diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
index e14aadcb48bd..bf710705f202 100644
--- a/lib/matplotlib/backends/backend_pdf.py
+++ b/lib/matplotlib/backends/backend_pdf.py
@@ -1626,6 +1626,13 @@ def check_gc(self, gc, fillcolor=None):
orig_alphas = getattr(gc, '_effective_alphas', (1.0, 1.0))
+ if gc._rgb is None:
+ # it should not matter what color here
+ # since linewidth should be 0
+ # unless affected by global settings in rcParams
+ # hence setting zero alpha just incase
+ gc._rgb = [0, 0, 0, 0]
+
if gc._forced_alpha:
gc._effective_alphas = (gc._alpha, gc._alpha)
elif fillcolor is None or len(fillcolor) < 4:
diff --git a/lib/matplotlib/testing/compare.py b/lib/matplotlib/testing/compare.py
index c3d649e38069..b6f508660fc9 100644
--- a/lib/matplotlib/testing/compare.py
+++ b/lib/matplotlib/testing/compare.py
@@ -355,8 +355,8 @@ def crop_to_same(actual_path, actual_image, expected_path, expected_image):
# clip the images to the same size -- this is useful only when
# comparing eps to pdf
if actual_path[-7:-4] == 'eps' and expected_path[-7:-4] == 'pdf':
- aw, ah = actual_image.shape
- ew, eh = expected_image.shape
+ aw, ah, ad = actual_image.shape
+ ew, eh, ed = expected_image.shape
actual_image = actual_image[int(aw / 2 - ew / 2):int(
aw / 2 + ew / 2), int(ah / 2 - eh / 2):int(ah / 2 + eh / 2)]
return actual_image, expected_image
diff --git a/lib/matplotlib/tests/test_backend_pdf.py b/lib/matplotlib/tests/test_backend_pdf.py
index 3529ea8541db..275748e2aec2 100644
--- a/lib/matplotlib/tests/test_backend_pdf.py
+++ b/lib/matplotlib/tests/test_backend_pdf.py
@@ -19,7 +19,9 @@
_determinism_check)
from matplotlib.testing.decorators import image_comparison
from matplotlib import dviread
+from matplotlib.testing.compare import compare_images
+import matplotlib as mpl
needs_tex = pytest.mark.xfail(
not checkdep_tex(),
@@ -191,3 +193,18 @@ def psfont(*args, **kwargs):
ax.text(0.5, 0.5, 'hello')
with tempfile.TemporaryFile() as tmpfile, pytest.raises(ValueError):
fig.savefig(tmpfile, format='pdf')
+
+
+@pytest.fixture(scope='function')
+def test_pdf_savefig_when_color_is_none(tempdir_factory):
+ rcParams['_internal.classic_mode'] = False
+ plt.subplot()
+ plt.axis('off')
+ plt.plot(np.sin(np.linspace(-5, 5, 100)), 'v', c='none')
+ tmpdir_name = str(np.random.randint(100000, 10000000))
+ actual_image = tempdir_factory.mktemp(tmpdir_name).join('figure.pdf')
+ expected_image = tempdir_factory.mktemp(tmpdir_name).join('figure.eps')
+ plt.savefig(str(actual_image), format='pdf')
+ plt.savefig(str(expected_image), format='eps')
+ result = compare_images(str(actual_image), str(expected_image), 0)
+ assert result is None
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