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test_file_tiff_metadata.py
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test_file_tiff_metadata.py
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import io
import struct
import pytest
from PIL import Image, TiffImagePlugin, TiffTags
from PIL.TiffImagePlugin import IFDRational
from .helper import assert_deep_equal, hopper
TAG_IDS = {info.name: info.value for info in TiffTags.TAGS_V2.values()}
def test_rt_metadata(tmp_path):
"""Test writing arbitrary metadata into the tiff image directory
Use case is ImageJ private tags, one numeric, one arbitrary
data. https://github.com/python-pillow/Pillow/issues/291
"""
img = hopper()
# Behaviour change: re #1416
# Pre ifd rewrite, ImageJMetaData was being written as a string(2),
# Post ifd rewrite, it's defined as arbitrary bytes(7). It should
# roundtrip with the actual bytes, rather than stripped text
# of the premerge tests.
#
# For text items, we still have to decode('ascii','replace') because
# the tiff file format can't take 8 bit bytes in that field.
base_text_data = "This is some arbitrary metadata for a text field"
bin_data = base_text_data.encode("ascii") + b" \xff"
text_data = base_text_data + " " + chr(255)
reloaded_text_data = base_text_data + " ?"
float_data = 12.345
double_data = 67.89
info = TiffImagePlugin.ImageFileDirectory()
ImageJMetaData = TAG_IDS["ImageJMetaData"]
ImageJMetaDataByteCounts = TAG_IDS["ImageJMetaDataByteCounts"]
ImageDescription = TAG_IDS["ImageDescription"]
info[ImageJMetaDataByteCounts] = len(bin_data)
info[ImageJMetaData] = bin_data
info[TAG_IDS["RollAngle"]] = float_data
info.tagtype[TAG_IDS["RollAngle"]] = 11
info[TAG_IDS["YawAngle"]] = double_data
info.tagtype[TAG_IDS["YawAngle"]] = 12
info[ImageDescription] = text_data
f = str(tmp_path / "temp.tif")
img.save(f, tiffinfo=info)
with Image.open(f) as loaded:
assert loaded.tag[ImageJMetaDataByteCounts] == (len(bin_data),)
assert loaded.tag_v2[ImageJMetaDataByteCounts] == (len(bin_data),)
assert loaded.tag[ImageJMetaData] == bin_data
assert loaded.tag_v2[ImageJMetaData] == bin_data
assert loaded.tag[ImageDescription] == (reloaded_text_data,)
assert loaded.tag_v2[ImageDescription] == reloaded_text_data
loaded_float = loaded.tag[TAG_IDS["RollAngle"]][0]
assert round(abs(loaded_float - float_data), 5) == 0
loaded_double = loaded.tag[TAG_IDS["YawAngle"]][0]
assert round(abs(loaded_double - double_data), 7) == 0
# check with 2 element ImageJMetaDataByteCounts, issue #2006
info[ImageJMetaDataByteCounts] = (8, len(bin_data) - 8)
img.save(f, tiffinfo=info)
with Image.open(f) as loaded:
assert loaded.tag[ImageJMetaDataByteCounts] == (8, len(bin_data) - 8)
assert loaded.tag_v2[ImageJMetaDataByteCounts] == (8, len(bin_data) - 8)
def test_read_metadata():
with Image.open("Tests/images/hopper_g4.tif") as img:
assert {
"YResolution": IFDRational(4294967295, 113653537),
"PlanarConfiguration": 1,
"BitsPerSample": (1,),
"ImageLength": 128,
"Compression": 4,
"FillOrder": 1,
"RowsPerStrip": 128,
"ResolutionUnit": 3,
"PhotometricInterpretation": 0,
"PageNumber": (0, 1),
"XResolution": IFDRational(4294967295, 113653537),
"ImageWidth": 128,
"Orientation": 1,
"StripByteCounts": (1968,),
"SamplesPerPixel": 1,
"StripOffsets": (8,),
} == img.tag_v2.named()
assert {
"YResolution": ((4294967295, 113653537),),
"PlanarConfiguration": (1,),
