Pillow/Tests/test_file_libtiff.py

import base64
import io
import itertools
import logging
import os
from collections import namedtuple
from ctypes import c_float

import pytest
from PIL import Image, ImageFilter, TiffImagePlugin, TiffTags

from .helper import (
    assert_image_equal,
    assert_image_equal_tofile,
    assert_image_similar,
    assert_image_similar_tofile,
    hopper,
    skip_unless_feature,
)

logger = logging.getLogger(__name__)


@skip_unless_feature("libtiff")
class LibTiffTestCase:
    def _assert_noerr(self, tmp_path, im):
        """Helper tests that assert basic sanity about the g4 tiff reading"""
        # 1 bit
        assert im.mode == "1"

        # Does the data actually load
        im.load()
        im.getdata()

        try:
            assert im._compression == "group4"
        except AttributeError:
            print("No _compression")
            print(dir(im))

        # can we write it back out, in a different form.
        out = str(tmp_path / "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, tmp_path):
        """Test the ordinary file path load path"""

        test_file = "Tests/images/hopper_g4_500.tif"
        with Image.open(test_file) as im:
            assert im.size == (500, 500)
            self._assert_noerr(tmp_path, im)

    def test_g4_large(self, tmp_path):
        test_file = "Tests/images/pport_g4.tif"
        with Image.open(test_file) as im:
            self._assert_noerr(tmp_path, im)

    def test_g4_tiff_file(self, tmp_path):
        """Testing the string load path"""

        test_file = "Tests/images/hopper_g4_500.tif"
        with open(test_file, "rb") as f:
            with Image.open(f) as im:
                assert im.size == (500, 500)
                self._assert_noerr(tmp_path, im)

    def test_g4_tiff_bytesio(self, tmp_path):
        """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)
        with Image.open(s) as im:
            assert im.size == (500, 500)
            self._assert_noerr(tmp_path, im)

    def test_g4_non_disk_file_object(self, tmp_path):
        """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)
        with Image.open(r) as im:
            assert im.size == (500, 500)
            self._assert_noerr(tmp_path, im)

    def test_g4_eq_png(self):
        """ Checking that we're actually getting the data that we expect"""
        with Image.open("Tests/images/hopper_bw_500.png") as png:
            with Image.open("Tests/images/hopper_g4_500.tif") as g4:
                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"""
        with Image.open("Tests/images/g4-fillorder-test.png") as png:
            with Image.open("Tests/images/g4-fillorder-test.tif") as g4:
                assert_image_equal(g4, png)

    def test_g4_write(self, tmp_path):
        """Checking to see that the saved image is the same as what we wrote"""
        test_file = "Tests/images/hopper_g4_500.tif"
        with Image.open(test_file) as orig:
            out = str(tmp_path / "temp.tif")
            rot = orig.transpose(Image.ROTATE_90)
            assert rot.size == (500, 500)
            rot.save(out)

            with Image.open(out) as reread:
                assert reread.size == (500, 500)
                self._assert_noerr(tmp_path, reread)
                assert_image_equal(reread, rot)
                assert reread.info["compression"] == "group4"

                assert reread.info["compression"] == orig.info["compression"]

                assert orig.tobytes() != reread.tobytes()

    def test_adobe_deflate_tiff(self):
        test_file = "Tests/images/tiff_adobe_deflate.tif"
        with Image.open(test_file) as im:
            assert im.mode == "RGB"
            assert im.size == (278, 374)
            assert im.tile[0][:3] == ("libtiff", (0, 0, 278, 374), 0)
            im.load()

            assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")

    def test_write_metadata(self, tmp_path):
        """ Test metadata writing through libtiff """
        for legacy_api in [False, True]:
            f = str(tmp_path / "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:
                            assert (
                                c_float(val[0][0] / val[0][1]).value
                                == c_float(value[0][0] / value[0][1]).value
                            ), ("%s didn't roundtrip" % tag)
                        else:
                            assert c_float(val).value == c_float(value).value, (
                                "%s didn't roundtrip" % tag
                            )
                    else:
                        assert val == value, "%s didn't roundtrip" % tag

            # https://github.com/python-pillow/Pillow/issues/1561
            requested_fields = ["StripByteCounts", "RowsPerStrip", "StripOffsets"]
            for field in requested_fields:
                assert field in reloaded, "%s not in metadata" % field

    def test_additional_metadata(self, tmp_path):
        # 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
        with Image.open("Tests/images/hopper_g4.tif") as im:
            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 = str(tmp_path / "temp.tif")
            TiffImagePlugin.WRITE_LIBTIFF = True

            im.save(out, tiffinfo=new_ifd)

