Backport PR matplotlib#14069: Don't try to use the colorbar formatter to format RGBA data.

dstansby · MeeseeksDev[bot] · commit 74f0f0abe5ce · 2019-04-29T10:51:34.000Z
diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
@@ -933,7 +933,7 @@ def get_cursor_data(self, event):
             return arr[i, j]
 
     def format_cursor_data(self, data):
-        if self.colorbar:
+        if np.ndim(data) == 0 and self.colorbar:
             return (
                 "["
                 + cbook.strip_math(