"BitsPerSample": (1,),
"ImageLength": (128,),
"Compression": (4,),
"FillOrder": (1,),
"RowsPerStrip": (128,),
"ResolutionUnit": (3,),
"PhotometricInterpretation": (0,),
"PageNumber": (0, 1),
"XResolution": ((4294967295, 113653537),),
"ImageWidth": (128,),
"Orientation": (1,),
"StripByteCounts": (1968,),
"SamplesPerPixel": (1,),
"StripOffsets": (8,),
} == img.tag.named()
def test_write_metadata(tmp_path):
"""Test metadata writing through the python code"""
with Image.open("Tests/images/hopper.tif") as img:
f = str(tmp_path / "temp.tiff")
img.save(f, tiffinfo=img.tag)
original = img.tag_v2.named()
with Image.open(f) as loaded:
reloaded = loaded.tag_v2.named()
ignored = ["StripByteCounts", "RowsPerStrip", "PageNumber", "StripOffsets"]
for tag, value in reloaded.items():
if tag in ignored:
continue
if isinstance(original[tag], tuple) and isinstance(
original[tag][0], IFDRational
):
# Need to compare element by element in the tuple,
# not comparing tuples of object references
assert_deep_equal(
original[tag],
value,
f"{tag} didn't roundtrip, {original[tag]}, {value}",
)
else:
assert (
original[tag] == value
), f"{tag} didn't roundtrip, {original[tag]}, {value}"
for tag, value in original.items():
if tag not in ignored:
assert value == reloaded[tag], f"{tag} didn't roundtrip"
def test_change_stripbytecounts_tag_type(tmp_path):
out = str(tmp_path / "temp.tiff")
with Image.open("Tests/images/hopper.tif") as im:
info = im.tag_v2
# Resize the image so that STRIPBYTECOUNTS will be larger than a SHORT
im = im.resize((500, 500))
# STRIPBYTECOUNTS can be a SHORT or a LONG
info.tagtype[TiffImagePlugin.STRIPBYTECOUNTS] = TiffTags.SHORT
im.save(out, tiffinfo=info)
with Image.open(out) as reloaded:
assert reloaded.tag_v2.tagtype[TiffImagePlugin.STRIPBYTECOUNTS] == TiffTags.LONG
def test_no_duplicate_50741_tag():
assert TAG_IDS["MakerNoteSafety"] == 50741
assert TAG_IDS["BestQualityScale"] == 50780
def test_iptc(tmp_path):
out = str(tmp_path / "temp.tiff")
with Image.open("Tests/images/hopper.Lab.tif") as im:
im.save(out)
def test_writing_bytes_to_ascii(tmp_path):
im = hopper()
info = TiffImagePlugin.ImageFileDirectory_v2()
tag = TiffTags.TAGS_V2[271]
assert tag.type == TiffTags.ASCII
info[271] = b"test"
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info)
with Image.open(out) as reloaded:
assert reloaded.tag_v2[271] == "test"
def test_undefined_zero(tmp_path):
# Check that the tag has not been changed since this test was created
tag = TiffTags.TAGS_V2[45059]
assert tag.type == TiffTags.UNDEFINED
assert tag.length == 0
info = TiffImagePlugin.ImageFileDirectory(b"II*\x00\x08\x00\x00\x00")
info[45059] = b"test"
# Assert that the tag value does not change by setting it to itself
original = info[45059]
info[45059] = info[45059]
assert info[45059] == original
def test_empty_metadata():
f = io.BytesIO(b"II*\x00\x08\x00\x00\x00")
head = f.read(8)
info = TiffImagePlugin.ImageFileDirectory(head)
# Should not raise struct.error.
pytest.warns(UserWarning, info.load, f)
def test_iccprofile(tmp_path):
# https://github.com/python-pillow/Pillow/issues/1462
out = str(tmp_path / "temp.tiff")
with Image.open("Tests/images/hopper.iccprofile.tif") as im:
im.save(out)
with Image.open(out) as reloaded:
assert not isinstance(im.info["icc_profile"], tuple)
assert im.info["icc_profile"] == reloaded.info["icc_profile"]
def test_iccprofile_binary():
