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Pillow/Tests/test_file_jpeg.py
Hugo van Kemenade 5747267eb3 Fix PT018: Assert only one thing
2024-08-17 11:46:15 +03:00

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from __future__ import annotations
import os
import re
import warnings
from io import BytesIO
from pathlib import Path
from types import ModuleType
from typing import Any, cast
import pytest
from PIL import (
ExifTags,
Image,
ImageFile,
ImageOps,
JpegImagePlugin,
UnidentifiedImageError,
features,
)
from .helper import (
assert_image,
assert_image_equal,
assert_image_equal_tofile,
assert_image_similar,
assert_image_similar_tofile,
cjpeg_available,
djpeg_available,
hopper,
is_win32,
mark_if_feature_version,
skip_unless_feature,
)
ElementTree: ModuleType | None
try:
from defusedxml import ElementTree
except ImportError:
ElementTree = None
TEST_FILE = "Tests/images/hopper.jpg"
@skip_unless_feature("jpg")
class TestFileJpeg:
def roundtrip_with_bytes(
self, im: Image.Image, **options: Any
) -> tuple[JpegImagePlugin.JpegImageFile, int]:
out = BytesIO()
im.save(out, "JPEG", **options)
test_bytes = out.tell()
out.seek(0)
reloaded = cast(JpegImagePlugin.JpegImageFile, Image.open(out))
return reloaded, test_bytes
def roundtrip(
self, im: Image.Image, **options: Any
) -> JpegImagePlugin.JpegImageFile:
return self.roundtrip_with_bytes(im, **options)[0]
def gen_random_image(self, size: tuple[int, int], mode: str = "RGB") -> Image.Image:
"""Generates a very hard to compress file
:param size: tuple
:param mode: optional image mode
"""
return Image.frombytes(mode, size, os.urandom(size[0] * size[1] * len(mode)))
def test_sanity(self) -> None:
# internal version number
version = features.version_codec("jpg")
assert version is not None
assert re.search(r"\d+\.\d+$", version)
with Image.open(TEST_FILE) as im:
im.load()
assert im.mode == "RGB"
assert im.size == (128, 128)
assert im.format == "JPEG"
assert im.get_format_mimetype() == "image/jpeg"
@pytest.mark.parametrize("size", ((1, 0), (0, 1), (0, 0)))
def test_zero(self, size: tuple[int, int], tmp_path: Path) -> None:
f = str(tmp_path / "temp.jpg")
im = Image.new("RGB", size)
with pytest.raises(ValueError):
im.save(f)
def test_app(self) -> None:
# Test APP/COM reader (@PIL135)
with Image.open(TEST_FILE) as im:
assert im.applist[0] == ("APP0", b"JFIF\x00\x01\x01\x01\x00`\x00`\x00\x00")
assert im.applist[1] == (
"COM",
b"File written by Adobe Photoshop\xa8 4.0\x00",
)
assert len(im.applist) == 2
assert im.info["comment"] == b"File written by Adobe Photoshop\xa8 4.0\x00"
assert im.app["COM"] == im.info["comment"]
def test_comment_write(self) -> None:
with Image.open(TEST_FILE) as im:
assert im.info["comment"] == b"File written by Adobe Photoshop\xa8 4.0\x00"
# Test that existing comment is saved by default
out = BytesIO()
im.save(out, format="JPEG")
with Image.open(out) as reloaded:
assert im.info["comment"] == reloaded.info["comment"]
# Ensure that a blank comment causes any existing comment to be removed
for comment in ("", b"", None):
out = BytesIO()
im.save(out, format="JPEG", comment=comment)
with Image.open(out) as reloaded:
assert "comment" not in reloaded.info
# Test that a comment argument overrides the default comment
for comment in ("Test comment text", b"Test comment text"):
out = BytesIO()
im.save(out, format="JPEG", comment=comment)
with Image.open(out) as reloaded:
assert reloaded.info["comment"] == b"Test comment text"
def test_cmyk(self) -> None:
# Test CMYK handling. Thanks to Tim and Charlie for test data,
# Michael for getting me to look one more time.
f = "Tests/images/pil_sample_cmyk.jpg"
with Image.open(f) as im:
