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test_imagecms.py
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test_imagecms.py
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import datetime
import os
import re
import shutil
from io import BytesIO
import pytest
from PIL import Image, ImageMode, features
from .helper import 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_module()
pass
SRGB = "Tests/icc/sRGB_IEC61966-2-1_black_scaled.icc"
HAVE_PROFILE = os.path.exists(SRGB)
def setup_module():
try:
from PIL import ImageCms
# need to hit getattr to trigger the delayed import error
ImageCms.core.profile_open
except ImportError as v:
pytest.skip(str(v))
def skip_missing():
if not HAVE_PROFILE:
pytest.skip("SRGB profile not available")
def test_sanity():
# basic smoke test.
# this mostly follows the cms_test outline.
v = ImageCms.versions() # should return four strings
assert v[0] == "1.0.0 pil"
assert list(map(type, v)) == [str, str, str, str]
# internal version number
assert re.search(r"\d+\.\d+$", features.version_module("littlecms2"))
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")
assert t.inputMode == "RGB"
assert t.outputMode == "RGB"
i = ImageCms.applyTransform(hopper(), t)
assert_image(i, "RGB", (128, 128))
# test PointTransform convenience API
hopper().point(t)
def test_name():
skip_missing()
# get profile information for file
assert (
ImageCms.getProfileName(SRGB).strip()
== "IEC 61966-2-1 Default RGB Colour Space - sRGB"
)
def test_info():
skip_missing()
assert ImageCms.getProfileInfo(SRGB).splitlines() == [
"sRGB IEC61966-2-1 black scaled",
"",
"Copyright International Color Consortium, 2009",
"",
]
def test_copyright():
skip_missing()
assert (
ImageCms.getProfileCopyright(SRGB).strip()
== "Copyright International Color Consortium, 2009"
)
def test_manufacturer():
skip_missing()
assert ImageCms.getProfileManufacturer(SRGB).strip() == ""
def test_model():
skip_missing()
assert (
ImageCms.getProfileModel(SRGB).strip()
== "IEC 61966-2-1 Default RGB Colour Space - sRGB"
)
def test_description():
skip_missing()
assert (
ImageCms.getProfileDescription(SRGB).strip() == "sRGB IEC61966-2-1 black scaled"
)
def test_intent():
skip_missing()
assert ImageCms.getDefaultIntent(SRGB) == 0
support = ImageCms.isIntentSupported(
SRGB, ImageCms.INTENT_ABSOLUTE_COLORIMETRIC, ImageCms.DIRECTION_INPUT
)
assert support == 1
def test_profile_object():
# same, using profile object
p = ImageCms.createProfile("sRGB")
# assert ImageCms.getProfileName(p).strip() == "sRGB built-in - (lcms internal)"
# assert ImageCms.getProfileInfo(p).splitlines() ==
# ["sRGB built-in", "", "WhitePoint : D65 (daylight)", "", ""]
assert ImageCms.getDefaultIntent(p) == 0
support = ImageCms.isIntentSupported(
p, ImageCms.INTENT_ABSOLUTE_COLORIMETRIC, ImageCms.DIRECTION_INPUT
)
assert support == 1
def test_extensions():
# extensions
with Image.open("Tests/images/rgb.jpg") as i:
p = ImageCms.getOpenProfile(BytesIO(i.info["icc_profile"]))
assert (
ImageCms.getProfileName(p).strip()
== "IEC 61966-2.1 Default RGB colour space - sRGB"
)
def test_exceptions():
# Test mode mismatch
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
with pytest.raises(ValueError):
t.apply_in_place(hopper("RGBA"))
# the procedural pyCMS API uses PyCMSError for all sorts of errors
with hopper() as im:
with pytest.raises(ImageCms.PyCMSError):
ImageCms.profileToProfile(im, "foo", "bar")
with pytest.raises(ImageCms.PyCMSError):
ImageCms.buildTransform("foo", "bar", "RGB", "RGB")
with pytest.raises(ImageCms.PyCMSError):
ImageCms.getProfileName(None)
skip_missing()
with pytest.raises(ImageCms.PyCMSError):
ImageCms.isIntentSupported(SRGB, None, None)
def test_display_profile():
# try fetching the profile for the current display device
ImageCms.get_display_profile()
def test_lab_color_profile():
ImageCms.createProfile("LAB", 5000)
ImageCms.createProfile("LAB", 6500)
def test_unsupported_color_space():
with pytest.raises(ImageCms.PyCMSError):
ImageCms.createProfile("unsupported")
def test_invalid_color_temperature():
with pytest.raises(ImageCms.PyCMSError):
ImageCms.createProfile("LAB", "invalid")
def test_simple_lab():
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)
assert i_lab.mode == "LAB"
k = i_lab.getpixel((0, 0))