# https://github.com/python-pillow/Pillow/issues/1526
# We should be able to load this,
# but probably won't be able to save it.
with Image.open("Tests/images/hopper.iccprofile_binary.tif") as im:
assert im.tag_v2.tagtype[34675] == 1
assert im.info["icc_profile"]
def test_iccprofile_save_png(tmp_path):
with Image.open("Tests/images/hopper.iccprofile.tif") as im:
outfile = str(tmp_path / "temp.png")
im.save(outfile)
def test_iccprofile_binary_save_png(tmp_path):
with Image.open("Tests/images/hopper.iccprofile_binary.tif") as im:
outfile = str(tmp_path / "temp.png")
im.save(outfile)
def test_exif_div_zero(tmp_path):
im = hopper()
info = TiffImagePlugin.ImageFileDirectory_v2()
info[41988] = TiffImagePlugin.IFDRational(0, 0)
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert 0 == reloaded.tag_v2[41988].numerator
assert 0 == reloaded.tag_v2[41988].denominator
def test_ifd_unsigned_rational(tmp_path):
im = hopper()
info = TiffImagePlugin.ImageFileDirectory_v2()
max_long = 2**32 - 1
# 4 bytes unsigned long
numerator = max_long
info[41493] = TiffImagePlugin.IFDRational(numerator, 1)
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert max_long == reloaded.tag_v2[41493].numerator
assert 1 == reloaded.tag_v2[41493].denominator
# out of bounds of 4 byte unsigned long
numerator = max_long + 1
info[41493] = TiffImagePlugin.IFDRational(numerator, 1)
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert max_long == reloaded.tag_v2[41493].numerator
assert 1 == reloaded.tag_v2[41493].denominator
def test_ifd_signed_rational(tmp_path):
im = hopper()
info = TiffImagePlugin.ImageFileDirectory_v2()
# pair of 4 byte signed longs
numerator = 2**31 - 1
denominator = -(2**31)
info[37380] = TiffImagePlugin.IFDRational(numerator, denominator)
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert numerator == reloaded.tag_v2[37380].numerator
assert denominator == reloaded.tag_v2[37380].denominator
numerator = -(2**31)
denominator = 2**31 - 1
info[37380] = TiffImagePlugin.IFDRational(numerator, denominator)
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert numerator == reloaded.tag_v2[37380].numerator
assert denominator == reloaded.tag_v2[37380].denominator
# out of bounds of 4 byte signed long
numerator = -(2**31) - 1
denominator = 1
info[37380] = TiffImagePlugin.IFDRational(numerator, denominator)
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert 2**31 - 1 == reloaded.tag_v2[37380].numerator
assert -1 == reloaded.tag_v2[37380].denominator
def test_ifd_signed_long(tmp_path):
im = hopper()
info = TiffImagePlugin.ImageFileDirectory_v2()
info[37000] = -60000
out = str(tmp_path / "temp.tiff")
im.save(out, tiffinfo=info, compression="raw")
with Image.open(out) as reloaded:
assert reloaded.tag_v2[37000] == -60000
def test_empty_values():
data = io.BytesIO(
b"II*\x00\x08\x00\x00\x00\x03\x00\x1a\x01\x05\x00\x00\x00\x00\x00"
b"\x00\x00\x00\x00\x1b\x01\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00"
b"\x98\x82\x02\x00\x07\x00\x00\x002\x00\x00\x00\x00\x00\x00\x00a "
b"text\x00\x00"
)
head = data.read(8)
info = TiffImagePlugin.ImageFileDirectory_v2(head)
info.load(data)
# Should not raise ValueError.
info = dict(info)
assert 33432 in info
def test_photoshop_info(tmp_path):
with Image.open("Tests/images/issue_2278.tif") as im:
assert len(im.tag_v2[34377]) == 70
assert isinstance(im.tag_v2[34377], bytes)
out = str(tmp_path / "temp.tiff")
im.save(out)
with Image.open(out) as reloaded:
assert len(reloaded.tag_v2[34377]) == 70
assert isinstance(reloaded.tag_v2[34377], bytes)
def test_too_many_entries():
ifd = TiffImagePlugin.ImageFileDirectory_v2()
# 277: ("SamplesPerPixel", SHORT, 1),
ifd._tagdata[277] = struct.pack("hh", 4, 4)
ifd.tagtype[277] = TiffTags.SHORT
# Should not raise ValueError.
pytest.warns(UserWarning, lambda: ifd[277])
def test_tag_group_data():
base_ifd = TiffImagePlugin.ImageFileDirectory_v2()
interop_ifd = TiffImagePlugin.ImageFileDirectory_v2(group=40965)
for ifd in (base_ifd, interop_ifd):
ifd[2] = "test"
ifd[256] = 10
assert base_ifd.tagtype[256] == 4
assert interop_ifd.tagtype[256] != base_ifd.tagtype[256]
assert interop_ifd.tagtype[2] == 7
assert base_ifd.tagtype[2] != interop_ifd.tagtype[256]
def test_empty_subifd(tmp_path):
out = str(tmp_path / "temp.jpg")
im = hopper()
exif = im.getexif()
exif[TiffImagePlugin.EXIFIFD] = {}
im.save(out, exif=exif)
with Image.open(out) as reloaded:
exif = reloaded.getexif()
assert exif.get_ifd(TiffImagePlugin.EXIFIFD) == {}