        TiffImagePlugin.WRITE_LIBTIFF = False

    def test_custom_metadata(self, tmp_path):
        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(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),
                ]
            )
        }

        libtiffs = [False]
        if Image.core.libtiff_support_custom_tags:
            libtiffs.append(True)

        for libtiff in libtiffs:
            TiffImagePlugin.WRITE_LIBTIFF = libtiff

            def check_tags(tiffinfo):
                im = hopper()

                out = str(tmp_path / "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
                            assert (
                                round(abs(float(reloaded_value) - float(value)), 7) == 0
                            )
                            continue

                        assert 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_xmlpacket_tag(self, tmp_path):
        TiffImagePlugin.WRITE_LIBTIFF = True

        out = str(tmp_path / "temp.tif")
        hopper().save(out, tiffinfo={700: b"xmlpacket tag"})
        TiffImagePlugin.WRITE_LIBTIFF = False

        with Image.open(out) as reloaded:
            if 700 in reloaded.tag_v2:
                assert reloaded.tag_v2[700] == b"xmlpacket tag"

    def test_int_dpi(self, tmp_path):
        # issue #1765
        im = hopper("RGB")
        out = str(tmp_path / "temp.tif")
        TiffImagePlugin.WRITE_LIBTIFF = True
        im.save(out, dpi=(72, 72))
        TiffImagePlugin.WRITE_LIBTIFF = False
        with Image.open(out) as reloaded:
            assert reloaded.info["dpi"] == (72.0, 72.0)

    def test_g3_compression(self, tmp_path):
        with Image.open("Tests/images/hopper_g4_500.tif") as i:
            out = str(tmp_path / "temp.tif")
            i.save(out, compression="group3")

            with Image.open(out) as reread:
                assert reread.info["compression"] == "group3"
                assert_image_equal(reread, i)

    def test_little_endian(self, tmp_path):
        with Image.open("Tests/images/16bit.deflate.tif") as im:
            assert im.getpixel((0, 0)) == 480
            assert im.mode == "I;16"

            b = im.tobytes()
            # Bytes are in image native order (little endian)
            assert b[0] == ord(b"\xe0")
            assert b[1] == ord(b"\x01")

            out = str(tmp_path / "temp.tif")
            # out = "temp.le.tif"
            im.save(out)
        with Image.open(out) as reread:
            assert reread.info["compression"] == im.info["compression"]
            assert 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, tmp_path):
        with Image.open("Tests/images/16bit.MM.deflate.tif") as im:
            assert im.getpixel((0, 0)) == 480
            assert im.mode == "I;16B"

            b = im.tobytes()

            # Bytes are in image native order (big endian)
            assert b[0] == ord(b"\x01")
            assert b[1] == ord(b"\xe0")

            out = str(tmp_path / "temp.tif")
            im.save(out)
            with Image.open(out) as reread:
                assert reread.info["compression"] == im.info["compression"]
                assert reread.getpixel((0, 0)) == 480

    def test_g4_string_info(self, tmp_path):
        """Tests String data in info directory"""
        test_file = "Tests/images/hopper_g4_500.tif"
        with Image.open(test_file) as orig:
            out = str(tmp_path / "temp.tif")

            orig.tag[269] = "temp.tif"
            orig.save(out)

        with Image.open(out) as reread:
            assert "temp.tif" == reread.tag_v2[269]
            assert "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
        with Image.open("Tests/images/12bit.cropped.tif") as im:
            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.

            assert_image_equal_tofile(im, "Tests/images/12in16bit.tif")

    def test_blur(self, tmp_path):
        # test case from irc, how to do blur on b/w image
        # and save to compressed tif.
        out = str(tmp_path / "temp.tif")
        with Image.open("Tests/images/pport_g4.tif") as im:
            im = im.convert("L")

        im = im.filter(ImageFilter.GaussianBlur(4))
        im.save(out, compression="tiff_adobe_deflate")

        with Image.open(out) as im2:
            im2.load()

            assert_image_equal(im, im2)

    def test_compressions(self, tmp_path):
        # Test various tiff compressions and assert similar image content but reduced
        # file sizes.
        im = hopper("RGB")
        out = str(tmp_path / "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)
            with Image.open(out) as im2:
                assert_image_equal(im, im2)

