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Pillow/Tests/test_imagecms.py
Jon Dufresne 4de5477b61 Remove unnecessary unittest.main() boilerplate from test files 
With the introduction and use of pytest, it is simple and easy to
execute specific tests in isolation through documented command line
arguments. Either by specifying the module path or through the `-k
EXPRESSION` argument. There is no longer any need to provide the
boilerplate:

    if __name__ == '__main__':
        unittest.main()

To every test file. It is simply noise.

The pattern remains in test files that aren't named with `test_*` as
those files are not discovered and executed by pytest by default.
2019-02-03 10:10:16 -08:00

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from .helper import PillowTestCase, hopper
import datetime
from PIL import Image, ImageMode
from io import BytesIO
import os
try:
from PIL import ImageCms
from PIL.ImageCms import ImageCmsProfile
ImageCms.core.profile_open
except ImportError:
# Skipped via setUp()
pass
SRGB = "Tests/icc/sRGB_IEC61966-2-1_black_scaled.icc"
HAVE_PROFILE = os.path.exists(SRGB)
class TestImageCms(PillowTestCase):
def setUp(self):
try:
from PIL import ImageCms
# need to hit getattr to trigger the delayed import error
ImageCms.core.profile_open
except ImportError as v:
self.skipTest(v)
def skip_missing(self):
if not HAVE_PROFILE:
self.skipTest("SRGB profile not available")
def test_sanity(self):
# basic smoke test.
# this mostly follows the cms_test outline.
v = ImageCms.versions() # should return four strings
self.assertEqual(v[0], '1.0.0 pil')
self.assertEqual(list(map(type, v)), [str, str, str, str])
# internal version number
self.assertRegex(ImageCms.core.littlecms_version, r"\d+\.\d+$")
self.skip_missing()
i = ImageCms.profileToProfile(hopper(), SRGB, SRGB)
self.assert_image(i, "RGB", (128, 128))
i = hopper()
ImageCms.profileToProfile(i, SRGB, SRGB, inPlace=True)
self.assert_image(i, "RGB", (128, 128))
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
i = hopper()
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
ImageCms.applyTransform(hopper(), t, inPlace=True)
self.assert_image(i, "RGB", (128, 128))
p = ImageCms.createProfile("sRGB")
o = ImageCms.getOpenProfile(SRGB)
t = ImageCms.buildTransformFromOpenProfiles(p, o, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
t = ImageCms.buildProofTransform(SRGB, SRGB, SRGB, "RGB", "RGB")
self.assertEqual(t.inputMode, "RGB")
self.assertEqual(t.outputMode, "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
# test PointTransform convenience API
hopper().point(t)
def test_name(self):
self.skip_missing()
# get profile information for file
self.assertEqual(
ImageCms.getProfileName(SRGB).strip(),
'IEC 61966-2-1 Default RGB Colour Space - sRGB')
def test_info(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileInfo(SRGB).splitlines(), [
'sRGB IEC61966-2-1 black scaled', '',
'Copyright International Color Consortium, 2009', ''])
def test_copyright(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileCopyright(SRGB).strip(),
'Copyright International Color Consortium, 2009')
def test_manufacturer(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileManufacturer(SRGB).strip(),
'')
def test_model(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileModel(SRGB).strip(),
'IEC 61966-2-1 Default RGB Colour Space - sRGB')
def test_description(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileDescription(SRGB).strip(),
'sRGB IEC61966-2-1 black scaled')
def test_intent(self):
self.skip_missing()
self.assertEqual(ImageCms.getDefaultIntent(SRGB), 0)
self.assertEqual(ImageCms.isIntentSupported(
SRGB, ImageCms.INTENT_ABSOLUTE_COLORIMETRIC,
ImageCms.DIRECTION_INPUT), 1)
def test_profile_object(self):
# same, using profile object
p = ImageCms.createProfile("sRGB")
