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Pillow/Tests/test_file_gif.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 io import BytesIO
from PIL import GifImagePlugin, Image, ImageDraw, ImagePalette
from .helper import PillowTestCase, hopper, is_pypy, netpbm_available, unittest
try:
from PIL import _webp
HAVE_WEBP = True
except ImportError:
HAVE_WEBP = False
codecs = dir(Image.core)
# sample gif stream
TEST_GIF = "Tests/images/hopper.gif"
with open(TEST_GIF, "rb") as f:
data = f.read()
class TestFileGif(PillowTestCase):
def setUp(self):
if "gif_encoder" not in codecs or "gif_decoder" not in codecs:
self.skipTest("gif support not available") # can this happen?
def test_sanity(self):
with Image.open(TEST_GIF) as im:
im.load()
self.assertEqual(im.mode, "P")
self.assertEqual(im.size, (128, 128))
self.assertEqual(im.format, "GIF")
self.assertEqual(im.info["version"], b"GIF89a")
@unittest.skipIf(is_pypy(), "Requires CPython")
def test_unclosed_file(self):
def open():
im = Image.open(TEST_GIF)
im.load()
self.assert_warning(ResourceWarning, open)
def test_closed_file(self):
def open():
im = Image.open(TEST_GIF)
im.load()
im.close()
self.assert_warning(None, open)
def test_context_manager(self):
def open():
with Image.open(TEST_GIF) as im:
im.load()
self.assert_warning(None, open)
def test_invalid_file(self):
invalid_file = "Tests/images/flower.jpg"
self.assertRaises(SyntaxError, GifImagePlugin.GifImageFile, invalid_file)
def test_optimize(self):
def test_grayscale(optimize):
im = Image.new("L", (1, 1), 0)
filename = BytesIO()
im.save(filename, "GIF", optimize=optimize)
return len(filename.getvalue())
def test_bilevel(optimize):
im = Image.new("1", (1, 1), 0)
test_file = BytesIO()
im.save(test_file, "GIF", optimize=optimize)
return len(test_file.getvalue())
self.assertEqual(test_grayscale(0), 800)
self.assertEqual(test_grayscale(1), 44)
self.assertEqual(test_bilevel(0), 800)
self.assertEqual(test_bilevel(1), 800)
def test_optimize_correctness(self):
# 256 color Palette image, posterize to > 128 and < 128 levels
# Size bigger and smaller than 512x512
# Check the palette for number of colors allocated.
# Check for correctness after conversion back to RGB
def check(colors, size, expected_palette_length):
# make an image with empty colors in the start of the palette range
im = Image.frombytes(
"P",
(colors, colors),
bytes(bytearray(range(256 - colors, 256)) * colors),
)
im = im.resize((size, size))
outfile = BytesIO()
im.save(outfile, "GIF")
outfile.seek(0)
reloaded = Image.open(outfile)
# check palette length
palette_length = max(i + 1 for i, v in enumerate(reloaded.histogram()) if v)
self.assertEqual(expected_palette_length, palette_length)
self.assert_image_equal(im.convert("RGB"), reloaded.convert("RGB"))
# These do optimize the palette
check(128, 511, 128)
check(64, 511, 64)
check(4, 511, 4)
# These don't optimize the palette
check(128, 513, 256)
check(64, 513, 256)
check(4, 513, 256)
# other limits that don't optimize the palette
check(129, 511, 256)
check(255, 511, 256)
check(256, 511, 256)
def test_optimize_full_l(self):
im = Image.frombytes("L", (16, 16), bytes(bytearray(range(256))))
test_file = BytesIO()
im.save(test_file, "GIF", optimize=True)
self.assertEqual(im.mode, "L")
def test_roundtrip(self):
out = self.tempfile("temp.gif")
im = hopper()
im.save(out)