        im.save(out, compression="jpeg")
        size_jpeg = os.path.getsize(out)
        with Image.open(out) as im2:
            assert_image_similar(im, im2, 30)

        im.save(out, compression="jpeg", quality=30)
        size_jpeg_30 = os.path.getsize(out)
        with Image.open(out) as im3:
            assert_image_similar(im2, im3, 30)

        assert size_raw > size_compressed
        assert size_compressed > size_jpeg
        assert size_jpeg > size_jpeg_30

    def test_tiff_jpeg_compression(self, tmp_path):
        im = hopper("RGB")
        out = str(tmp_path / "temp.tif")
        im.save(out, compression="tiff_jpeg")

        with Image.open(out) as reloaded:
            assert reloaded.info["compression"] == "jpeg"

    def test_quality(self, tmp_path):
        im = hopper("RGB")
        out = str(tmp_path / "temp.tif")

        with pytest.raises(ValueError):
            im.save(out, compression="tiff_lzw", quality=50)
        with pytest.raises(ValueError):
            im.save(out, compression="jpeg", quality=-1)
        with pytest.raises(ValueError):
            im.save(out, compression="jpeg", quality=101)
        with pytest.raises(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, tmp_path):
        im = hopper("CMYK")
        out = str(tmp_path / "temp.tif")

        im.save(out, compression="tiff_adobe_deflate")
        with Image.open(out) as im2:
            assert_image_equal(im, im2)

    def xtest_bw_compression_w_rgb(self, tmp_path):
        """ 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 = str(tmp_path / "temp.tif")

        with pytest.raises(OSError):
            im.save(out, compression="tiff_ccitt")
        with pytest.raises(OSError):
            im.save(out, compression="group3")
        with pytest.raises(OSError):
            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.
        with pytest.raises(OSError):
            os.fstat(fn)
        im = None  # this should force even more closed.
        with pytest.raises(OSError):
            os.fstat(fn)
        with pytest.raises(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)
            assert im.size == (10, 10)
            assert im.convert("RGB").getpixel((0, 0)) == (0, 128, 0)
            assert im.tag.next

            im.seek(1)
            assert im.size == (10, 10)
            assert im.convert("RGB").getpixel((0, 0)) == (255, 0, 0)
            assert im.tag.next

            im.seek(2)
            assert not im.tag.next
            assert im.size == (20, 20)
            assert 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
            assert 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
        with Image.open("Tests/images/hopper.tif") as im:
            assert not im.tag.next
            im.load()
            assert not im.tag.next

    def test_4bit(self):
        # Arrange
        test_file = "Tests/images/hopper_gray_4bpp.tif"
        original = hopper("L")

        # Act
        TiffImagePlugin.READ_LIBTIFF = True
        with Image.open(test_file) as im:
            TiffImagePlugin.READ_LIBTIFF = False

            # Assert
            assert im.size == (128, 128)
            assert im.mode == "L"
            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:
            with Image.open(group[0]) as im:
                assert im.size == (128, 128)
                assert im.mode == "L"
                assert_image_similar(im, original, epsilon)
            for file in group[1:]:
                with Image.open(file) as im2:
                    assert im2.size == (128, 128)
                    assert im2.mode == "L"
                    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)

            with Image.open(buffer_io) as pilim_load:
                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, tmp_path):
        # issue 1597
        with Image.open("Tests/images/rdf.tif") as im:
            out = str(tmp_path / "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, tmp_path):
        # 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 = str(tmp_path / "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, tmp_path):
        # https://github.com/python-pillow/Pillow/issues/1651

        tmpfile = str(tmp_path / "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")
            assert icc is not None
        TiffImagePlugin.READ_LIBTIFF = True
        with Image.open("Tests/images/hopper.iccprofile.tif") as img:
            icc_libtiff = img.info.get("icc_profile")
            assert icc_libtiff is not None
        TiffImagePlugin.READ_LIBTIFF = False
        assert icc == icc_libtiff

    def test_write_icc(self, tmp_path):
        def check_write(libtiff):
            TiffImagePlugin.WRITE_LIBTIFF = libtiff

            with Image.open("Tests/images/hopper.iccprofile.tif") as img:
                icc_profile = img.info["icc_profile"]

                out = str(tmp_path / "temp.tif")
                img.save(out, icc_profile=icc_profile)
            with Image.open(out) as reloaded:
                assert icc_profile == reloaded.info["icc_profile"]