# self.assertEqual(ImageCms.getProfileName(p).strip(),
# 'sRGB built-in - (lcms internal)')
# self.assertEqual(ImageCms.getProfileInfo(p).splitlines(),
# ['sRGB built-in', '', 'WhitePoint : D65 (daylight)', '', ''])
self.assertEqual(ImageCms.getDefaultIntent(p), 0)
self.assertEqual(ImageCms.isIntentSupported(
p, ImageCms.INTENT_ABSOLUTE_COLORIMETRIC,
ImageCms.DIRECTION_INPUT), 1)
def test_extensions(self):
# extensions
i = Image.open("Tests/images/rgb.jpg")
p = ImageCms.getOpenProfile(BytesIO(i.info["icc_profile"]))
self.assertEqual(
ImageCms.getProfileName(p).strip(),
'IEC 61966-2.1 Default RGB colour space - sRGB')
def test_exceptions(self):
# Test mode mismatch
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
self.assertRaises(ValueError, t.apply_in_place, hopper("RGBA"))
# the procedural pyCMS API uses PyCMSError for all sorts of errors
self.assertRaises(
ImageCms.PyCMSError,
ImageCms.profileToProfile, hopper(), "foo", "bar")
self.assertRaises(
ImageCms.PyCMSError,
ImageCms.buildTransform, "foo", "bar", "RGB", "RGB")
self.assertRaises(
ImageCms.PyCMSError,
ImageCms.getProfileName, None)
self.skip_missing()
self.assertRaises(
ImageCms.PyCMSError,
ImageCms.isIntentSupported, SRGB, None, None)
def test_display_profile(self):
# try fetching the profile for the current display device
ImageCms.get_display_profile()
def test_lab_color_profile(self):
ImageCms.createProfile("LAB", 5000)
ImageCms.createProfile("LAB", 6500)
def test_unsupported_color_space(self):
self.assertRaises(ImageCms.PyCMSError,
ImageCms.createProfile, "unsupported")
def test_invalid_color_temperature(self):
self.assertRaises(ImageCms.PyCMSError,
ImageCms.createProfile, "LAB", "invalid")
def test_simple_lab(self):
i = Image.new('RGB', (10, 10), (128, 128, 128))
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
i_lab = ImageCms.applyTransform(i, t)
self.assertEqual(i_lab.mode, 'LAB')
k = i_lab.getpixel((0, 0))
# not a linear luminance map. so L != 128:
self.assertEqual(k, (137, 128, 128))
l_data = i_lab.getdata(0)
a_data = i_lab.getdata(1)
b_data = i_lab.getdata(2)
self.assertEqual(list(l_data), [137] * 100)
self.assertEqual(list(a_data), [128] * 100)
self.assertEqual(list(b_data), [128] * 100)
def test_lab_color(self):
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
# Need to add a type mapping for some PIL type to TYPE_Lab_8 in
# findLCMSType, and have that mapping work back to a PIL mode
# (likely RGB).
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "LAB", (128, 128))
# i.save('temp.lab.tif') # visually verified vs PS.
target = Image.open('Tests/images/hopper.Lab.tif')
self.assert_image_similar(i, target, 3.5)
def test_lab_srgb(self):
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
img = Image.open('Tests/images/hopper.Lab.tif')
img_srgb = ImageCms.applyTransform(img, t)
# img_srgb.save('temp.srgb.tif') # visually verified vs ps.
self.assert_image_similar(hopper(), img_srgb, 30)
self.assertTrue(img_srgb.info['icc_profile'])
profile = ImageCmsProfile(BytesIO(img_srgb.info['icc_profile']))
self.assertIn('sRGB', ImageCms.getProfileDescription(profile))
def test_lab_roundtrip(self):
# check to see if we're at least internally consistent.
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
t2 = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assertEqual(i.info['icc_profile'],
ImageCmsProfile(pLab).tobytes())
out = ImageCms.applyTransform(i, t2)
self.assert_image_similar(hopper(), out, 2)
def test_profile_tobytes(self):
i = Image.open("Tests/images/rgb.jpg")
p = ImageCms.getOpenProfile(BytesIO(i.info["icc_profile"]))
p2 = ImageCms.getOpenProfile(BytesIO(p.tobytes()))
# not the same bytes as the original icc_profile,
# but it does roundtrip
self.assertEqual(p.tobytes(), p2.tobytes())
self.assertEqual(ImageCms.getProfileName(p),
ImageCms.getProfileName(p2))
self.assertEqual(ImageCms.getProfileDescription(p),
ImageCms.getProfileDescription(p2))
def test_extended_information(self):
self.skip_missing()
o = ImageCms.getOpenProfile(SRGB)
p = o.profile
def assert_truncated_tuple_equal(tup1, tup2, digits=10):