with Image.open(out) as reread:
self.assert_image_similar(reread.convert("RGB"), im, 50)
def test_roundtrip2(self):
# see https://github.com/python-pillow/Pillow/issues/403
out = self.tempfile("temp.gif")
with Image.open(TEST_GIF) as im:
im2 = im.copy()
im2.save(out)
with Image.open(out) as reread:
self.assert_image_similar(reread.convert("RGB"), hopper(), 50)
def test_roundtrip_save_all(self):
# Single frame image
out = self.tempfile("temp.gif")
im = hopper()
im.save(out, save_all=True)
with Image.open(out) as reread:
self.assert_image_similar(reread.convert("RGB"), im, 50)
# Multiframe image
with Image.open("Tests/images/dispose_bgnd.gif") as im:
out = self.tempfile("temp.gif")
im.save(out, save_all=True)
with Image.open(out) as reread:
self.assertEqual(reread.n_frames, 5)
def test_headers_saving_for_animated_gifs(self):
important_headers = ["background", "version", "duration", "loop"]
# Multiframe image
with Image.open("Tests/images/dispose_bgnd.gif") as im:
info = im.info.copy()
out = self.tempfile("temp.gif")
im.save(out, save_all=True)
with Image.open(out) as reread:
for header in important_headers:
self.assertEqual(info[header], reread.info[header])
def test_palette_handling(self):
# see https://github.com/python-pillow/Pillow/issues/513
with Image.open(TEST_GIF) as im:
im = im.convert("RGB")
im = im.resize((100, 100), Image.LANCZOS)
im2 = im.convert("P", palette=Image.ADAPTIVE, colors=256)
f = self.tempfile("temp.gif")
im2.save(f, optimize=True)
with Image.open(f) as reloaded:
self.assert_image_similar(im, reloaded.convert("RGB"), 10)
def test_palette_434(self):
# see https://github.com/python-pillow/Pillow/issues/434
def roundtrip(im, *args, **kwargs):
out = self.tempfile("temp.gif")
im.copy().save(out, *args, **kwargs)
reloaded = Image.open(out)
return reloaded
orig = "Tests/images/test.colors.gif"
with Image.open(orig) as im:
with roundtrip(im) as reloaded:
self.assert_image_similar(im, reloaded, 1)
with roundtrip(im, optimize=True) as reloaded:
self.assert_image_similar(im, reloaded, 1)
im = im.convert("RGB")
# check automatic P conversion
with roundtrip(im) as reloaded:
reloaded = reloaded.convert("RGB")
self.assert_image_equal(im, reloaded)
@unittest.skipUnless(netpbm_available(), "netpbm not available")
def test_save_netpbm_bmp_mode(self):
with Image.open(TEST_GIF) as img:
img = img.convert("RGB")
tempfile = self.tempfile("temp.gif")
GifImagePlugin._save_netpbm(img, 0, tempfile)
with Image.open(tempfile) as reloaded:
self.assert_image_similar(img, reloaded.convert("RGB"), 0)
@unittest.skipUnless(netpbm_available(), "netpbm not available")
def test_save_netpbm_l_mode(self):
with Image.open(TEST_GIF) as img:
img = img.convert("L")
tempfile = self.tempfile("temp.gif")
GifImagePlugin._save_netpbm(img, 0, tempfile)
with Image.open(tempfile) as reloaded:
self.assert_image_similar(img, reloaded.convert("L"), 0)
def test_seek(self):
with Image.open("Tests/images/dispose_none.gif") as img:
framecount = 0
try:
while True:
framecount += 1
img.seek(img.tell() + 1)
except EOFError:
self.assertEqual(framecount, 5)
def test_seek_info(self):
with Image.open("Tests/images/iss634.gif") as im:
info = im.info.copy()
im.seek(1)
im.seek(0)
self.assertEqual(im.info, info)
def test_seek_rewind(self):
with Image.open("Tests/images/iss634.gif") as im:
im.seek(2)
im.seek(1)