        libtiffs = []
        if Image.core.libtiff_support_custom_tags:
            libtiffs.append(True)
        libtiffs.append(False)

        for libtiff in libtiffs:
            check_write(libtiff)

    def test_multipage_compression(self):
        with Image.open("Tests/images/compression.tif") as im:

            im.seek(0)
            assert im._compression == "tiff_ccitt"
            assert im.size == (10, 10)

            im.seek(1)
            assert im._compression == "packbits"
            assert im.size == (10, 10)
            im.load()

            im.seek(0)
            assert im._compression == "tiff_ccitt"
            assert im.size == (10, 10)
            im.load()

    def test_save_tiff_with_jpegtables(self, tmp_path):
        # Arrange
        outfile = str(tmp_path / "temp.tif")

        # Created with ImageMagick: convert hopper.jpg hopper_jpg.tif
        # Contains JPEGTables (347) tag
        infile = "Tests/images/hopper_jpg.tif"
        with Image.open(infile) as im:
            # Act / Assert
            # Should not raise UnicodeDecodeError or anything else
            im.save(outfile)

    def test_16bit_RGB_tiff(self):
        with Image.open("Tests/images/tiff_16bit_RGB.tiff") as im:
            assert im.mode == "RGB"
            assert im.size == (100, 40)
            assert im.tile, [
                (
                    "libtiff",
                    (0, 0, 100, 40),
                    0,
                    ("RGB;16N", "tiff_adobe_deflate", False, 8),
                )
            ]
            im.load()

            assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGB_target.png")

    def test_16bit_RGBa_tiff(self):
        with Image.open("Tests/images/tiff_16bit_RGBa.tiff") as im:
            assert im.mode == "RGBA"
            assert im.size == (100, 40)
            assert im.tile, [
                ("libtiff", (0, 0, 100, 40), 0, ("RGBa;16N", "tiff_lzw", False, 38236),)
            ]
            im.load()

            assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGBa_target.png")

    @skip_unless_feature("jpg")
    def test_gimp_tiff(self):
        # Read TIFF JPEG images from GIMP [@PIL168]
        filename = "Tests/images/pil168.tif"
        with Image.open(filename) as im:
            assert im.mode == "RGB"
            assert im.size == (256, 256)
            assert im.tile == [
                ("libtiff", (0, 0, 256, 256), 0, ("RGB", "jpeg", False, 5122))
            ]
            im.load()

            assert_image_equal_tofile(im, "Tests/images/pil168.png")

    def test_sampleformat(self):
        # https://github.com/python-pillow/Pillow/issues/1466
        with Image.open("Tests/images/copyleft.tiff") as im:
            assert im.mode == "RGB"

            assert_image_equal_tofile(im, "Tests/images/copyleft.png", mode="RGB")

    def test_lzw(self):
        with Image.open("Tests/images/hopper_lzw.tif") as im:
            assert im.mode == "RGB"
            assert im.size == (128, 128)
            assert im.format == "TIFF"
            im2 = hopper()
            assert_image_similar(im, im2, 5)

    def test_strip_cmyk_jpeg(self):
        infile = "Tests/images/tiff_strip_cmyk_jpeg.tif"
        with Image.open(infile) as im:
            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"
        with Image.open(infile) as im:
            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"
        with Image.open(infile) as im:
            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"
        with Image.open(infile) as im:
            assert_image_equal_tofile(im, "Tests/images/flower2.jpg")

    def test_tiled_cmyk_jpeg(self):
        infile = "Tests/images/tiff_tiled_cmyk_jpeg.tif"
        with Image.open(infile) as im:
            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"
        with Image.open(infile) as im:
            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"
        with Image.open(infile) as im:
            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"
        with Image.open(infile) as im:
            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()
        assert im.size == (950, 975)

    def test_orientation(self):
        with Image.open("Tests/images/g4_orientation_1.tif") as base_im:
            for i in range(2, 9):
                with Image.open("Tests/images/g4_orientation_" + str(i) + ".tif") as im:
                    im.load()

                    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()

    def test_realloc_overflow(self):
        TiffImagePlugin.READ_LIBTIFF = True
        with Image.open("Tests/images/tiff_overflow_rows_per_strip.tif") as im:
            with pytest.raises(OSError) as e:
                im.load()

            # Assert that the error code is IMAGING_CODEC_MEMORY
            assert str(e.value) == "-9"
        TiffImagePlugin.READ_LIBTIFF = False