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Pillow/Tests/test_file_libtiff.py
Jon Dufresne 4cd4adddc3 Improve handling of file resources 
Follow Python's file object semantics. User code is responsible for
closing resources (usually through a context manager) in a deterministic
way.

To achieve this, remove __del__ functions. These functions used to
closed open file handlers in an attempt to silence Python
ResourceWarnings. However, using __del__ has the following drawbacks:

- __del__ isn't called until the object's reference count reaches 0.
  Therefore, resource handlers remain open or in use longer than
  necessary.

- The __del__ method isn't guaranteed to execute on system exit. See the
  Python documentation:

  https://docs.python.org/3/reference/datamodel.html#object.__del__

  > It is not guaranteed that __del__() methods are called for objects
  > that still exist when the interpreter exits.

- Exceptions that occur inside __del__ are ignored instead of raised.
  This has the potential of hiding bugs. This is also in the Python
  documentation:

  > Warning: Due to the precarious circumstances under which __del__()
  > methods are invoked, exceptions that occur during their execution
  > are ignored, and a warning is printed to sys.stderr instead.

Instead, always close resource handlers when they are no longer in use.
This will close the file handler at a specified point in the user's code
and not wait until the interpreter chooses to. It is always guaranteed
to run. And, if an exception occurs while closing the file handler, the
bug will not be ignored.

Now, when code receives a ResourceWarning, it will highlight an area
that is mishandling resources. It should not simply be silenced, but
fixed by closing resources with a context manager.

All warnings that were emitted during tests have been cleaned up. To
enable warnings, I passed the `-Wa` CLI option to Python. This exposed
some mishandling of resources in ImageFile.__init__() and
SpiderImagePlugin.loadImageSeries(), they too were fixed.
2019-10-12 08:27:17 -07:00

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from __future__ import print_function
import base64
import distutils.version
import io
import itertools
import logging
import os
from collections import namedtuple
from ctypes import c_float
from PIL import Image, TiffImagePlugin, TiffTags, features
from PIL._util import py3
from .helper import PillowTestCase, hopper
logger = logging.getLogger(__name__)
class LibTiffTestCase(PillowTestCase):
def setUp(self):
if not features.check("libtiff"):
self.skipTest("tiff support not available")
def _assert_noerr(self, im):
"""Helper tests that assert basic sanity about the g4 tiff reading"""
# 1 bit
self.assertEqual(im.mode, "1")
# Does the data actually load
im.load()
im.getdata()
try:
self.assertEqual(im._compression, "group4")
except AttributeError:
print("No _compression")
print(dir(im))
# can we write it back out, in a different form.
out = self.tempfile("temp.png")
im.save(out)
out_bytes = io.BytesIO()
im.save(out_bytes, format="tiff", compression="group4")
class TestFileLibTiff(LibTiffTestCase):
def test_g4_tiff(self):
"""Test the ordinary file path load path"""
test_file = "Tests/images/hopper_g4_500.tif"
im = Image.open(test_file)
self.assertEqual(im.size, (500, 500))
self._assert_noerr(im)
def test_g4_large(self):
test_file = "Tests/images/pport_g4.tif"
im = Image.open(test_file)
self._assert_noerr(im)
def test_g4_tiff_file(self):
"""Testing the string load path"""
