From 679d3ed897ee24d12a1038c212c2c296249444e4 Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Tue, 10 Oct 2017 19:04:33 -0400
Subject: [PATCH] Backport PR #9335: Fix poorly done deprecations in image.py.

---
 lib/matplotlib/backends/qt_editor/figureoptions.py | 4 ++--
 lib/matplotlib/image.py                            | 5 ++++-
 lib/matplotlib/tests/test_image.py                 | 8 ++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/lib/matplotlib/backends/qt_editor/figureoptions.py b/lib/matplotlib/backends/qt_editor/figureoptions.py
index af9feaf5e5c6..40572c8bd827 100644
--- a/lib/matplotlib/backends/qt_editor/figureoptions.py
+++ b/lib/matplotlib/backends/qt_editor/figureoptions.py
@@ -16,7 +16,7 @@
 import re
 
 import matplotlib
-from matplotlib import cm, markers, colors as mcolors
+from matplotlib import cm, colors as mcolors, markers, image as mimage
 import matplotlib.backends.qt_editor.formlayout as formlayout
 from matplotlib.backends.qt_compat import QtGui
 
@@ -165,7 +165,7 @@ def prepare_data(d, init):
             ('Max. value', high),
             ('Interpolation',
              [image.get_interpolation()]
-             + [(name, name) for name in sorted(image.iterpnames)])]
+             + [(name, name) for name in sorted(mimage.interpolations_names)])]
         images.append([imagedata, label, ""])
     # Is there an image displayed?
     has_image = bool(images)
diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
index ea2331cb48a7..6b8477f63018 100644
--- a/lib/matplotlib/image.py
+++ b/lib/matplotlib/image.py
@@ -180,15 +180,18 @@ def _rgb_to_rgba(A):
 class _ImageBase(martist.Artist, cm.ScalarMappable):
     zorder = 0
 
+    @property
     @cbook.deprecated("2.1")
     def _interpd(self):
         return _interpd_
 
+    @property
     @cbook.deprecated("2.1")
     def _interpdr(self):
         return {v: k for k, v in six.iteritems(_interpd_)}
 
-    @cbook.deprecated("2.1")
+    @property
+    @cbook.deprecated("2.1", alternative="mpl.image.interpolation_names")
     def iterpnames(self):
         return interpolations_names
 
diff --git a/lib/matplotlib/tests/test_image.py b/lib/matplotlib/tests/test_image.py
index 9f99fdc6ec8b..15c148f17cdb 100644
--- a/lib/matplotlib/tests/test_image.py
+++ b/lib/matplotlib/tests/test_image.py
@@ -827,3 +827,11 @@ def test_imshow_float128():
 def test_imshow_bool():
     fig, ax = plt.subplots()
     ax.imshow(np.array([[True, False], [False, True]], dtype=bool))
+
+
+def test_imshow_deprecated_interd_warn():
+    im = plt.imshow([[1, 2], [3, np.nan]])
+    for k in ('_interpd', '_interpdr', 'iterpnames'):
+        with warnings.catch_warnings(record=True) as warns:
+            getattr(im, k)
+        assert len(warns) == 1