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

from PIL import Image, TiffImagePlugin, TiffTags, features

from .helper import (
    PillowTestCase,
    assert_image_equal,
    assert_image_equal_tofile,
    assert_image_similar,
    assert_image_similar_tofile,
    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"
        with Image.open(test_file) as im:
            self.assertEqual(im.size, (500, 500))
            self._assert_noerr(im)

    def test_g4_large(self):
        test_file = "Tests/images/pport_g4.tif"
        with Image.open(test_file) as im:
            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:
            with Image.open(f) as im:
                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)
        with Image.open(s) as im:
            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)
        with Image.open(r) as im:
            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"""
        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):
        """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 = self.tempfile("temp.tif")
            rot = orig.transpose(Image.ROTATE_90)
            self.assertEqual(rot.size, (500, 500))
            rot.save(out)

            with Image.open(out) as reread:
                self.assertEqual(reread.size, (500, 500))
                self._assert_noerr(reread)
                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"
        with Image.open(test_file) as im:
            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()

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

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

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

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

            out = self.tempfile("temp.tif")
            # out = "temp.le.tif"
            im.save(out)
        with Image.open(out) as reread:
            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):
        with Image.open("Tests/images/16bit.MM.deflate.tif") as im:
            self.assertEqual(im.getpixel((0, 0)), 480)
            self.assertEqual(im.mode, "I;16B")

            b = im.tobytes()

            # Bytes are in image native order (big endian)
            self.assertEqual(b[0], ord(b"\x01"))
            self.assertEqual(b[1], ord(b"\xe0"))

            out = self.tempfile("temp.tif")
            im.save(out)
            with Image.open(out) as reread:
                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"
        with Image.open(test_file) as orig:
            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
        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):
        # 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")
        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):
        # 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)
            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)

        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")
        with Image.open(out) as im2:
            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
        with Image.open("Tests/images/hopper.tif") as im:
            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
        with Image.open(test_file) as im:
            TiffImagePlugin.READ_LIBTIFF = False

            # Assert
            self.assertEqual(im.size, (128, 128))
            self.assertEqual(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:
                self.assertEqual(im.size, (128, 128))
                self.assertEqual(im.mode, "L")
                assert_image_similar(im, original, epsilon)
            for file in group[1:]:
                with Image.open(file) as im2:
                    self.assertEqual(im2.size, (128, 128))
                    self.assertEqual(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):
        # issue 1597
        with Image.open("Tests/images/rdf.tif") as im:
            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"
        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:
            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()

            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:
            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()

            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"
        with Image.open(filename) as im:
            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()

            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:
            self.assertEqual(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:
            self.assertEqual(im.mode, "RGB")
            self.assertEqual(im.size, (128, 128))
            self.assertEqual(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()
        self.assertEqual(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 self.assertRaises(IOError) as e:
                im.load()

            # Assert that the error code is IMAGING_CODEC_MEMORY
            self.assertEqual(str(e.exception), "-9")
        TiffImagePlugin.READ_LIBTIFF = False