with Image.open("Tests/images/iss634.gif") as expected:
expected.seek(1)
self.assert_image_equal(im, expected)
def test_n_frames(self):
for path, n_frames in [[TEST_GIF, 1], ["Tests/images/iss634.gif", 42]]:
# Test is_animated before n_frames
with Image.open(path) as im:
self.assertEqual(im.is_animated, n_frames != 1)
# Test is_animated after n_frames
with Image.open(path) as im:
self.assertEqual(im.n_frames, n_frames)
self.assertEqual(im.is_animated, n_frames != 1)
def test_eoferror(self):
with Image.open(TEST_GIF) as im:
n_frames = im.n_frames
# Test seeking past the last frame
self.assertRaises(EOFError, im.seek, n_frames)
self.assertLess(im.tell(), n_frames)
# Test that seeking to the last frame does not raise an error
im.seek(n_frames - 1)
def test_dispose_none(self):
with Image.open("Tests/images/dispose_none.gif") as img:
try:
while True:
img.seek(img.tell() + 1)
self.assertEqual(img.disposal_method, 1)
except EOFError:
pass
def test_dispose_background(self):
with Image.open("Tests/images/dispose_bgnd.gif") as img:
try:
while True:
img.seek(img.tell() + 1)
self.assertEqual(img.disposal_method, 2)
except EOFError:
pass
def test_dispose_previous(self):
with Image.open("Tests/images/dispose_prev.gif") as img:
try:
while True:
img.seek(img.tell() + 1)
self.assertEqual(img.disposal_method, 3)
except EOFError:
pass
def test_save_dispose(self):
out = self.tempfile("temp.gif")
im_list = [
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#111"),
Image.new("L", (100, 100), "#222"),
]
for method in range(0, 4):
im_list[0].save(
out, save_all=True, append_images=im_list[1:], disposal=method
)
with Image.open(out) as img:
for _ in range(2):
img.seek(img.tell() + 1)
self.assertEqual(img.disposal_method, method)
# check per frame disposal
im_list[0].save(
out,
save_all=True,
append_images=im_list[1:],
disposal=tuple(range(len(im_list))),
)
with Image.open(out) as img:
for i in range(2):
img.seek(img.tell() + 1)
self.assertEqual(img.disposal_method, i + 1)
def test_dispose2_palette(self):
out = self.tempfile("temp.gif")
# 4 backgrounds: White, Grey, Black, Red
circles = [(255, 255, 255), (153, 153, 153), (0, 0, 0), (255, 0, 0)]
im_list = []
for circle in circles:
img = Image.new("RGB", (100, 100), (255, 0, 0))
# Red circle in center of each frame
d = ImageDraw.Draw(img)
d.ellipse([(40, 40), (60, 60)], fill=circle)
im_list.append(img)
im_list[0].save(out, save_all=True, append_images=im_list[1:], disposal=2)
with Image.open(out) as img:
for i, circle in enumerate(circles):
img.seek(i)
rgb_img = img.convert("RGB")
# Check top left pixel matches background
self.assertEqual(rgb_img.getpixel((0, 0)), (255, 0, 0))
# Center remains red every frame
self.assertEqual(rgb_img.getpixel((50, 50)), circle)
def test_dispose2_diff(self):
out = self.tempfile("temp.gif")
# 4 frames: red/blue, red/red, blue/blue, red/blue
circles = [
((255, 0, 0, 255), (0, 0, 255, 255)),
((255, 0, 0, 255), (255, 0, 0, 255)),
((0, 0, 255, 255), (0, 0, 255, 255)),
((255, 0, 0, 255), (0, 0, 255, 255)),
]
im_list = []
for i in range(len(circles)):
# Transparent BG
img = Image.new("RGBA", (100, 100), (255, 255, 255, 0))
# Two circles per frame
d = ImageDraw.Draw(img)
d.ellipse([(0, 30), (40, 70)], fill=circles[i][0])
d.ellipse([(60, 30), (100, 70)], fill=circles[i][1])
im_list.append(img)
im_list[0].save(
out, save_all=True, append_images=im_list[1:], disposal=2, transparency=0