# the source image has red pixels in the upper left corner.
c, m, y, k = (x / 255.0 for x in im.getpixel((0, 0)))
assert c == 0.0
assert m > 0.8
assert y > 0.8
assert k == 0.0
# the opposite corner is black
c, m, y, k = (
x / 255.0 for x in im.getpixel((im.size[0] - 1, im.size[1] - 1))
)
assert k > 0.9
# roundtrip, and check again
im = self.roundtrip(im)
c, m, y, k = (x / 255.0 for x in im.getpixel((0, 0)))
assert c == 0.0
assert m > 0.8
assert y > 0.8
assert k == 0.0
c, m, y, k = (
x / 255.0 for x in im.getpixel((im.size[0] - 1, im.size[1] - 1))
)
assert k > 0.9
def test_rgb(self) -> None:
def getchannels(im: JpegImagePlugin.JpegImageFile) -> tuple[int, ...]:
return tuple(v[0] for v in im.layer)
im = hopper()
im_ycbcr = self.roundtrip(im)
assert getchannels(im_ycbcr) == (1, 2, 3)
assert_image_similar(im, im_ycbcr, 17)
im_rgb = self.roundtrip(im, keep_rgb=True)
assert getchannels(im_rgb) == (ord("R"), ord("G"), ord("B"))
assert_image_similar(im, im_rgb, 12)
@pytest.mark.parametrize(
"test_image_path",
[TEST_FILE, "Tests/images/pil_sample_cmyk.jpg"],
)
def test_dpi(self, test_image_path: str) -> None:
def test(xdpi: int, ydpi: int | None = None) -> tuple[int, int] | None:
with Image.open(test_image_path) as im:
im = self.roundtrip(im, dpi=(xdpi, ydpi or xdpi))
return im.info.get("dpi")
assert test(72) == (72, 72)
assert test(300) == (300, 300)
assert test(100, 200) == (100, 200)
assert test(0) is None # square pixels
@mark_if_feature_version(
pytest.mark.valgrind_known_error, "libjpeg_turbo", "2.0", reason="Known Failing"
)
def test_icc(self, tmp_path: Path) -> None:
# Test ICC support
with Image.open("Tests/images/rgb.jpg") as im1:
icc_profile = im1.info["icc_profile"]
assert len(icc_profile) == 3144
# Roundtrip via physical file.
f = str(tmp_path / "temp.jpg")
im1.save(f, icc_profile=icc_profile)
with Image.open(f) as im2:
assert im2.info.get("icc_profile") == icc_profile
# Roundtrip via memory buffer.
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), icc_profile=icc_profile)
assert_image_equal(im1, im2)
assert not im1.info.get("icc_profile")
assert im2.info.get("icc_profile")
@pytest.mark.parametrize(
"n",
(
0,
1,
3,
4,
5,
65533 - 14, # full JPEG marker block
65533 - 14 + 1, # full block plus one byte
ImageFile.MAXBLOCK, # full buffer block
ImageFile.MAXBLOCK + 1, # full buffer block plus one byte
ImageFile.MAXBLOCK * 4 + 3, # large block
),
)
def test_icc_big(self, n: int) -> None:
# Make sure that the "extra" support handles large blocks
# The ICC APP marker can store 65519 bytes per marker, so
# using a 4-byte test code should allow us to detect out of
# order issues.
icc_profile = (b"Test" * int(n / 4 + 1))[:n]
assert len(icc_profile) == n # sanity
im1 = self.roundtrip(hopper(), icc_profile=icc_profile)
assert im1.info.get("icc_profile") == (icc_profile or None)
@mark_if_feature_version(
pytest.mark.valgrind_known_error, "libjpeg_turbo", "2.0", reason="Known Failing"
)
def test_large_icc_meta(self, tmp_path: Path) -> None:
# https://github.com/python-pillow/Pillow/issues/148
# Sometimes the meta data on the icc_profile block is bigger than
# Image.MAXBLOCK or the image size.
with Image.open("Tests/images/icc_profile_big.jpg") as im:
f = str(tmp_path / "temp.jpg")
icc_profile = im.info["icc_profile"]
# Should not raise OSError for image with icc larger than image size.
im.save(
f,
progressive=True,
quality=95,
icc_profile=icc_profile,
optimize=True,
)
with Image.open("Tests/images/flower2.jpg") as im:
f = str(tmp_path / "temp2.jpg")
im.save(f, progressive=True, quality=94, icc_profile=b" " * 53955)
with Image.open("Tests/images/flower2.jpg") as im:
f = str(tmp_path / "temp3.jpg")
im.save(f, progressive=True, quality=94, exif=b" " * 43668)
def test_optimize(self) -> None:
im1, im1_bytes = self.roundtrip_with_bytes(hopper())
im2, im2_bytes = self.roundtrip_with_bytes(hopper(), optimize=0)
im3, im3_bytes = self.roundtrip_with_bytes(hopper(), optimize=1)
assert_image_equal(im1, im2)
assert_image_equal(im1, im3)
assert im1_bytes >= im2_bytes
assert im1_bytes >= im3_bytes
def test_optimize_large_buffer(self, tmp_path: Path) -> None:
# https://github.com/python-pillow/Pillow/issues/148
f = str(tmp_path / "temp.jpg")
# this requires ~ 1.5x Image.MAXBLOCK
im = Image.new("RGB", (4096, 4096), 0xFF3333)
im.save(f, format="JPEG", optimize=True)
def test_progressive(self) -> None:
im1, im1_bytes = self.roundtrip_with_bytes(hopper())
im2 = self.roundtrip(hopper(), progressive=False)
im3, im3_bytes = self.roundtrip_with_bytes(hopper(), progressive=True)
assert not im1.info.get("progressive")
assert not im2.info.get("progressive")
assert im3.info.get("progressive")
assert_image_equal(im1, im3)
assert im1_bytes >= im3_bytes
def test_progressive_large_buffer(self, tmp_path: Path) -> None:
f = str(tmp_path / "temp.jpg")
# this requires ~ 1.5x Image.MAXBLOCK
im = Image.new("RGB", (4096, 4096), 0xFF3333)
im.save(f, format="JPEG", progressive=True)
def test_progressive_large_buffer_highest_quality(self, tmp_path: Path) -> None:
f = str(tmp_path / "temp.jpg")
im = self.gen_random_image((255, 255))
# this requires more bytes than pixels in the image
im.save(f, format="JPEG", progressive=True, quality=100)
def test_progressive_cmyk_buffer(self) -> None:
# Issue 2272, quality 90 cmyk image is tripping the large buffer bug.
f = BytesIO()
im = self.gen_random_image((256, 256), "CMYK")
im.save(f, format="JPEG", progressive=True, quality=94)
def test_large_exif(self, tmp_path: Path) -> None:
# https://github.com/python-pillow/Pillow/issues/148
f = str(tmp_path / "temp.jpg")
im = hopper()
im.save(f, "JPEG", quality=90, exif=b"1" * 65533)
with pytest.raises(ValueError):
im.save(f, "JPEG", quality=90, exif=b"1" * 65534)
def test_exif_typeerror(self) -> None:
with Image.open("Tests/images/exif_typeerror.jpg") as im:
# Should not raise a TypeError
im._getexif()
def test_exif_gps(self, tmp_path: Path) -> None:
expected_exif_gps = {
0: b"\x00\x00\x00\x01",
2: 4294967295,
5: b"\x01",
30: 65535,
29: "1999:99:99 99:99:99",
}
gps_index = 34853
# Reading
with Image.open("Tests/images/exif_gps.jpg") as im:
exif = im._getexif()
assert exif[gps_index] == expected_exif_gps
# Writing
f = str(tmp_path / "temp.jpg")
exif = Image.Exif()
exif[gps_index] = expected_exif_gps
hopper().save(f, exif=exif)
with Image.open(f) as reloaded:
exif = reloaded._getexif()
assert exif[gps_index] == expected_exif_gps
def test_empty_exif_gps(self) -> None:
with Image.open("Tests/images/empty_gps_ifd.jpg") as im:
exif = im.getexif()
del exif[0x8769]
# Assert that it needs to be transposed
assert exif[0x0112] == Image.Transpose.TRANSVERSE
# Assert that the GPS IFD is present and empty
assert exif.get_ifd(0x8825) == {}
transposed = ImageOps.exif_transpose(im)
assert transposed is not None
exif = transposed.getexif()
assert exif.get_ifd(0x8825) == {}
# Assert that it was transposed
assert 0x0112 not in exif
def test_exif_equality(self) -> None:
# In 7.2.0, Exif rationals were changed to be read as
# TiffImagePlugin.IFDRational. This class had a bug in __eq__,
# breaking the self-equality of Exif data
exifs = []
for i in range(2):
with Image.open("Tests/images/exif-200dpcm.jpg") as im:
exifs.append(im._getexif())
assert exifs[0] == exifs[1]
def test_exif_rollback(self) -> None:
# rolling back exif support in 3.1 to pre-3.0 formatting.
# expected from 2.9, with b/u qualifiers switched for 3.2 compatibility
# this test passes on 2.9 and 3.1, but not 3.0
expected_exif = {
34867: 4294967295,
258: (24, 24, 24),
36867: "2099:09:29 10:10:10",
34853: {
0: b"\x00\x00\x00\x01",
2: 4294967295,
5: b"\x01",
30: 65535,
29: "1999:99:99 99:99:99",
},
296: 65535,
34665: 185,
41994: 65535,
514: 4294967295,
271: "Make",
272: "XXX-XXX",
305: "PIL",
42034: (1, 1, 1, 1),
42035: "LensMake",
34856: b"\xaa\xaa\xaa\xaa\xaa\xaa",
282: 4294967295,
33434: 4294967295,
}
with Image.open("Tests/images/exif_gps.jpg") as im:
exif = im._getexif()
for tag, value in expected_exif.items():
assert value == exif[tag]
def test_exif_gps_typeerror(self) -> None:
with Image.open("Tests/images/exif_gps_typeerror.jpg") as im:
# Should not raise a TypeError
im._getexif()
def test_progressive_compat(self) -> None:
im1 = self.roundtrip(hopper())
assert not im1.info.get("progressive")
assert not im1.info.get("progression")
im2 = self.roundtrip(hopper(), progressive=0)
im3 = self.roundtrip(hopper(), progression=0) # compatibility
assert not im2.info.get("progressive")
assert not im2.info.get("progression")
assert not im3.info.get("progressive")
assert not im3.info.get("progression")
im2 = self.roundtrip(hopper(), progressive=1)
im3 = self.roundtrip(hopper(), progression=1) # compatibility
assert_image_equal(im1, im2)
assert_image_equal(im1, im3)
assert im2.info.get("progressive")
assert im2.info.get("progression")
assert im3.info.get("progressive")
assert im3.info.get("progression")
def test_quality(self) -> None:
im1, im1_bytes = self.roundtrip_with_bytes(hopper())
im2, im2_bytes = self.roundtrip_with_bytes(hopper(), quality=50)
assert_image(im1, im2.mode, im2.size)
assert im1_bytes >= im2_bytes
im3, im3_bytes = self.roundtrip_with_bytes(hopper(), quality=0)
assert_image(im1, im3.mode, im3.size)
assert im2_bytes > im3_bytes
def test_smooth(self) -> None:
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), smooth=100)
assert_image(im1, im2.mode, im2.size)
def test_subsampling(self) -> None:
def getsampling(
im: JpegImagePlugin.JpegImageFile,
) -> tuple[int, int, int, int, int, int]:
layer = im.layer
return layer[0][1:3] + layer[1][1:3] + layer[2][1:3]
# experimental API
for subsampling in (-1, 3): # (default, invalid)
im = self.roundtrip(hopper(), subsampling=subsampling)
assert getsampling(im) == (2, 2, 1, 1, 1, 1)
for subsampling1 in (0, "4:4:4"):
im = self.roundtrip(hopper(), subsampling=subsampling1)
assert getsampling(im) == (1, 1, 1, 1, 1, 1)
for subsampling1 in (1, "4:2:2"):
im = self.roundtrip(hopper(), subsampling=subsampling1)
assert getsampling(im) == (2, 1, 1, 1, 1, 1)
for subsampling1 in (2, "4:2:0", "4:1:1"):
im = self.roundtrip(hopper(), subsampling=subsampling1)
assert getsampling(im) == (2, 2, 1, 1, 1, 1)
# RGB colorspace
for subsampling1 in (-1, 0, "4:4:4"):
# "4:4:4" doesn't really make sense for RGB, but the conversion
# to an integer happens at a higher level
im = self.roundtrip(hopper(), keep_rgb=True, subsampling=subsampling1)
assert getsampling(im) == (1, 1, 1, 1, 1, 1)
for subsampling1 in (1, "4:2:2", 2, "4:2:0", 3):
with pytest.raises(OSError):
self.roundtrip(hopper(), keep_rgb=True, subsampling=subsampling1)
with pytest.raises(TypeError):
self.roundtrip(hopper(), subsampling="1:1:1")
def test_exif(self) -> None:
with Image.open("Tests/images/pil_sample_rgb.jpg") as im:
info = im._getexif()
assert info[305] == "Adobe Photoshop CS Macintosh"
def test_get_child_images(self) -> None:
with Image.open("Tests/images/flower.jpg") as im:
ims = im.get_child_images()
assert len(ims) == 1
assert_image_similar_tofile(ims[0], "Tests/images/flower_thumbnail.png", 2.1)
def test_mp(self) -> None:
with Image.open("Tests/images/pil_sample_rgb.jpg") as im:
assert im._getmp() is None
def test_quality_keep(self, tmp_path: Path) -> None:
# RGB
with Image.open("Tests/images/hopper.jpg") as im:
f = str(tmp_path / "temp.jpg")
im.save(f, quality="keep")
# Grayscale
with Image.open("Tests/images/hopper_gray.jpg") as im:
f = str(tmp_path / "temp.jpg")
im.save(f, quality="keep")
# CMYK
with Image.open("Tests/images/pil_sample_cmyk.jpg") as im:
f = str(tmp_path / "temp.jpg")
im.save(f, quality="keep")
def test_junk_jpeg_header(self) -> None:
# https://github.com/python-pillow/Pillow/issues/630
filename = "Tests/images/junk_jpeg_header.jpg"
with Image.open(filename):
pass
def test_ff00_jpeg_header(self) -> None:
filename = "Tests/images/jpeg_ff00_header.jpg"
with Image.open(filename):
pass
@mark_if_feature_version(
pytest.mark.valgrind_known_error, "libjpeg_turbo", "2.0", reason="Known Failing"
)
def test_truncated_jpeg_should_read_all_the_data(self) -> None:
filename = "Tests/images/truncated_jpeg.jpg"
ImageFile.LOAD_TRUNCATED_IMAGES = True
with Image.open(filename) as im:
im.load()
ImageFile.LOAD_TRUNCATED_IMAGES = False
assert im.getbbox() is not None
def test_truncated_jpeg_throws_oserror(self) -> None:
filename = "Tests/images/truncated_jpeg.jpg"
with Image.open(filename) as im:
with pytest.raises(OSError):
im.load()
# Test that the error is raised if loaded a second time
with pytest.raises(OSError):
im.load()
@mark_if_feature_version(
pytest.mark.valgrind_known_error, "libjpeg_turbo", "2.0", reason="Known Failing"
)
def test_qtables(self, tmp_path: Path) -> None:
def _n_qtables_helper(n: int, test_file: str) -> None:
with Image.open(test_file) as im:
f = str(tmp_path / "temp.jpg")
im.save(f, qtables=[[n] * 64] * n)
with Image.open(f) as im:
assert len(im.quantization) == n
reloaded = self.roundtrip(im, qtables="keep")
assert im.quantization == reloaded.quantization
assert max(reloaded.quantization[0]) <= 255
with Image.open("Tests/images/hopper.jpg") as im:
qtables = im.quantization
reloaded = self.roundtrip(im, qtables=qtables, subsampling=0)
assert im.quantization == reloaded.quantization
assert_image_similar(im, self.roundtrip(im, qtables="web_low"), 30)
assert_image_similar(im, self.roundtrip(im, qtables="web_high"), 30)
assert_image_similar(im, self.roundtrip(im, qtables="keep"), 30)
# valid bounds for baseline qtable
bounds_qtable = [int(s) for s in ("255 1 " * 32).split(None)]
im2 = self.roundtrip(im, qtables=[bounds_qtable])