# Helper function to reduce precision of tuples of floats
# recursively and then check equality.
power = 10 ** digits
def truncate_tuple(tuple_or_float):
return tuple(
truncate_tuple(val) if isinstance(val, tuple)
else int(val * power) / power for val in tuple_or_float)
self.assertEqual(truncate_tuple(tup1), truncate_tuple(tup2))
self.assertEqual(p.attributes, 4294967296)
assert_truncated_tuple_equal(
p.blue_colorant,
((0.14306640625, 0.06060791015625, 0.7140960693359375),
(0.1558847490315394, 0.06603820639433387, 0.06060791015625)))
assert_truncated_tuple_equal(
p.blue_primary,
((0.14306641366715667, 0.06060790921083026, 0.7140960805782015),
(0.15588475410450106, 0.06603820408959558, 0.06060790921083026)))
assert_truncated_tuple_equal(
p.chromatic_adaptation,
(((1.04791259765625, 0.0229339599609375, -0.050201416015625),
(0.02960205078125, 0.9904632568359375, -0.0170745849609375),
(-0.009246826171875, 0.0150604248046875, 0.7517852783203125)),
((1.0267159024652783, 0.022470062342089134, 0.0229339599609375),
(0.02951378324103937, 0.9875098886387147, 0.9904632568359375),
(-0.012205438066465256, 0.01987915407854985, 0.0150604248046875))))
self.assertIsNone(p.chromaticity)
self.assertEqual(p.clut, {
0: (False, False, True),
1: (False, False, True),
2: (False, False, True),
3: (False, False, True)
})
self.assertEqual(p.color_space, 'RGB')
self.assertIsNone(p.colorant_table)
self.assertIsNone(p.colorant_table_out)
self.assertIsNone(p.colorimetric_intent)
self.assertEqual(p.connection_space, 'XYZ ')
self.assertEqual(p.copyright,
'Copyright International Color Consortium, 2009')
self.assertEqual(p.creation_date,
datetime.datetime(2009, 2, 27, 21, 36, 31))
self.assertEqual(p.device_class, 'mntr')
assert_truncated_tuple_equal(
p.green_colorant,
((0.3851470947265625, 0.7168731689453125, 0.097076416015625),
(0.32119769927720654, 0.5978443449048152, 0.7168731689453125)))
assert_truncated_tuple_equal(
p.green_primary,
((0.3851470888162112, 0.7168731974161346, 0.09707641738998518),
(0.32119768793686687, 0.5978443567149709, 0.7168731974161346)))
self.assertEqual(p.header_flags, 0)
self.assertEqual(p.header_manufacturer, '\x00\x00\x00\x00')
self.assertEqual(p.header_model, '\x00\x00\x00\x00')
self.assertEqual(p.icc_measurement_condition, {
'backing': (0.0, 0.0, 0.0),
'flare': 0.0,
'geo': 'unknown',
'observer': 1,
'illuminant_type': 'D65'
})
self.assertEqual(p.icc_version, 33554432)
self.assertIsNone(p.icc_viewing_condition)
self.assertEqual(p.intent_supported, {
0: (True, True, True),
1: (True, True, True),
2: (True, True, True),
3: (True, True, True)
})
self.assertTrue(p.is_matrix_shaper)
self.assertEqual(p.luminance, ((0.0, 80.0, 0.0), (0.0, 1.0, 80.0)))
self.assertIsNone(p.manufacturer)
assert_truncated_tuple_equal(
p.media_black_point,
((0.012054443359375, 0.0124969482421875, 0.01031494140625),
(0.34573304157549234, 0.35842450765864337, 0.0124969482421875)))
assert_truncated_tuple_equal(
p.media_white_point,
((0.964202880859375, 1.0, 0.8249053955078125),
(0.3457029219802284, 0.3585375327567059, 1.0)))
assert_truncated_tuple_equal(
(p.media_white_point_temperature,),
(5000.722328847392,))
self.assertEqual(p.model,
'IEC 61966-2-1 Default RGB Colour Space - sRGB')
self.assertEqual(p.pcs, 'XYZ')
self.assertIsNone(p.perceptual_rendering_intent_gamut)
self.assertEqual(p.product_copyright,
'Copyright International Color Consortium, 2009')
self.assertEqual(p.product_desc, 'sRGB IEC61966-2-1 black scaled')
self.assertEqual(p.product_description,
'sRGB IEC61966-2-1 black scaled')
self.assertEqual(p.product_manufacturer, '')
self.assertEqual(
p.product_model, 'IEC 61966-2-1 Default RGB Colour Space - sRGB')
self.assertEqual(
p.profile_description, 'sRGB IEC61966-2-1 black scaled')
self.assertEqual(
p.profile_id, b')\xf8=\xde\xaf\xf2U\xaexB\xfa\xe4\xca\x839\r')
assert_truncated_tuple_equal(
p.red_colorant,
((0.436065673828125, 0.2224884033203125, 0.013916015625),
(0.6484536316398539, 0.3308524880306778, 0.2224884033203125)))
assert_truncated_tuple_equal(
p.red_primary,
((0.43606566581047446, 0.22248840582960838, 0.013916015621759925),
(0.6484536250319214, 0.3308524944738204, 0.22248840582960838)))
self.assertEqual(p.rendering_intent, 0)
self.assertIsNone(p.saturation_rendering_intent_gamut)
self.assertIsNone(p.screening_description)
self.assertIsNone(p.target)
self.assertEqual(p.technology, 'CRT ')
self.assertEqual(p.version, 2.0)
self.assertEqual(p.viewing_condition,
'Reference Viewing Condition in IEC 61966-2-1')
self.assertEqual(p.xcolor_space, 'RGB ')
def test_profile_typesafety(self):
""" Profile init type safety
prepatch, these would segfault, postpatch they should emit a typeerror
"""
with self.assertRaises(TypeError):
ImageCms.ImageCmsProfile(0).tobytes()
with self.assertRaises(TypeError):
ImageCms.ImageCmsProfile(1).tobytes()
def assert_aux_channel_preserved(self, mode,
transform_in_place, preserved_channel):
def create_test_image():