)
with Image.open(out) as img:
for i, colours in enumerate(circles):
img.seek(i)
rgb_img = img.convert("RGBA")
# Check left circle is correct colour
self.assertEqual(rgb_img.getpixel((20, 50)), colours[0])
# Check right circle is correct colour
self.assertEqual(rgb_img.getpixel((80, 50)), colours[1])
# Check BG is correct colour
self.assertEqual(rgb_img.getpixel((1, 1)), (255, 255, 255, 0))
def test_dispose2_background(self):
out = self.tempfile("temp.gif")
im_list = []
im = Image.new("P", (100, 100))
d = ImageDraw.Draw(im)
d.rectangle([(50, 0), (100, 100)], fill="#f00")
d.rectangle([(0, 0), (50, 100)], fill="#0f0")
im_list.append(im)
im = Image.new("P", (100, 100))
d = ImageDraw.Draw(im)
d.rectangle([(0, 0), (100, 50)], fill="#f00")
d.rectangle([(0, 50), (100, 100)], fill="#0f0")
im_list.append(im)
im_list[0].save(
out, save_all=True, append_images=im_list[1:], disposal=[0, 2], background=1
)
with Image.open(out) as im:
im.seek(1)
self.assertEqual(im.getpixel((0, 0)), 0)
def test_iss634(self):
with Image.open("Tests/images/iss634.gif") as img:
# seek to the second frame
img.seek(img.tell() + 1)
# all transparent pixels should be replaced with the color from the
# first frame
self.assertEqual(img.histogram()[img.info["transparency"]], 0)
def test_duration(self):
duration = 1000
out = self.tempfile("temp.gif")
im = Image.new("L", (100, 100), "#000")
# Check that the argument has priority over the info settings
im.info["duration"] = 100
im.save(out, duration=duration)
with Image.open(out) as reread:
self.assertEqual(reread.info["duration"], duration)
def test_multiple_duration(self):
duration_list = [1000, 2000, 3000]
out = self.tempfile("temp.gif")
im_list = [
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#111"),
Image.new("L", (100, 100), "#222"),
]
# duration as list
im_list[0].save(
out, save_all=True, append_images=im_list[1:], duration=duration_list
)
with Image.open(out) as reread:
for duration in duration_list:
self.assertEqual(reread.info["duration"], duration)
try:
reread.seek(reread.tell() + 1)
except EOFError:
pass
# duration as tuple
im_list[0].save(
out, save_all=True, append_images=im_list[1:], duration=tuple(duration_list)
)
with Image.open(out) as reread:
for duration in duration_list:
self.assertEqual(reread.info["duration"], duration)
try:
reread.seek(reread.tell() + 1)
except EOFError:
pass
def test_identical_frames(self):
duration_list = [1000, 1500, 2000, 4000]
out = self.tempfile("temp.gif")
im_list = [
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#111"),
]
# duration as list
im_list[0].save(
out, save_all=True, append_images=im_list[1:], duration=duration_list
)
with Image.open(out) as reread:
# Assert that the first three frames were combined
self.assertEqual(reread.n_frames, 2)
# Assert that the new duration is the total of the identical frames
self.assertEqual(reread.info["duration"], 4500)
def test_identical_frames_to_single_frame(self):
for duration in ([1000, 1500, 2000, 4000], (1000, 1500, 2000, 4000), 8500):
out = self.tempfile("temp.gif")
im_list = [
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#000"),
Image.new("L", (100, 100), "#000"),
]
im_list[0].save(
out, save_all=True, append_images=im_list[1:], duration=duration
)
with Image.open(out) as reread:
# Assert that all frames were combined
self.assertEqual(reread.n_frames, 1)