assert im2.quantization == {0: bounds_qtable}
# values from wizard.txt in jpeg9-a src package.
standard_l_qtable = [
int(s)
for s in """
16 11 10 16 24 40 51 61
12 12 14 19 26 58 60 55
14 13 16 24 40 57 69 56
14 17 22 29 51 87 80 62
18 22 37 56 68 109 103 77
24 35 55 64 81 104 113 92
49 64 78 87 103 121 120 101
72 92 95 98 112 100 103 99
""".split(
None
)
]
standard_chrominance_qtable = [
int(s)
for s in """
17 18 24 47 99 99 99 99
18 21 26 66 99 99 99 99
24 26 56 99 99 99 99 99
47 66 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
""".split(
None
)
]
# list of qtable lists
assert_image_similar(
im,
self.roundtrip(
im, qtables=[standard_l_qtable, standard_chrominance_qtable]
),
30,
)
# tuple of qtable lists
assert_image_similar(
im,
self.roundtrip(
im, qtables=(standard_l_qtable, standard_chrominance_qtable)
),
30,
)
# dict of qtable lists
assert_image_similar(
im,
self.roundtrip(
im, qtables={0: standard_l_qtable, 1: standard_chrominance_qtable}
),
30,
)
_n_qtables_helper(1, "Tests/images/hopper_gray.jpg")
_n_qtables_helper(1, "Tests/images/pil_sample_rgb.jpg")
_n_qtables_helper(2, "Tests/images/pil_sample_rgb.jpg")
_n_qtables_helper(3, "Tests/images/pil_sample_rgb.jpg")
_n_qtables_helper(1, "Tests/images/pil_sample_cmyk.jpg")
_n_qtables_helper(2, "Tests/images/pil_sample_cmyk.jpg")
_n_qtables_helper(3, "Tests/images/pil_sample_cmyk.jpg")
_n_qtables_helper(4, "Tests/images/pil_sample_cmyk.jpg")
# not a sequence
with pytest.raises(ValueError):
self.roundtrip(im, qtables="a")
# sequence wrong length
with pytest.raises(ValueError):
self.roundtrip(im, qtables=[])
# sequence wrong length
with pytest.raises(ValueError):
self.roundtrip(im, qtables=[1, 2, 3, 4, 5])
# qtable entry not a sequence
with pytest.raises(ValueError):
self.roundtrip(im, qtables=[1])
# qtable entry has wrong number of items
with pytest.raises(ValueError):
self.roundtrip(im, qtables=[[1, 2, 3, 4]])
def test_load_16bit_qtables(self) -> None:
with Image.open("Tests/images/hopper_16bit_qtables.jpg") as im:
assert len(im.quantization) == 2
assert len(im.quantization[0]) == 64
assert max(im.quantization[0]) > 255
def test_save_multiple_16bit_qtables(self) -> None:
with Image.open("Tests/images/hopper_16bit_qtables.jpg") as im:
im2 = self.roundtrip(im, qtables="keep")
assert im.quantization == im2.quantization
def test_save_single_16bit_qtable(self) -> None:
with Image.open("Tests/images/hopper_16bit_qtables.jpg") as im:
im2 = self.roundtrip(im, qtables={0: im.quantization[0]})
assert len(im2.quantization) == 1
assert im2.quantization[0] == im.quantization[0]
def test_save_low_quality_baseline_qtables(self) -> None:
with Image.open(TEST_FILE) as im:
im2 = self.roundtrip(im, quality=10)
assert len(im2.quantization) == 2
assert max(im2.quantization[0]) <= 255
assert max(im2.quantization[1]) <= 255
@pytest.mark.parametrize(
"blocks, rows, markers",
((0, 0, 0), (1, 0, 15), (3, 0, 5), (8, 0, 1), (0, 1, 3), (0, 2, 1)),
)
def test_restart_markers(self, blocks: int, rows: int, markers: int) -> None:
im = Image.new("RGB", (32, 32)) # 16 MCUs
out = BytesIO()
im.save(
out,
format="JPEG",
restart_marker_blocks=blocks,
restart_marker_rows=rows,
# force 8x8 pixel MCUs
subsampling=0,
)
assert len(re.findall(b"\xff[\xd0-\xd7]", out.getvalue())) == markers
@pytest.mark.skipif(not djpeg_available(), reason="djpeg not available")
def test_load_djpeg(self) -> None:
with Image.open(TEST_FILE) as img:
img.load_djpeg()
assert_image_similar_tofile(img, TEST_FILE, 5)
@pytest.mark.skipif(not cjpeg_available(), reason="cjpeg not available")
def test_save_cjpeg(self, tmp_path: Path) -> None:
with Image.open(TEST_FILE) as img:
tempfile = str(tmp_path / "temp.jpg")
JpegImagePlugin._save_cjpeg(img, BytesIO(), tempfile)
# Default save quality is 75%, so a tiny bit of difference is alright
assert_image_similar_tofile(img, tempfile, 17)