# not a linear luminance map. so L != 128:
assert k == (137, 128, 128)
l_data = i_lab.getdata(0)
a_data = i_lab.getdata(1)
b_data = i_lab.getdata(2)
assert list(l_data) == [137] * 100
assert list(a_data) == [128] * 100
assert list(b_data) == [128] * 100
def test_lab_color():
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():
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)
assert img_srgb.info["icc_profile"]
profile = ImageCmsProfile(BytesIO(img_srgb.info["icc_profile"]))
assert "sRGB" in ImageCms.getProfileDescription(profile)
def test_lab_roundtrip():
# 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)
assert i.info["icc_profile"] == ImageCmsProfile(pLab).tobytes()
out = ImageCms.applyTransform(i, t2)
assert_image_similar(hopper(), out, 2)
def test_profile_tobytes():
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
assert p.tobytes() == p2.tobytes()
assert ImageCms.getProfileName(p) == ImageCms.getProfileName(p2)
assert ImageCms.getProfileDescription(p) == ImageCms.getProfileDescription(p2)
def test_extended_information():
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
)
assert truncate_tuple(tup1) == truncate_tuple(tup2)
assert 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),
),
),
)
assert p.chromaticity is None
assert p.clut == {
0: (False, False, True),
1: (False, False, True),
2: (False, False, True),
3: (False, False, True),
}
assert p.colorant_table is None
assert p.colorant_table_out is None
assert p.colorimetric_intent is None
assert p.connection_space == "XYZ "
assert p.copyright == "Copyright International Color Consortium, 2009"
assert p.creation_date == datetime.datetime(2009, 2, 27, 21, 36, 31)
assert 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),
),
)
assert p.header_flags == 0
assert p.header_manufacturer == "\x00\x00\x00\x00"
assert p.header_model == "\x00\x00\x00\x00"
assert p.icc_measurement_condition == {
"backing": (0.0, 0.0, 0.0),
"flare": 0.0,
"geo": "unknown",
"observer": 1,
"illuminant_type": "D65",
}
assert p.icc_version == 33554432
assert p.icc_viewing_condition is None
assert p.intent_supported == {
0: (True, True, True),
1: (True, True, True),
2: (True, True, True),
3: (True, True, True),
}
assert p.is_matrix_shaper
assert p.luminance == ((0.0, 80.0, 0.0), (0.0, 1.0, 80.0))
assert p.manufacturer is None
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,)
)
assert p.model == "IEC 61966-2-1 Default RGB Colour Space - sRGB"
assert p.perceptual_rendering_intent_gamut is None
assert p.profile_description == "sRGB IEC61966-2-1 black scaled"
assert 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),
),
)
assert p.rendering_intent == 0
assert p.saturation_rendering_intent_gamut is None
assert p.screening_description is None
assert p.target is None
assert p.technology == "CRT "
assert p.version == 2.0
assert p.viewing_condition == "Reference Viewing Condition in IEC 61966-2-1"
assert p.xcolor_space == "RGB "
def test_non_ascii_path(tmp_path):
skip_missing()
tempfile = str(tmp_path / ("temp_" + chr(128) + ".icc"))
try:
shutil.copy(SRGB, tempfile)
except UnicodeEncodeError:
pytest.skip("Non-ASCII path could not be created")
o = ImageCms.getOpenProfile(tempfile)
p = o.profile
assert p.model == "IEC 61966-2-1 Default RGB Colour Space - sRGB"
def test_profile_typesafety():
"""Profile init type safety
prepatch, these would segfault, postpatch they should emit a typeerror
"""
with pytest.raises(TypeError):
ImageCms.ImageCmsProfile(0).tobytes()
with pytest.raises(TypeError):
ImageCms.ImageCmsProfile(1).tobytes()
def assert_aux_channel_preserved(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 = [
(-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():
assert_aux_channel_preserved(
mode="RGBA", transform_in_place=False, preserved_channel="A"
)
def test_preserve_auxiliary_channels_rgba_in_place():
assert_aux_channel_preserved(
mode="RGBA", transform_in_place=True, preserved_channel="A"
)
def test_preserve_auxiliary_channels_rgbx():
assert_aux_channel_preserved(
mode="RGBX", transform_in_place=False, preserved_channel="X"
)
def test_preserve_auxiliary_channels_rgbx_in_place():
assert_aux_channel_preserved(
mode="RGBX", transform_in_place=True, preserved_channel="X"
)
def test_auxiliary_channels_isolated():
# 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)