test_file = "Tests/images/hopper_g4_500.tif"
with open(test_file, "rb") as f:
im = Image.open(f)
self.assertEqual(im.size, (500, 500))
self._assert_noerr(im)
def test_g4_tiff_bytesio(self):
"""Testing the stringio loading code path"""
test_file = "Tests/images/hopper_g4_500.tif"
s = io.BytesIO()
with open(test_file, "rb") as f:
s.write(f.read())
s.seek(0)
im = Image.open(s)
self.assertEqual(im.size, (500, 500))
self._assert_noerr(im)
def test_g4_non_disk_file_object(self):
"""Testing loading from non-disk non-BytesIO file object"""
test_file = "Tests/images/hopper_g4_500.tif"
s = io.BytesIO()
with open(test_file, "rb") as f:
s.write(f.read())
s.seek(0)
r = io.BufferedReader(s)
im = Image.open(r)
self.assertEqual(im.size, (500, 500))
self._assert_noerr(im)
def test_g4_eq_png(self):
""" Checking that we're actually getting the data that we expect"""
png = Image.open("Tests/images/hopper_bw_500.png")
g4 = Image.open("Tests/images/hopper_g4_500.tif")
self.assert_image_equal(g4, png)
# see https://github.com/python-pillow/Pillow/issues/279
def test_g4_fillorder_eq_png(self):
""" Checking that we're actually getting the data that we expect"""
png = Image.open("Tests/images/g4-fillorder-test.png")
g4 = Image.open("Tests/images/g4-fillorder-test.tif")
self.assert_image_equal(g4, png)
def test_g4_write(self):
"""Checking to see that the saved image is the same as what we wrote"""
test_file = "Tests/images/hopper_g4_500.tif"
orig = Image.open(test_file)
out = self.tempfile("temp.tif")
rot = orig.transpose(Image.ROTATE_90)
self.assertEqual(rot.size, (500, 500))
rot.save(out)
reread = Image.open(out)
self.assertEqual(reread.size, (500, 500))
self._assert_noerr(reread)
self.assert_image_equal(reread, rot)
self.assertEqual(reread.info["compression"], "group4")
self.assertEqual(reread.info["compression"], orig.info["compression"])
self.assertNotEqual(orig.tobytes(), reread.tobytes())
def test_adobe_deflate_tiff(self):
test_file = "Tests/images/tiff_adobe_deflate.tif"
im = Image.open(test_file)
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (278, 374))
self.assertEqual(im.tile[0][:3], ("libtiff", (0, 0, 278, 374), 0))
im.load()
self.assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")
def test_write_metadata(self):
""" Test metadata writing through libtiff """
for legacy_api in [False, True]:
f = self.tempfile("temp.tiff")
with Image.open("Tests/images/hopper_g4.tif") as img:
img.save(f, tiffinfo=img.tag)
if legacy_api:
original = img.tag.named()
else:
original = img.tag_v2.named()
# PhotometricInterpretation is set from SAVE_INFO,
# not the original image.
ignored = [
"StripByteCounts",
"RowsPerStrip",
"PageNumber",
"PhotometricInterpretation",
]
with Image.open(f) as loaded:
if legacy_api:
reloaded = loaded.tag.named()
else:
reloaded = loaded.tag_v2.named()
for tag, value in itertools.chain(reloaded.items(), original.items()):
if tag not in ignored:
val = original[tag]
if tag.endswith("Resolution"):
if legacy_api:
self.assertEqual(
c_float(val[0][0] / val[0][1]).value,
c_float(value[0][0] / value[0][1]).value,
msg="%s didn't roundtrip" % tag,
)
else:
self.assertEqual(
c_float(val).value,
c_float(value).value,
msg="%s didn't roundtrip" % tag,
)
else:
self.assertEqual(val, value, msg="%s didn't roundtrip" % tag)
# https://github.com/python-pillow/Pillow/issues/1561
requested_fields = ["StripByteCounts", "RowsPerStrip", "StripOffsets"]
for field in requested_fields:
self.assertIn(field, reloaded, "%s not in metadata" % field)
def test_additional_metadata(self):