def test_no_duplicate_0x1001_tag(self) -> None:
# Arrange
tag_ids = {v: k for k, v in ExifTags.TAGS.items()}
# Assert
assert tag_ids["RelatedImageWidth"] == 0x1001
assert tag_ids["RelatedImageLength"] == 0x1002
def test_MAXBLOCK_scaling(self, tmp_path: Path) -> None:
im = self.gen_random_image((512, 512))
f = str(tmp_path / "temp.jpeg")
im.save(f, quality=100, optimize=True)
with Image.open(f) as reloaded:
# none of these should crash
reloaded.save(f, quality="keep")
reloaded.save(f, quality="keep", progressive=True)
reloaded.save(f, quality="keep", optimize=True)
def test_bad_mpo_header(self) -> None:
"""Treat unknown MPO as JPEG"""
# Arrange
# Act
# Shouldn't raise error
fn = "Tests/images/sugarshack_bad_mpo_header.jpg"
with pytest.warns(UserWarning, Image.open, fn) as im:
# Assert
assert im.format == "JPEG"
@pytest.mark.parametrize("mode", ("1", "L", "RGB", "RGBX", "CMYK", "YCbCr"))
def test_save_correct_modes(self, mode: str) -> None:
out = BytesIO()
img = Image.new(mode, (20, 20))
img.save(out, "JPEG")
@pytest.mark.parametrize("mode", ("LA", "La", "RGBA", "RGBa", "P"))
def test_save_wrong_modes(self, mode: str) -> None:
# ref https://github.com/python-pillow/Pillow/issues/2005
out = BytesIO()
img = Image.new(mode, (20, 20))
with pytest.raises(OSError):
img.save(out, "JPEG")
def test_save_tiff_with_dpi(self, tmp_path: Path) -> None:
# Arrange
outfile = str(tmp_path / "temp.tif")
with Image.open("Tests/images/hopper.tif") as im:
# Act
im.save(outfile, "JPEG", dpi=im.info["dpi"])
# Assert
with Image.open(outfile) as reloaded:
reloaded.load()
assert im.info["dpi"] == reloaded.info["dpi"]
def test_save_dpi_rounding(self, tmp_path: Path) -> None:
outfile = str(tmp_path / "temp.jpg")
with Image.open("Tests/images/hopper.jpg") as im:
im.save(outfile, dpi=(72.2, 72.2))
with Image.open(outfile) as reloaded:
assert reloaded.info["dpi"] == (72, 72)
im.save(outfile, dpi=(72.8, 72.8))
with Image.open(outfile) as reloaded:
assert reloaded.info["dpi"] == (73, 73)
def test_dpi_tuple_from_exif(self) -> None:
# Arrange
# This Photoshop CC 2017 image has DPI in EXIF not metadata
# EXIF XResolution is (2000000, 10000)
with Image.open("Tests/images/photoshop-200dpi.jpg") as im:
# Act / Assert
assert im.info.get("dpi") == (200, 200)
def test_dpi_int_from_exif(self) -> None:
# Arrange
# This image has DPI in EXIF not metadata
# EXIF XResolution is 72
with Image.open("Tests/images/exif-72dpi-int.jpg") as im:
# Act / Assert
assert im.info.get("dpi") == (72, 72)
def test_dpi_from_dpcm_exif(self) -> None:
# Arrange
# This is photoshop-200dpi.jpg with EXIF resolution unit set to cm:
# exiftool -exif:ResolutionUnit=cm photoshop-200dpi.jpg
with Image.open("Tests/images/exif-200dpcm.jpg") as im:
# Act / Assert
assert im.info.get("dpi") == (508, 508)
def test_dpi_exif_zero_division(self) -> None:
# Arrange
# This is photoshop-200dpi.jpg with EXIF resolution set to 0/0:
# exiftool -XResolution=0/0 -YResolution=0/0 photoshop-200dpi.jpg
with Image.open("Tests/images/exif-dpi-zerodivision.jpg") as im:
# Act / Assert
# This should return the default, and not raise a ZeroDivisionError
assert im.info.get("dpi") == (72, 72)
def test_dpi_exif_string(self) -> None:
# Arrange
# 0x011A tag in this exif contains string '300300\x02'
with Image.open("Tests/images/broken_exif_dpi.jpg") as im:
# Act / Assert
# This should return the default
assert im.info.get("dpi") == (72, 72)
def test_dpi_exif_truncated(self) -> None:
# Arrange
with Image.open("Tests/images/truncated_exif_dpi.jpg") as im:
# Act / Assert
# This should return the default
assert im.info.get("dpi") == (72, 72)
def test_no_dpi_in_exif(self) -> None:
# Arrange
# This is photoshop-200dpi.jpg with resolution removed from EXIF:
# exiftool "-*resolution*"= photoshop-200dpi.jpg
with Image.open("Tests/images/no-dpi-in-exif.jpg") as im:
# Act / Assert
# "When the image resolution is unknown, 72 [dpi] is designated."
# https://exiv2.org/tags.html
assert im.info.get("dpi") == (72, 72)
def test_invalid_exif(self) -> None:
# This is no-dpi-in-exif with the tiff header of the exif block
# hexedited from MM * to FF FF FF FF
with Image.open("Tests/images/invalid-exif.jpg") as im:
# This should return the default, and not a SyntaxError or
# OSError for unidentified image.
assert im.info.get("dpi") == (72, 72)
@mark_if_feature_version(
pytest.mark.valgrind_known_error, "libjpeg_turbo", "2.0", reason="Known Failing"
)
def test_exif_x_resolution(self, tmp_path: Path) -> None:
with Image.open("Tests/images/flower.jpg") as im:
exif = im.getexif()
assert exif[282] == 180
out = str(tmp_path / "out.jpg")
with warnings.catch_warnings():
im.save(out, exif=exif)
with Image.open(out) as reloaded:
assert reloaded.getexif()[282] == 180
def test_invalid_exif_x_resolution(self) -> None:
# When no x or y resolution is defined in EXIF
with Image.open("Tests/images/invalid-exif-without-x-resolution.jpg") as im:
# This should return the default, and not a ValueError or
# OSError for an unidentified image.
assert im.info.get("dpi") == (72, 72)
def test_ifd_offset_exif(self) -> None:
# Arrange
# This image has been manually hexedited to have an IFD offset of 10,
# in contrast to normal 8
with Image.open("Tests/images/exif-ifd-offset.jpg") as im:
# Act / Assert
assert im._getexif()[306] == "2017:03:13 23:03:09"
def test_multiple_exif(self) -> None:
with Image.open("Tests/images/multiple_exif.jpg") as im:
assert im.getexif()[270] == "firstsecond"
@mark_if_feature_version(
pytest.mark.valgrind_known_error, "libjpeg_turbo", "2.0", reason="Known Failing"
)
def test_photoshop(self) -> None:
with Image.open("Tests/images/photoshop-200dpi.jpg") as im:
assert im.info["photoshop"][0x03ED] == {
"XResolution": 200.0,
"DisplayedUnitsX": 1,
"YResolution": 200.0,
"DisplayedUnitsY": 1,
}
# Test that the image can still load, even with broken Photoshop data
# This image had the APP13 length hexedited to be smaller
assert_image_equal_tofile(im, "Tests/images/photoshop-200dpi-broken.jpg")
# This image does not contain a Photoshop header string
with Image.open("Tests/images/app13.jpg") as im:
assert "photoshop" not in im.info
def test_photoshop_malformed_and_multiple(self) -> None:
with Image.open("Tests/images/app13-multiple.jpg") as im:
assert "photoshop" in im.info
assert 24 == len(im.info["photoshop"])
apps_13_lengths = [len(v) for k, v in im.applist if k == "APP13"]
assert [65504, 24] == apps_13_lengths
def test_adobe_transform(self) -> None:
with Image.open("Tests/images/pil_sample_rgb.jpg") as im:
assert im.info["adobe_transform"] == 1
with Image.open("Tests/images/pil_sample_cmyk.jpg") as im:
assert im.info["adobe_transform"] == 2
# This image has been manually hexedited
# so that the APP14 reports its length to be 11,
# leaving no room for "adobe_transform"
with Image.open("Tests/images/truncated_app14.jpg") as im:
assert "adobe" in im.info
assert "adobe_transform" not in im.info
def test_icc_after_SOF(self) -> None:
with Image.open("Tests/images/icc-after-SOF.jpg") as im:
assert im.info["icc_profile"] == b"profile"
def test_jpeg_magic_number(self, monkeypatch: pytest.MonkeyPatch) -> None:
size = 4097
buffer = BytesIO(b"\xFF" * size) # Many xFF bytes
max_pos = 0
orig_read = buffer.read
def read(n: int | None = -1) -> bytes:
nonlocal max_pos
res = orig_read(n)
max_pos = max(max_pos, buffer.tell())
return res
monkeypatch.setattr(buffer, "read", read)
with pytest.raises(UnidentifiedImageError):
with Image.open(buffer):
pass
# Assert the entire file has not been read
assert 0 < max_pos < size
