Pillow/Tests/test_imagecms.py
2024-02-21 08:11:01 +11:00

658 lines
21 KiB
Python

from __future__ import annotations
import datetime
import os
import re
import shutil
from io import BytesIO
from pathlib import Path
from typing import Any
import pytest
from PIL import Image, ImageMode, features
from .helper import (
assert_image,
assert_image_equal,
assert_image_similar,
assert_image_similar_tofile,
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() -> None:
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() -> None:
if not HAVE_PROFILE:
pytest.skip("SRGB profile not available")
def test_sanity() -> None:
# basic smoke test.
# this mostly follows the cms_test outline.
with pytest.warns(DeprecationWarning):
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+(\.\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_flags() -> None:
assert ImageCms.Flags.NONE == 0
assert ImageCms.Flags.GRIDPOINTS(0) == ImageCms.Flags.NONE
assert ImageCms.Flags.GRIDPOINTS(256) == ImageCms.Flags.NONE
assert ImageCms.Flags.GRIDPOINTS(255) == (255 << 16)
assert ImageCms.Flags.GRIDPOINTS(-1) == ImageCms.Flags.GRIDPOINTS(255)
assert ImageCms.Flags.GRIDPOINTS(511) == ImageCms.Flags.GRIDPOINTS(255)
def test_name() -> None:
skip_missing()
# get profile information for file
assert (
ImageCms.getProfileName(SRGB).strip()
== "IEC 61966-2-1 Default RGB Colour Space - sRGB"
)
def test_info() -> None:
skip_missing()
assert ImageCms.getProfileInfo(SRGB).splitlines() == [
"sRGB IEC61966-2-1 black scaled",
"",
"Copyright International Color Consortium, 2009",
"",
]
def test_copyright() -> None:
skip_missing()
assert (
ImageCms.getProfileCopyright(SRGB).strip()
== "Copyright International Color Consortium, 2009"
)
def test_manufacturer() -> None:
skip_missing()
assert ImageCms.getProfileManufacturer(SRGB).strip() == ""
def test_model() -> None:
skip_missing()
assert (
ImageCms.getProfileModel(SRGB).strip()
== "IEC 61966-2-1 Default RGB Colour Space - sRGB"
)
def test_description() -> None:
skip_missing()
assert (
ImageCms.getProfileDescription(SRGB).strip() == "sRGB IEC61966-2-1 black scaled"
)
def test_intent() -> None:
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() -> None:
# 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() -> None:
# 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() -> None:
# Test mode mismatch
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
with pytest.raises(ValueError, match="mode mismatch"):
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, match="cannot open profile file"):
ImageCms.profileToProfile(im, "foo", "bar")
with pytest.raises(ImageCms.PyCMSError, match="cannot open profile file"):
ImageCms.buildTransform("foo", "bar", "RGB", "RGB")
with pytest.raises(ImageCms.PyCMSError, match="Invalid type for Profile"):
ImageCms.getProfileName(None)
skip_missing()
# Python <= 3.9: "an integer is required (got type NoneType)"
# Python > 3.9: "'NoneType' object cannot be interpreted as an integer"
with pytest.raises(ImageCms.PyCMSError, match="integer"):
ImageCms.isIntentSupported(SRGB, None, None)
def test_display_profile() -> None:
# try fetching the profile for the current display device
ImageCms.get_display_profile()
def test_lab_color_profile() -> None:
ImageCms.createProfile("LAB", 5000)
ImageCms.createProfile("LAB", 6500)
def test_unsupported_color_space() -> None:
with pytest.raises(
ImageCms.PyCMSError,
match=re.escape(
"Color space not supported for on-the-fly profile creation (unsupported)"
),
):
ImageCms.createProfile("unsupported")
def test_invalid_color_temperature() -> None:
with pytest.raises(
ImageCms.PyCMSError,
match='Color temperature must be numeric, "invalid" not valid',
):
ImageCms.createProfile("LAB", "invalid")
@pytest.mark.parametrize("flag", ("my string", -1))
def test_invalid_flag(flag: str | int) -> None:
with hopper() as im:
with pytest.raises(
ImageCms.PyCMSError, match="flags must be an integer between 0 and "
):
ImageCms.profileToProfile(im, "foo", "bar", flags=flag)
def test_simple_lab() -> None:
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() -> None:
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.
assert_image_similar_tofile(i, "Tests/images/hopper.Lab.tif", 3.5)
def test_lab_srgb() -> None:
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() -> None:
# 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() -> None:
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() -> None:
skip_missing()
o = ImageCms.getOpenProfile(SRGB)
p = o.profile
def assert_truncated_tuple_equal(
tup1: tuple[Any, ...], tup2: tuple[Any, ...], digits: int = 10
) -> None:
# Helper function to reduce precision of tuples of floats
# recursively and then check equality.
power = 10**digits
def truncate_tuple(tuple_value: tuple[Any, ...]) -> tuple[Any, ...]:
return tuple(
(
truncate_tuple(val)
if isinstance(val, tuple)
else int(val * power) / power
)
for val in tuple_value
)
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: Path) -> None:
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() -> None:
"""Profile init type safety
prepatch, these would segfault, postpatch they should emit a typeerror
"""
with pytest.raises(TypeError, match="Invalid type for Profile"):
ImageCms.ImageCmsProfile(0).tobytes()
with pytest.raises(TypeError, match="Invalid type for Profile"):
ImageCms.ImageCmsProfile(1).tobytes()
def assert_aux_channel_preserved(
mode: str, transform_in_place: bool, preserved_channel: str
) -> None:
def create_test_image() -> Image.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() -> None:
assert_aux_channel_preserved(
mode="RGBA", transform_in_place=False, preserved_channel="A"
)
def test_preserve_auxiliary_channels_rgba_in_place() -> None:
assert_aux_channel_preserved(
mode="RGBA", transform_in_place=True, preserved_channel="A"
)
def test_preserve_auxiliary_channels_rgbx() -> None:
assert_aux_channel_preserved(
mode="RGBX", transform_in_place=False, preserved_channel="X"
)
def test_preserve_auxiliary_channels_rgbx_in_place() -> None:
assert_aux_channel_preserved(
mode="RGBX", transform_in_place=True, preserved_channel="X"
)
def test_auxiliary_channels_isolated() -> None:
# 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)
@pytest.mark.parametrize("mode", ("RGB", "RGBA", "RGBX"))
def test_rgb_lab(mode: str) -> None:
im = Image.new(mode, (1, 1))
converted_im = im.convert("LAB")
assert converted_im.getpixel((0, 0)) == (0, 128, 128)
im = Image.new("LAB", (1, 1), (255, 0, 0))
converted_im = im.convert(mode)
assert converted_im.getpixel((0, 0))[:3] == (0, 255, 255)
def test_deprecation() -> None:
with pytest.warns(DeprecationWarning):
assert ImageCms.DESCRIPTION.strip().startswith("pyCMS")
with pytest.warns(DeprecationWarning):
assert ImageCms.VERSION == "1.0.0 pil"
with pytest.warns(DeprecationWarning):
assert isinstance(ImageCms.FLAGS, dict)