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DOC / BUG: Fix savefig to GIF format with .gif suffix#29372

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Merged
QuLogic merged 3 commits intomatplotlib:mainfromlpsinger:savefig-gif
Jan 16, 2025
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6 changes: 6 additions & 0 deletionsdoc/users/next_whats_new/gif_savefig.rst
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@@ -0,0 +1,6 @@
Saving figures as GIF works again
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

According to the figure documentation, the ``savefig`` method supports the
GIF format with the file extension ``.gif``. However, GIF support had been
broken since Matplotlib 2.0.0. It works again.
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Expand Up@@ -44,7 +44,7 @@
# regions can overlap and alpha allows you to see both. Note that the
# postscript format does not support alpha (this is a postscript
# limitation, not a matplotlib limitation), so when using alpha save
# your figures in PNG, PDF or SVG.
# your figures inGIF,PNG, PDF or SVG.
#
# Our next example computes two populations of random walkers with a
# different mean and standard deviation of the normal distributions from
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2 changes: 2 additions & 0 deletionslib/matplotlib/backend_bases.py
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Expand Up@@ -62,6 +62,7 @@
_log = logging.getLogger(__name__)
_default_filetypes = {
'eps': 'Encapsulated Postscript',
'gif': 'Graphics Interchange Format',
'jpg': 'Joint Photographic Experts Group',
'jpeg': 'Joint Photographic Experts Group',
'pdf': 'Portable Document Format',
Expand All@@ -78,6 +79,7 @@
}
_default_backends = {
'eps': 'matplotlib.backends.backend_ps',
'gif': 'matplotlib.backends.backend_agg',
'jpg': 'matplotlib.backends.backend_agg',
'jpeg': 'matplotlib.backends.backend_agg',
'pdf': 'matplotlib.backends.backend_pdf',
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7 changes: 5 additions & 2 deletionslib/matplotlib/backends/backend_agg.py
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Expand Up@@ -490,6 +490,9 @@ def print_to_buffer(self):
# print_figure(), and the latter ensures that `self.figure.dpi` already
# matches the dpi kwarg (if any).

def print_gif(self, filename_or_obj, *, metadata=None, pil_kwargs=None):
self._print_pil(filename_or_obj, "gif", pil_kwargs, metadata)

def print_jpg(self, filename_or_obj, *, metadata=None, pil_kwargs=None):
# savefig() has already applied savefig.facecolor; we now set it to
# white to make imsave() blend semi-transparent figures against an
Expand All@@ -507,7 +510,7 @@ def print_tif(self, filename_or_obj, *, metadata=None, pil_kwargs=None):
def print_webp(self, filename_or_obj, *, metadata=None, pil_kwargs=None):
self._print_pil(filename_or_obj, "webp", pil_kwargs, metadata)

print_jpg.__doc__, print_tif.__doc__, print_webp.__doc__ = map(
print_gif.__doc__,print_jpg.__doc__, print_tif.__doc__, print_webp.__doc__ = map(
"""
Write the figure to a {} file.

Expand All@@ -518,7 +521,7 @@ def print_webp(self, filename_or_obj, *, metadata=None, pil_kwargs=None):
pil_kwargs : dict, optional
Additional keyword arguments that are passed to
`PIL.Image.Image.save` when saving the figure.
""".format, ["JPEG", "TIFF", "WebP"])
""".format, ["GIF", "JPEG", "TIFF", "WebP"])


@_Backend.export
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16 changes: 16 additions & 0 deletionslib/matplotlib/testing/compare.py
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Expand Up@@ -99,6 +99,16 @@
return bytes(buf)


class _MagickConverter:
def __call__(self, orig, dest):
try:
subprocess.run(
[mpl._get_executable_info("magick").executable, orig, dest],
check=True)
except subprocess.CalledProcessError as e:
raise _ConverterError() from e

Check warning on line 109 in lib/matplotlib/testing/compare.py

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Codecov/ codecov/patch

lib/matplotlib/testing/compare.py#L108-L109

Added lines #L108 - L109 were not covered by tests


class _GSConverter(_Converter):
def __call__(self, orig, dest):
if not self._proc:
Expand DownExpand Up@@ -230,6 +240,12 @@


def _update_converter():
try:
mpl._get_executable_info("magick")
except mpl.ExecutableNotFoundError:
pass
else:
converter['gif'] = _MagickConverter()
try:
mpl._get_executable_info("gs")
except mpl.ExecutableNotFoundError:
Expand Down
3 changes: 2 additions & 1 deletionlib/matplotlib/testing/decorators.py
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Expand Up@@ -204,6 +204,7 @@ def wrapper(*args, extension, request, **kwargs):

if extension not in comparable_formats():
reason = {
'gif': 'because ImageMagick is not installed',
'pdf': 'because Ghostscript is not installed',
'eps': 'because Ghostscript is not installed',
'svg': 'because Inkscape is not installed',
Expand DownExpand Up@@ -279,7 +280,7 @@ def image_comparison(baseline_images, extensions=None, tol=0,
extensions : None or list of str
The list of extensions to test, e.g. ``['png', 'pdf']``.

If *None*, defaults to all supported extensions: png, pdf, and svg.
If *None*, defaults to: png, pdf, and svg.

When testing a single extension, it can be directly included in the
names passed to *baseline_images*. In that case, *extensions* must not
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18 changes: 18 additions & 0 deletionslib/matplotlib/tests/test_agg.py
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Expand Up@@ -263,6 +263,24 @@ def test_pil_kwargs_webp():
assert buf_large.getbuffer().nbytes > buf_small.getbuffer().nbytes


def test_gif_no_alpha():
plt.plot([0, 1, 2], [0, 1, 0])
buf = io.BytesIO()
plt.savefig(buf, format="gif", transparent=False)
im = Image.open(buf)
assert im.mode == "P"
assert im.info["transparency"] >= len(im.palette.colors)


def test_gif_alpha():
plt.plot([0, 1, 2], [0, 1, 0])
buf = io.BytesIO()
plt.savefig(buf, format="gif", transparent=True)
im = Image.open(buf)
assert im.mode == "P"
assert im.info["transparency"] < len(im.palette.colors)


@pytest.mark.skipif(not features.check("webp"), reason="WebP support not available")
def test_webp_alpha():
plt.plot([0, 1, 2], [0, 1, 0])
Expand Down
2 changes: 1 addition & 1 deletionlib/matplotlib/tests/test_agg_filter.py
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Expand Up@@ -5,7 +5,7 @@


@image_comparison(baseline_images=['agg_filter_alpha'],
extensions=['png', 'pdf'])
extensions=['gif', 'png', 'pdf'])
def test_agg_filter_alpha():
# Remove this line when this test image is regenerated.
plt.rcParams['pcolormesh.snap'] = False
Expand Down
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