# Assert that the new duration is the total of the identical frames
self.assertEqual(reread.info["duration"], 8500)
def test_number_of_loops(self):
number_of_loops = 2
out = self.tempfile("temp.gif")
im = Image.new("L", (100, 100), "#000")
im.save(out, loop=number_of_loops)
with Image.open(out) as reread:
self.assertEqual(reread.info["loop"], number_of_loops)
def test_background(self):
out = self.tempfile("temp.gif")
im = Image.new("L", (100, 100), "#000")
im.info["background"] = 1
im.save(out)
with Image.open(out) as reread:
self.assertEqual(reread.info["background"], im.info["background"])
if HAVE_WEBP and _webp.HAVE_WEBPANIM:
im = Image.open("Tests/images/hopper.webp")
self.assertIsInstance(im.info["background"], tuple)
im.save(out)
def test_comment(self):
with Image.open(TEST_GIF) as im:
self.assertEqual(
im.info["comment"], b"File written by Adobe Photoshop\xa8 4.0"
)
out = self.tempfile("temp.gif")
im = Image.new("L", (100, 100), "#000")
im.info["comment"] = b"Test comment text"
im.save(out)
with Image.open(out) as reread:
self.assertEqual(reread.info["comment"], im.info["comment"])
def test_comment_over_255(self):
out = self.tempfile("temp.gif")
im = Image.new("L", (100, 100), "#000")
comment = b"Test comment text"
while len(comment) < 256:
comment += comment
im.info["comment"] = comment
im.save(out)
with Image.open(out) as reread:
self.assertEqual(reread.info["comment"], comment)
def test_zero_comment_subblocks(self):
with Image.open("Tests/images/hopper_zero_comment_subblocks.gif") as im:
with Image.open(TEST_GIF) as expected:
self.assert_image_equal(im, expected)
def test_version(self):
out = self.tempfile("temp.gif")
def assertVersionAfterSave(im, version):
im.save(out)
with Image.open(out) as reread:
self.assertEqual(reread.info["version"], version)
# Test that GIF87a is used by default
im = Image.new("L", (100, 100), "#000")
assertVersionAfterSave(im, b"GIF87a")
# Test setting the version to 89a
im = Image.new("L", (100, 100), "#000")
im.info["version"] = b"89a"
assertVersionAfterSave(im, b"GIF89a")
# Test that adding a GIF89a feature changes the version
im.info["transparency"] = 1
assertVersionAfterSave(im, b"GIF89a")
# Test that a GIF87a image is also saved in that format
with Image.open("Tests/images/test.colors.gif") as im:
assertVersionAfterSave(im, b"GIF87a")
# Test that a GIF89a image is also saved in that format
im.info["version"] = b"GIF89a"
assertVersionAfterSave(im, b"GIF87a")
def test_append_images(self):
out = self.tempfile("temp.gif")
# Test appending single frame images
im = Image.new("RGB", (100, 100), "#f00")
ims = [Image.new("RGB", (100, 100), color) for color in ["#0f0", "#00f"]]
im.copy().save(out, save_all=True, append_images=ims)
with Image.open(out) as reread:
self.assertEqual(reread.n_frames, 3)
# Tests appending using a generator
def imGenerator(ims):
for im in ims:
yield im
im.save(out, save_all=True, append_images=imGenerator(ims))
with Image.open(out) as reread:
self.assertEqual(reread.n_frames, 3)
# Tests appending single and multiple frame images
with Image.open("Tests/images/dispose_none.gif") as im:
with Image.open("Tests/images/dispose_prev.gif") as im2:
im.save(out, save_all=True, append_images=[im2])
with Image.open(out) as reread:
self.assertEqual(reread.n_frames, 10)
def test_transparent_optimize(self):
