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Pillow/Tests/test_imagecms.py

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import datetime
import os
from io import BytesIO
import pytest
from PIL import Image, ImageMode
from .helper import (
PillowTestCase,
assert_image,
assert_image_equal,
assert_image_similar,
hopper,
)
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)
assert_image(i, "RGB", (128, 128))
i = hopper()
ImageCms.profileToProfile(i, SRGB, SRGB, inPlace=True)
assert_image(i, "RGB", (128, 128))
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
assert_image(i, "RGB", (128, 128))
with hopper() as i:
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
ImageCms.applyTransform(hopper(), t, inPlace=True)
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)
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)
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
with Image.open("Tests/images/rgb.jpg") as i:
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
with hopper() as im:
self.assertRaises(
ImageCms.PyCMSError, ImageCms.profileToProfile, im, "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)
assert_image(i, "LAB", (128, 128))
# i.save('temp.lab.tif') # visually verified vs PS.
with Image.open("Tests/images/hopper.Lab.tif") as target:
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")
with Image.open("Tests/images/hopper.Lab.tif") as img:
img_srgb = ImageCms.applyTransform(img, t)
# img_srgb.save('temp.srgb.tif') # visually verified vs ps.
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)
assert_image_similar(hopper(), out, 2)
def test_profile_tobytes(self):
with Image.open("Tests/images/rgb.jpg") as i:
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.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.assertIsNone(p.perceptual_rendering_intent_gamut)
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_deprecations(self):
self.skip_missing()
o = ImageCms.getOpenProfile(SRGB)
p = o.profile
def helper_deprecated(attr, expected):
result = pytest.warns(DeprecationWarning, getattr, p, attr)
self.assertEqual(result, expected)
# p.color_space
helper_deprecated("color_space", "RGB")
# p.pcs
helper_deprecated("pcs", "XYZ")
# p.product_copyright
helper_deprecated(
"product_copyright", "Copyright International Color Consortium, 2009"
)
# p.product_desc
helper_deprecated("product_desc", "sRGB IEC61966-2-1 black scaled")
# p.product_description
helper_deprecated("product_description", "sRGB IEC61966-2-1 black scaled")
# p.product_manufacturer
helper_deprecated("product_manufacturer", "")
# p.product_model
helper_deprecated(
"product_model", "IEC 61966-2-1 Default RGB Colour Space - sRGB"
)
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.
# fmt: off
nine_grid_deltas = [ # noqa: E131
(-1, -1), (-1, 0), (-1, 1),
(0, -1), (0, 0), (0, 1),
(1, -1), (1, 0), (1, 1),
]
# fmt: on
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 / len(bands) * channel_pattern.size[0]),
int(band_ndx / (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)
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
)
assert_image_equal(
test_image.convert(dst_format[2]), reference_image
)
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