diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
index 95bb42d75c61..b710e7ac0901 100644
--- a/lib/matplotlib/image.py
+++ b/lib/matplotlib/image.py
@@ -532,9 +532,9 @@ def _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification=1.0,
# we have re-set the vmin/vmax to account for small errors
# that may have moved input values in/out of range
s_vmin, s_vmax = vrange
- if isinstance(self.norm, mcolors.LogNorm):
- if s_vmin < 0:
- s_vmin = max(s_vmin, np.finfo(scaled_dtype).eps)
+ if isinstance(self.norm, mcolors.LogNorm) and s_vmin <= 0:
+ # Don't give 0 or negative values to LogNorm
+ s_vmin = np.finfo(scaled_dtype).eps
with cbook._setattr_cm(self.norm,
vmin=s_vmin,
vmax=s_vmax,
diff --git a/lib/matplotlib/tests/test_image.py b/lib/matplotlib/tests/test_image.py
index 69fb89bcd4fb..42ed7479ae54 100644
--- a/lib/matplotlib/tests/test_image.py
+++ b/lib/matplotlib/tests/test_image.py
@@ -1233,23 +1233,24 @@ def test_imshow_quantitynd():
fig.canvas.draw()
+@pytest.mark.parametrize('x', [-1, 1])
@check_figures_equal(extensions=['png'])
-def test_huge_range_log(fig_test, fig_ref):
- data = np.full((5, 5), -1, dtype=np.float64)
+def test_huge_range_log(fig_test, fig_ref, x):
+ # parametrize over bad lognorm -1 values and large range 1 -> 1e20
+ data = np.full((5, 5), x, dtype=np.float64)
data[0:2, :] = 1E20
ax = fig_test.subplots()
- im = ax.imshow(data, norm=colors.LogNorm(vmin=100, vmax=data.max()),
- interpolation='nearest', cmap='viridis')
+ ax.imshow(data, norm=colors.LogNorm(vmin=1, vmax=data.max()),
+ interpolation='nearest', cmap='viridis')
- data = np.full((5, 5), -1, dtype=np.float64)
+ data = np.full((5, 5), x, dtype=np.float64)
data[0:2, :] = 1000
- cmap = copy(plt.get_cmap('viridis'))
- cmap.set_under('w')
ax = fig_ref.subplots()
- im = ax.imshow(data, norm=colors.Normalize(vmin=100, vmax=data.max()),
- interpolation='nearest', cmap=cmap)
+ cmap = plt.get_cmap('viridis').with_extremes(under='w')
+ ax.imshow(data, norm=colors.Normalize(vmin=1, vmax=data.max()),
+ interpolation='nearest', cmap=cmap)
@check_figures_equal()
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