# set up test image with something interesting in the tested aux
# channel.
nine_grid_deltas = [ # noqa: E128
(-1, -1), (-1, 0), (-1, 1),
(0, -1), (0, 0), (0, 1),
(1, -1), (1, 0), (1, 1),
]
chans = []
bands = ImageMode.getmode(mode).bands
for band_ndx in range(len(bands)):
channel_type = 'L' # 8-bit unorm
channel_pattern = hopper(channel_type)
# paste pattern with varying offsets to avoid correlation
# potentially hiding some bugs (like channels getting mixed).
paste_offset = (
int(band_ndx / float(len(bands)) * channel_pattern.size[0]),
int(band_ndx / float(len(bands) * 2) * channel_pattern.size[1])
)
channel_data = Image.new(channel_type, channel_pattern.size)
for delta in nine_grid_deltas:
channel_data.paste(
channel_pattern,
tuple(paste_offset[c] + delta[c] * channel_pattern.size[c]
for c in range(2)),
)
chans.append(channel_data)
return Image.merge(mode, chans)
source_image = create_test_image()
source_image_aux = source_image.getchannel(preserved_channel)
# create some transform, it doesn't matter which one
source_profile = ImageCms.createProfile("sRGB")
destination_profile = ImageCms.createProfile("sRGB")
t = ImageCms.buildTransform(
source_profile, destination_profile, inMode=mode, outMode=mode)
# apply transform
if transform_in_place:
ImageCms.applyTransform(source_image, t, inPlace=True)
result_image = source_image
else:
result_image = ImageCms.applyTransform(
source_image, t, inPlace=False)
result_image_aux = result_image.getchannel(preserved_channel)
self.assert_image_equal(source_image_aux, result_image_aux)
def test_preserve_auxiliary_channels_rgba(self):
self.assert_aux_channel_preserved(
mode='RGBA', transform_in_place=False, preserved_channel='A')
def test_preserve_auxiliary_channels_rgba_in_place(self):
self.assert_aux_channel_preserved(
mode='RGBA', transform_in_place=True, preserved_channel='A')
def test_preserve_auxiliary_channels_rgbx(self):
self.assert_aux_channel_preserved(
mode='RGBX', transform_in_place=False, preserved_channel='X')
def test_preserve_auxiliary_channels_rgbx_in_place(self):
self.assert_aux_channel_preserved(
mode='RGBX', transform_in_place=True, preserved_channel='X')
def test_auxiliary_channels_isolated(self):
# test data in aux channels does not affect non-aux channels
aux_channel_formats = [
# format, profile, color-only format, source test image
('RGBA', 'sRGB', 'RGB', hopper('RGBA')),
('RGBX', 'sRGB', 'RGB', hopper('RGBX')),
('LAB', 'LAB', 'LAB', Image.open('Tests/images/hopper.Lab.tif')),
]
for src_format in aux_channel_formats:
for dst_format in aux_channel_formats:
for transform_in_place in [True, False]:
# inplace only if format doesn't change
if transform_in_place and src_format[0] != dst_format[0]:
continue
# convert with and without AUX data, test colors are equal
source_profile = ImageCms.createProfile(src_format[1])
destination_profile = ImageCms.createProfile(dst_format[1])
source_image = src_format[3]
test_transform = ImageCms.buildTransform(
source_profile, destination_profile,
inMode=src_format[0], outMode=dst_format[0])
# test conversion from aux-ful source
if transform_in_place:
test_image = source_image.copy()
ImageCms.applyTransform(
test_image, test_transform, inPlace=True)
else:
test_image = ImageCms.applyTransform(
source_image, test_transform, inPlace=False)
# reference conversion from aux-less source
reference_transform = ImageCms.buildTransform(
source_profile, destination_profile,
inMode=src_format[2], outMode=dst_format[2])
reference_image = ImageCms.applyTransform(
source_image.convert(src_format[2]),
reference_transform)
self.assert_image_equal(test_image.convert(dst_format[2]),
reference_image)
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