# these should not crash. Seriously dummy data, most of it doesn't make
# any sense, so we're running up against limits where we're asking
# libtiff to do stupid things.
# Get the list of the ones that we should be able to write
core_items = {
tag: info
for tag, info in ((s, TiffTags.lookup(s)) for s in TiffTags.LIBTIFF_CORE)
if info.type is not None
}
# Exclude ones that have special meaning
# that we're already testing them
im = Image.open("Tests/images/hopper_g4.tif")
for tag in im.tag_v2:
try:
del core_items[tag]
except KeyError:
pass
# Type codes:
# 2: "ascii",
# 3: "short",
# 4: "long",
# 5: "rational",
# 12: "double",
# Type: dummy value
values = {
2: "test",
3: 1,
4: 2 ** 20,
5: TiffImagePlugin.IFDRational(100, 1),
12: 1.05,
}
new_ifd = TiffImagePlugin.ImageFileDirectory_v2()
for tag, info in core_items.items():
if info.length == 1:
new_ifd[tag] = values[info.type]
if info.length == 0:
new_ifd[tag] = tuple(values[info.type] for _ in range(3))
else:
new_ifd[tag] = tuple(values[info.type] for _ in range(info.length))
# Extra samples really doesn't make sense in this application.
del new_ifd[338]
out = self.tempfile("temp.tif")
TiffImagePlugin.WRITE_LIBTIFF = True
im.save(out, tiffinfo=new_ifd)
TiffImagePlugin.WRITE_LIBTIFF = False
def test_custom_metadata(self):
tc = namedtuple("test_case", "value,type,supported_by_default")
custom = {
37000 + k: v
for k, v in enumerate(
[
tc(4, TiffTags.SHORT, True),
tc(123456789, TiffTags.LONG, True),
tc(-4, TiffTags.SIGNED_BYTE, False),
tc(-4, TiffTags.SIGNED_SHORT, False),
tc(-123456789, TiffTags.SIGNED_LONG, False),
tc(TiffImagePlugin.IFDRational(4, 7), TiffTags.RATIONAL, True),
tc(4.25, TiffTags.FLOAT, True),
tc(4.25, TiffTags.DOUBLE, True),
tc("custom tag value", TiffTags.ASCII, True),
tc(u"custom tag value", TiffTags.ASCII, True),
tc(b"custom tag value", TiffTags.BYTE, True),
tc((4, 5, 6), TiffTags.SHORT, True),
tc((123456789, 9, 34, 234, 219387, 92432323), TiffTags.LONG, True),
tc((-4, 9, 10), TiffTags.SIGNED_BYTE, False),
tc((-4, 5, 6), TiffTags.SIGNED_SHORT, False),
tc(
(-123456789, 9, 34, 234, 219387, -92432323),
TiffTags.SIGNED_LONG,
False,
),
tc((4.25, 5.25), TiffTags.FLOAT, True),
tc((4.25, 5.25), TiffTags.DOUBLE, True),
# array of TIFF_BYTE requires bytes instead of tuple for backwards
# compatibility
tc(bytes([4]), TiffTags.BYTE, True),
tc(bytes((4, 9, 10)), TiffTags.BYTE, True),
]
)
}
libtiff_version = TiffImagePlugin._libtiff_version()
libtiffs = [False]
if distutils.version.StrictVersion(
libtiff_version
) >= distutils.version.StrictVersion("4.0"):
libtiffs.append(True)
for libtiff in libtiffs:
TiffImagePlugin.WRITE_LIBTIFF = libtiff
def check_tags(tiffinfo):
im = hopper()
out = self.tempfile("temp.tif")
im.save(out, tiffinfo=tiffinfo)
with Image.open(out) as reloaded:
for tag, value in tiffinfo.items():
reloaded_value = reloaded.tag_v2[tag]
if (
isinstance(reloaded_value, TiffImagePlugin.IFDRational)
and libtiff
):
# libtiff does not support real RATIONALS
self.assertAlmostEqual(float(reloaded_value), float(value))
continue
if libtiff and isinstance(value, bytes):
value = value.decode()
self.assertEqual(reloaded_value, value)
# Test with types
ifd = TiffImagePlugin.ImageFileDirectory_v2()
for tag, tagdata in custom.items():
ifd[tag] = tagdata.value
ifd.tagtype[tag] = tagdata.type
check_tags(ifd)