def test_getxmp(self) -> None:
with Image.open("Tests/images/xmp_test.jpg") as im:
if ElementTree is None:
with pytest.warns(
UserWarning,
match="XMP data cannot be read without defusedxml dependency",
):
assert im.getxmp() == {}
else:
assert "xmp" in im.info
xmp = im.getxmp()
description = xmp["xmpmeta"]["RDF"]["Description"]
assert description["DerivedFrom"] == {
"documentID": "8367D410E636EA95B7DE7EBA1C43A412",
"originalDocumentID": "8367D410E636EA95B7DE7EBA1C43A412",
}
assert description["Look"]["Description"]["Group"]["Alt"]["li"] == {
"lang": "x-default",
"text": "Profiles",
}
assert description["ToneCurve"]["Seq"]["li"] == ["0, 0", "255, 255"]
# Attribute
assert description["Version"] == "10.4"
if ElementTree is not None:
with Image.open("Tests/images/hopper.jpg") as im:
assert im.getxmp() == {}
def test_getxmp_no_prefix(self) -> None:
with Image.open("Tests/images/xmp_no_prefix.jpg") as im:
if ElementTree is None:
with pytest.warns(
UserWarning,
match="XMP data cannot be read without defusedxml dependency",
):
assert im.getxmp() == {}
else:
assert im.getxmp() == {"xmpmeta": {"key": "value"}}
def test_getxmp_padded(self) -> None:
with Image.open("Tests/images/xmp_padded.jpg") as im:
if ElementTree is None:
with pytest.warns(
UserWarning,
match="XMP data cannot be read without defusedxml dependency",
):
assert im.getxmp() == {}
else:
assert im.getxmp() == {"xmpmeta": None}
@pytest.mark.timeout(timeout=1)
def test_eof(self) -> None:
# Even though this decoder never says that it is finished
# the image should still end when there is no new data
class InfiniteMockPyDecoder(ImageFile.PyDecoder):
def decode(self, buffer: bytes) -> tuple[int, int]:
return 0, 0
Image.register_decoder("INFINITE", InfiniteMockPyDecoder)
with Image.open(TEST_FILE) as im:
im.tile = [
("INFINITE", (0, 0, 128, 128), 0, ("RGB", 0, 1)),
]
ImageFile.LOAD_TRUNCATED_IMAGES = True
im.load()
ImageFile.LOAD_TRUNCATED_IMAGES = False
def test_separate_tables(self) -> None:
im = hopper()
data = [] # [interchange, tables-only, image-only]
for streamtype in range(3):
out = BytesIO()
im.save(out, format="JPEG", streamtype=streamtype)
data.append(out.getvalue())
# SOI, EOI
for marker in b"\xff\xd8", b"\xff\xd9":
assert marker in data[1]
assert marker in data[2]
# DHT, DQT
for marker in b"\xff\xc4", b"\xff\xdb":
assert marker in data[1]
assert marker not in data[2]
# SOF0, SOS, APP0 (JFIF header)
for marker in b"\xff\xc0", b"\xff\xda", b"\xff\xe0":
assert marker not in data[1]
assert marker in data[2]
with Image.open(BytesIO(data[0])) as interchange_im:
with Image.open(BytesIO(data[1] + data[2])) as combined_im:
assert_image_equal(interchange_im, combined_im)
def test_repr_jpeg(self) -> None:
im = hopper()
b = im._repr_jpeg_()
assert b is not None
with Image.open(BytesIO(b)) as repr_jpeg:
assert repr_jpeg.format == "JPEG"
assert_image_similar(im, repr_jpeg, 17)
def test_repr_jpeg_error_returns_none(self) -> None:
im = hopper("F")
assert im._repr_jpeg_() is None
def test_deprecation(self) -> None:
with Image.open(TEST_FILE) as im:
with pytest.warns(DeprecationWarning):
assert im.huffman_ac == {}
with pytest.warns(DeprecationWarning):
assert im.huffman_dc == {}
@pytest.mark.skipif(not is_win32(), reason="Windows only")
@skip_unless_feature("jpg")
class TestFileCloseW32:
def test_fd_leak(self, tmp_path: Path) -> None:
tmpfile = str(tmp_path / "temp.jpg")
with Image.open("Tests/images/hopper.jpg") as im:
im.save(tmpfile)
im = Image.open(tmpfile)
fp = im.fp
assert not fp.closed
with pytest.raises(OSError):
os.remove(tmpfile)
im.load()
assert fp.closed
# this should not fail, as load should have closed the file.
os.remove(tmpfile)
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