# from issue #2195, if the transparent color is incorrectly
# optimized out, gif loses transparency
# Need a palette that isn't using the 0 color, and one
# that's > 128 items where the transparent color is actually
# the top palette entry to trigger the bug.
data = bytes(bytearray(range(1, 254)))
palette = ImagePalette.ImagePalette("RGB", list(range(256)) * 3)
im = Image.new("L", (253, 1))
im.frombytes(data)
im.putpalette(palette)
out = self.tempfile("temp.gif")
im.save(out, transparency=253)
with Image.open(out) as reloaded:
self.assertEqual(reloaded.info["transparency"], 253)
def test_rgb_transparency(self):
out = self.tempfile("temp.gif")
# Single frame
im = Image.new("RGB", (1, 1))
im.info["transparency"] = (255, 0, 0)
self.assert_warning(UserWarning, im.save, out)
with Image.open(out) as reloaded:
self.assertNotIn("transparency", reloaded.info)
# Multiple frames
im = Image.new("RGB", (1, 1))
im.info["transparency"] = b""
ims = [Image.new("RGB", (1, 1))]
self.assert_warning(UserWarning, im.save, out, save_all=True, append_images=ims)
with Image.open(out) as reloaded:
self.assertNotIn("transparency", reloaded.info)
def test_bbox(self):
out = self.tempfile("temp.gif")
im = Image.new("RGB", (100, 100), "#fff")
ims = [Image.new("RGB", (100, 100), "#000")]
im.save(out, save_all=True, append_images=ims)
with Image.open(out) as reread:
self.assertEqual(reread.n_frames, 2)
def test_palette_save_L(self):
# generate an L mode image with a separate palette
im = hopper("P")
im_l = Image.frombytes("L", im.size, im.tobytes())
palette = bytes(bytearray(im.getpalette()))
out = self.tempfile("temp.gif")
im_l.save(out, palette=palette)
with Image.open(out) as reloaded:
self.assert_image_equal(reloaded.convert("RGB"), im.convert("RGB"))
def test_palette_save_P(self):
# pass in a different palette, then construct what the image
# would look like.
# Forcing a non-straight grayscale palette.
im = hopper("P")
palette = bytes(bytearray([255 - i // 3 for i in range(768)]))
out = self.tempfile("temp.gif")
im.save(out, palette=palette)
with Image.open(out) as reloaded:
im.putpalette(palette)
self.assert_image_equal(reloaded, im)
def test_palette_save_ImagePalette(self):
# pass in a different palette, as an ImagePalette.ImagePalette
# effectively the same as test_palette_save_P
im = hopper("P")
palette = ImagePalette.ImagePalette("RGB", list(range(256))[::-1] * 3)
out = self.tempfile("temp.gif")
im.save(out, palette=palette)
with Image.open(out) as reloaded:
im.putpalette(palette)
self.assert_image_equal(reloaded, im)
def test_save_I(self):
# Test saving something that would trigger the auto-convert to 'L'
im = hopper("I")
out = self.tempfile("temp.gif")
im.save(out)
with Image.open(out) as reloaded:
self.assert_image_equal(reloaded.convert("L"), im.convert("L"))
def test_getdata(self):
# test getheader/getdata against legacy values
# Create a 'P' image with holes in the palette
im = Image._wedge().resize((16, 16))
im.putpalette(ImagePalette.ImagePalette("RGB"))
im.info = {"background": 0}
passed_palette = bytes(bytearray([255 - i // 3 for i in range(768)]))
GifImagePlugin._FORCE_OPTIMIZE = True
try:
h = GifImagePlugin.getheader(im, passed_palette)
d = GifImagePlugin.getdata(im)
import pickle
# Enable to get target values on pre-refactor version
# with open('Tests/images/gif_header_data.pkl', 'wb') as f:
# pickle.dump((h, d), f, 1)
with open("Tests/images/gif_header_data.pkl", "rb") as f:
(h_target, d_target) = pickle.load(f)
self.assertEqual(h, h_target)
self.assertEqual(d, d_target)
finally:
GifImagePlugin._FORCE_OPTIMIZE = False
def test_lzw_bits(self):
# see https://github.com/python-pillow/Pillow/issues/2811
with Image.open("Tests/images/issue_2811.gif") as im:
self.assertEqual(im.tile[0][3][0], 11) # LZW bits
# codec error prepatch
im.load()
def test_extents(self):
with Image.open("Tests/images/test_extents.gif") as im:
self.assertEqual(im.size, (100, 100))
im.seek(1)
self.assertEqual(im.size, (150, 150))
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