# Test without types. This only works for some types, int for example are
# always encoded as LONG and not SIGNED_LONG.
check_tags(
{
tag: tagdata.value
for tag, tagdata in custom.items()
if tagdata.supported_by_default
}
)
TiffImagePlugin.WRITE_LIBTIFF = False
def test_int_dpi(self):
# issue #1765
im = hopper("RGB")
out = self.tempfile("temp.tif")
TiffImagePlugin.WRITE_LIBTIFF = True
im.save(out, dpi=(72, 72))
TiffImagePlugin.WRITE_LIBTIFF = False
with Image.open(out) as reloaded:
self.assertEqual(reloaded.info["dpi"], (72.0, 72.0))
def test_g3_compression(self):
i = Image.open("Tests/images/hopper_g4_500.tif")
out = self.tempfile("temp.tif")
i.save(out, compression="group3")
reread = Image.open(out)
self.assertEqual(reread.info["compression"], "group3")
self.assert_image_equal(reread, i)
def test_little_endian(self):
im = Image.open("Tests/images/16bit.deflate.tif")
self.assertEqual(im.getpixel((0, 0)), 480)
self.assertEqual(im.mode, "I;16")
b = im.tobytes()
# Bytes are in image native order (little endian)
if py3:
self.assertEqual(b[0], ord(b"\xe0"))
self.assertEqual(b[1], ord(b"\x01"))
else:
self.assertEqual(b[0], b"\xe0")
self.assertEqual(b[1], b"\x01")
out = self.tempfile("temp.tif")
# out = "temp.le.tif"
im.save(out)
reread = Image.open(out)
self.assertEqual(reread.info["compression"], im.info["compression"])
self.assertEqual(reread.getpixel((0, 0)), 480)
# UNDONE - libtiff defaults to writing in native endian, so
# on big endian, we'll get back mode = 'I;16B' here.
def test_big_endian(self):
im = Image.open("Tests/images/16bit.MM.deflate.tif")
self.assertEqual(im.getpixel((0, 0)), 480)
self.assertEqual(im.mode, "I;16B")
b = im.tobytes()
# Bytes are in image native order (big endian)
if py3:
self.assertEqual(b[0], ord(b"\x01"))
self.assertEqual(b[1], ord(b"\xe0"))
else:
self.assertEqual(b[0], b"\x01")
self.assertEqual(b[1], b"\xe0")
out = self.tempfile("temp.tif")
im.save(out)
reread = Image.open(out)
self.assertEqual(reread.info["compression"], im.info["compression"])
self.assertEqual(reread.getpixel((0, 0)), 480)
def test_g4_string_info(self):
"""Tests String data in info directory"""
test_file = "Tests/images/hopper_g4_500.tif"
orig = Image.open(test_file)
out = self.tempfile("temp.tif")
orig.tag[269] = "temp.tif"
orig.save(out)
with Image.open(out) as reread:
self.assertEqual("temp.tif", reread.tag_v2[269])
self.assertEqual("temp.tif", reread.tag[269][0])
def test_12bit_rawmode(self):
""" Are we generating the same interpretation
of the image as Imagemagick is? """
TiffImagePlugin.READ_LIBTIFF = True
im = Image.open("Tests/images/12bit.cropped.tif")
im.load()
TiffImagePlugin.READ_LIBTIFF = False
# to make the target --
# convert 12bit.cropped.tif -depth 16 tmp.tif
# convert tmp.tif -evaluate RightShift 4 12in16bit2.tif
# imagemagick will auto scale so that a 12bit FFF is 16bit FFF0,
# so we need to unshift so that the integer values are the same.
self.assert_image_equal_tofile(im, "Tests/images/12in16bit.tif")
def test_blur(self):
