt)
im = test.msb()
before = test(10, 10)
predict = [128 + (int(x) >> ((size - 1) * 8)) for x in before]
result = im(10, 10)
assert_almost_equal_objects(result, predict)
before = test(50, 50)
predict = [128 + (int(x) >> ((size - 1) * 8)) for x in before]
result = im(50, 50)
assert_almost_equal_objects(result, predict)
for fmt in unsigned_formats:
mx = max_value[fmt]
size = sizeof_format[fmt]
test = (self.colour + mx / 8.0).cast(fmt)
im = test.msb(band=1)
before = [test(10, 10)[1]]
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im(10, 10)
assert_almost_equal_objects(result, predict)
before = [test(50, 50)[1]]
predict = [int(x) >> ((size - 1) * 8) for x in before]
result = im(50, 50)
assert_almost_equal_objects(result, predict)
def test_colourspace(self):
# mid-grey in Lab ... put 42 in the extra band, it should be copied
# unmodified
test = pyvips.Image.black(100, 100) + [50, 0, 0, 42]
test = test.copy(interpretation=pyvips.Interpretation.LAB)
# a long series should come in a circle
im = test
for col in colour_colourspaces + [pyvips.Interpretation.LAB]:
im = im.colourspace(col)
assert im.interpretation == col
for i in range(0, 4):
min_l = im.extract_band(i).min()
max_h = im.extract_band(i).max()
assert pytest.approx(min_l) == max_h
pixel = im(10, 10)
assert pytest.approx(pixel[3], 0.01) == 42
# alpha won't be equal for RGB16, but it should be preserved if we go
# there and back
im = im.colourspace(pyvips.Interpretation.RGB16)
im = im.colourspace(pyvips.Interpretation.LAB)
before = test(10, 10)
after = im(10, 10)
assert_almost_equal_objects(before, after, threshold=0.1)
# go between every pair of colour spaces
for start in colour_colourspaces:
for end in colour_colourspaces:
im = test.colourspace(start)
im2 = im.colourspace(end)
im3 = im2.colourspace(pyvips.Interpretation.LAB)
before = test(10, 10)
after = im3(10, 10)
assert_almost_equal_objects(before, after, threshold=0.1)
# test Lab->XYZ on mid-grey
# checked against http://www.brucelindbloom.com
im = test.colourspace(pyvips.Interpretation.XYZ)
after = im(10, 10)
assert_almost_equal_objects(after, [17.5064, 18.4187, 20.0547, 42])
# grey->colour->grey should be equal
for mono_fmt in mono_colourspaces:
test_grey = test.colourspace(mono_fmt)
im = test_grey
for col in colour_colourspaces + [mono_fmt]:
im = im.colourspace(col)
assert im.interpretation == col
[before, alpha_before] = test_grey(10, 10)
[after, alpha_after] = im(10, 10)
assert abs(alpha_after - alpha_before) < 1
if mono_fmt == pyvips.Interpretation.GREY16:
# GREY16 can wind up rather different due to rounding
assert abs(after - before) < 30
else:
# but 8-bit we should hit exactly
assert abs(after - before) < 1