# test case from irc, how to do blur on b/w image
# and save to compressed tif.
from PIL import ImageFilter
out = self.tempfile("temp.tif")
im = Image.open("Tests/images/pport_g4.tif")
im = im.convert("L")
im = im.filter(ImageFilter.GaussianBlur(4))
im.save(out, compression="tiff_adobe_deflate")
im2 = Image.open(out)
im2.load()
self.assert_image_equal(im, im2)
def test_compressions(self):
# Test various tiff compressions and assert similar image content but reduced
# file sizes.
im = hopper("RGB")
out = self.tempfile("temp.tif")
im.save(out)
size_raw = os.path.getsize(out)
for compression in ("packbits", "tiff_lzw"):
im.save(out, compression=compression)
size_compressed = os.path.getsize(out)
im2 = Image.open(out)
self.assert_image_equal(im, im2)
im.save(out, compression="jpeg")
size_jpeg = os.path.getsize(out)
im2 = Image.open(out)
self.assert_image_similar(im, im2, 30)
im.save(out, compression="jpeg", quality=30)
size_jpeg_30 = os.path.getsize(out)
im3 = Image.open(out)
self.assert_image_similar(im2, im3, 30)
self.assertGreater(size_raw, size_compressed)
self.assertGreater(size_compressed, size_jpeg)
self.assertGreater(size_jpeg, size_jpeg_30)
def test_quality(self):
im = hopper("RGB")
out = self.tempfile("temp.tif")
self.assertRaises(ValueError, im.save, out, compression="tiff_lzw", quality=50)
self.assertRaises(ValueError, im.save, out, compression="jpeg", quality=-1)
self.assertRaises(ValueError, im.save, out, compression="jpeg", quality=101)
self.assertRaises(ValueError, im.save, out, compression="jpeg", quality="good")
im.save(out, compression="jpeg", quality=0)
im.save(out, compression="jpeg", quality=100)
def test_cmyk_save(self):
im = hopper("CMYK")
out = self.tempfile("temp.tif")
im.save(out, compression="tiff_adobe_deflate")
im2 = Image.open(out)
self.assert_image_equal(im, im2)
def xtest_bw_compression_w_rgb(self):
""" This test passes, but when running all tests causes a failure due
to output on stderr from the error thrown by libtiff. We need to
capture that but not now"""
im = hopper("RGB")
out = self.tempfile("temp.tif")
self.assertRaises(IOError, im.save, out, compression="tiff_ccitt")
self.assertRaises(IOError, im.save, out, compression="group3")
self.assertRaises(IOError, im.save, out, compression="group4")
def test_fp_leak(self):
im = Image.open("Tests/images/hopper_g4_500.tif")
fn = im.fp.fileno()
os.fstat(fn)
im.load() # this should close it.
self.assertRaises(OSError, os.fstat, fn)
im = None # this should force even more closed.
self.assertRaises(OSError, os.fstat, fn)
self.assertRaises(OSError, os.close, fn)
def test_multipage(self):
# issue #862
TiffImagePlugin.READ_LIBTIFF = True
with Image.open("Tests/images/multipage.tiff") as im:
# file is a multipage tiff, 10x10 green, 10x10 red, 20x20 blue
im.seek(0)
self.assertEqual(im.size, (10, 10))
self.assertEqual(im.convert("RGB").getpixel((0, 0)), (0, 128, 0))
self.assertTrue(im.tag.next)
im.seek(1)
self.assertEqual(im.size, (10, 10))
self.assertEqual(im.convert("RGB").getpixel((0, 0)), (255, 0, 0))
self.assertTrue(im.tag.next)
im.seek(2)
self.assertFalse(im.tag.next)
self.assertEqual(im.size, (20, 20))
self.assertEqual(im.convert("RGB").getpixel((0, 0)), (0, 0, 255))
TiffImagePlugin.READ_LIBTIFF = False
def test_multipage_nframes(self):
# issue #862
TiffImagePlugin.READ_LIBTIFF = True
with Image.open("Tests/images/multipage.tiff") as im:
frames = im.n_frames
self.assertEqual(frames, 3)
for _ in range(frames):
im.seek(0)
# Should not raise ValueError: I/O operation on closed file
im.load()
TiffImagePlugin.READ_LIBTIFF = False
def test__next(self):
TiffImagePlugin.READ_LIBTIFF = True
im = Image.open("Tests/images/hopper.tif")
self.assertFalse(im.tag.next)
im.load()
self.assertFalse(im.tag.next)
def test_4bit(self):
# Arrange
test_file = "Tests/images/hopper_gray_4bpp.tif"
original = hopper("L")
# Act
TiffImagePlugin.READ_LIBTIFF = True
im = Image.open(test_file)
TiffImagePlugin.READ_LIBTIFF = False
# Assert
self.assertEqual(im.size, (128, 128))
self.assertEqual(im.mode, "L")
self.assert_image_similar(im, original, 7.3)
def test_gray_semibyte_per_pixel(self):
test_files = (
(
24.8, # epsilon
( # group
"Tests/images/tiff_gray_2_4_bpp/hopper2.tif",
"Tests/images/tiff_gray_2_4_bpp/hopper2I.tif",
"Tests/images/tiff_gray_2_4_bpp/hopper2R.tif",
"Tests/images/tiff_gray_2_4_bpp/hopper2IR.tif",
),
),
(
7.3, # epsilon
( # group
"Tests/images/tiff_gray_2_4_bpp/hopper4.tif",
"Tests/images/tiff_gray_2_4_bpp/hopper4I.tif",
"Tests/images/tiff_gray_2_4_bpp/hopper4R.tif",
"Tests/images/tiff_gray_2_4_bpp/hopper4IR.tif",
),
),
)
original = hopper("L")
for epsilon, group in test_files:
im = Image.open(group[0])
self.assertEqual(im.size, (128, 128))
self.assertEqual(im.mode, "L")
self.assert_image_similar(im, original, epsilon)
for file in group[1:]:
im2 = Image.open(file)
self.assertEqual(im2.size, (128, 128))
self.assertEqual(im2.mode, "L")
self.assert_image_equal(im, im2)
def test_save_bytesio(self):
# PR 1011
# Test TIFF saving to io.BytesIO() object.
TiffImagePlugin.WRITE_LIBTIFF = True
TiffImagePlugin.READ_LIBTIFF = True
# Generate test image
pilim = hopper()
def save_bytesio(compression=None):
buffer_io = io.BytesIO()
pilim.save(buffer_io, format="tiff", compression=compression)
buffer_io.seek(0)
pilim_load = Image.open(buffer_io)
self.assert_image_similar(pilim, pilim_load, 0)
save_bytesio()
save_bytesio("raw")
save_bytesio("packbits")
save_bytesio("tiff_lzw")
TiffImagePlugin.WRITE_LIBTIFF = False
TiffImagePlugin.READ_LIBTIFF = False
def test_crashing_metadata(self):
# issue 1597
im = Image.open("Tests/images/rdf.tif")
out = self.tempfile("temp.tif")
TiffImagePlugin.WRITE_LIBTIFF = True
# this shouldn't crash
im.save(out, format="TIFF")
TiffImagePlugin.WRITE_LIBTIFF = False
def test_page_number_x_0(self):
# Issue 973
# Test TIFF with tag 297 (Page Number) having value of 0 0.
# The first number is the current page number.
# The second is the total number of pages, zero means not available.
outfile = self.tempfile("temp.tif")
# Created by printing a page in Chrome to PDF, then:
# /usr/bin/gs -q -sDEVICE=tiffg3 -sOutputFile=total-pages-zero.tif
# -dNOPAUSE /tmp/test.pdf -c quit
infile = "Tests/images/total-pages-zero.tif"
with Image.open(infile) as im:
# Should not divide by zero
im.save(outfile)
def test_fd_duplication(self):
# https://github.com/python-pillow/Pillow/issues/1651
tmpfile = self.tempfile("temp.tif")
with open(tmpfile, "wb") as f:
with open("Tests/images/g4-multi.tiff", "rb") as src:
f.write(src.read())
im = Image.open(tmpfile)
im.n_frames
im.close()
# Should not raise PermissionError.
os.remove(tmpfile)
def test_read_icc(self):
with Image.open("Tests/images/hopper.iccprofile.tif") as img:
icc = img.info.get("icc_profile")
self.assertIsNotNone(icc)
TiffImagePlugin.READ_LIBTIFF = True
with Image.open("Tests/images/hopper.iccprofile.tif") as img:
icc_libtiff = img.info.get("icc_profile")
self.assertIsNotNone(icc_libtiff)
TiffImagePlugin.READ_LIBTIFF = False
self.assertEqual(icc, icc_libtiff)
def test_multipage_compression(self):
with Image.open("Tests/images/compression.tif") as im:
im.seek(0)
self.assertEqual(im._compression, "tiff_ccitt")
self.assertEqual(im.size, (10, 10))
im.seek(1)
self.assertEqual(im._compression, "packbits")
self.assertEqual(im.size, (10, 10))
im.load()
im.seek(0)
self.assertEqual(im._compression, "tiff_ccitt")
self.assertEqual(im.size, (10, 10))
im.load()
def test_save_tiff_with_jpegtables(self):
# Arrange
outfile = self.tempfile("temp.tif")
# Created with ImageMagick: convert hopper.jpg hopper_jpg.tif
# Contains JPEGTables (347) tag
infile = "Tests/images/hopper_jpg.tif"
im = Image.open(infile)
# Act / Assert
# Should not raise UnicodeDecodeError or anything else
im.save(outfile)
def test_16bit_RGB_tiff(self):
im = Image.open("Tests/images/tiff_16bit_RGB.tiff")
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (100, 40))
self.assertEqual(
im.tile,
[
(
"libtiff",
(0, 0, 100, 40),
0,
("RGB;16N", "tiff_adobe_deflate", False, 8),
)
],
)
im.load()
self.assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGB_target.png")
def test_16bit_RGBa_tiff(self):
im = Image.open("Tests/images/tiff_16bit_RGBa.tiff")
self.assertEqual(im.mode, "RGBA")
self.assertEqual(im.size, (100, 40))
self.assertEqual(
im.tile,
[("libtiff", (0, 0, 100, 40), 0, ("RGBa;16N", "tiff_lzw", False, 38236))],
)
im.load()
self.assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGBa_target.png")
def test_gimp_tiff(self):
# Read TIFF JPEG images from GIMP [@PIL168]
codecs = dir(Image.core)
if "jpeg_decoder" not in codecs:
self.skipTest("jpeg support not available")
filename = "Tests/images/pil168.tif"
im = Image.open(filename)
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (256, 256))
self.assertEqual(
im.tile, [("libtiff", (0, 0, 256, 256), 0, ("RGB", "jpeg", False, 5122))]
)
im.load()
self.assert_image_equal_tofile(im, "Tests/images/pil168.png")
def test_sampleformat(self):
# https://github.com/python-pillow/Pillow/issues/1466
im = Image.open("Tests/images/copyleft.tiff")
self.assertEqual(im.mode, "RGB")
self.assert_image_equal_tofile(im, "Tests/images/copyleft.png", mode="RGB")
def test_lzw(self):
im = Image.open("Tests/images/hopper_lzw.tif")
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (128, 128))
self.assertEqual(im.format, "TIFF")
im2 = hopper()
self.assert_image_similar(im, im2, 5)
def test_strip_cmyk_jpeg(self):
infile = "Tests/images/tiff_strip_cmyk_jpeg.tif"
im = Image.open(infile)
self.assert_image_similar_tofile(im, "Tests/images/pil_sample_cmyk.jpg", 0.5)
def test_strip_cmyk_16l_jpeg(self):
infile = "Tests/images/tiff_strip_cmyk_16l_jpeg.tif"
im = Image.open(infile)
self.assert_image_similar_tofile(im, "Tests/images/pil_sample_cmyk.jpg", 0.5)
def test_strip_ycbcr_jpeg_2x2_sampling(self):
infile = "Tests/images/tiff_strip_ycbcr_jpeg_2x2_sampling.tif"
im = Image.open(infile)
self.assert_image_similar_tofile(im, "Tests/images/flower.jpg", 0.5)
def test_strip_ycbcr_jpeg_1x1_sampling(self):
infile = "Tests/images/tiff_strip_ycbcr_jpeg_1x1_sampling.tif"
im = Image.open(infile)
self.assert_image_equal_tofile(im, "Tests/images/flower2.jpg")
def test_tiled_cmyk_jpeg(self):
infile = "Tests/images/tiff_tiled_cmyk_jpeg.tif"
im = Image.open(infile)
self.assert_image_similar_tofile(im, "Tests/images/pil_sample_cmyk.jpg", 0.5)
def test_tiled_ycbcr_jpeg_1x1_sampling(self):
infile = "Tests/images/tiff_tiled_ycbcr_jpeg_1x1_sampling.tif"
im = Image.open(infile)
self.assert_image_equal_tofile(im, "Tests/images/flower2.jpg")
def test_tiled_ycbcr_jpeg_2x2_sampling(self):
infile = "Tests/images/tiff_tiled_ycbcr_jpeg_2x2_sampling.tif"
im = Image.open(infile)
self.assert_image_similar_tofile(im, "Tests/images/flower.jpg", 0.5)
def test_old_style_jpeg(self):
infile = "Tests/images/old-style-jpeg-compression.tif"
im = Image.open(infile)
self.assert_image_equal_tofile(
im, "Tests/images/old-style-jpeg-compression.png"
)
def test_no_rows_per_strip(self):
# This image does not have a RowsPerStrip TIFF tag
infile = "Tests/images/no_rows_per_strip.tif"
with Image.open(infile) as im:
im.load()
self.assertEqual(im.size, (950, 975))
def test_orientation(self):
base_im = Image.open("Tests/images/g4_orientation_1.tif")
for i in range(2, 9):
im = Image.open("Tests/images/g4_orientation_" + str(i) + ".tif")
im.load()
self.assert_image_similar(base_im, im, 0.7)
def test_sampleformat_not_corrupted(self):
# Assert that a TIFF image with SampleFormat=UINT tag is not corrupted
# when saving to a new file.
# Pillow 6.0 fails with "OSError: cannot identify image file".
tiff = io.BytesIO(
base64.b64decode(
b"SUkqAAgAAAAPAP4ABAABAAAAAAAAAAABBAABAAAAAQAAAAEBBAABAAAAAQAA"
b"AAIBAwADAAAAwgAAAAMBAwABAAAACAAAAAYBAwABAAAAAgAAABEBBAABAAAA"
b"4AAAABUBAwABAAAAAwAAABYBBAABAAAAAQAAABcBBAABAAAACwAAABoBBQAB"
b"AAAAyAAAABsBBQABAAAA0AAAABwBAwABAAAAAQAAACgBAwABAAAAAQAAAFMB"
b"AwADAAAA2AAAAAAAAAAIAAgACAABAAAAAQAAAAEAAAABAAAAAQABAAEAAAB4"
b"nGNgYAAAAAMAAQ=="
)
)
out = io.BytesIO()
with Image.open(tiff) as im:
im.save(out, format="tiff")
out.seek(0)
with Image.open(out) as im:
im.load()
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