matplotlib
diff --git a/‎lib/matplotlib/colors.py
Copy file name to clipboardExpand all lines: lib/matplotlib/colors.py
+2Lines changed: 2 additions & 0 deletions b/‎lib/matplotlib/colors.py
Copy file name to clipboardExpand all lines: lib/matplotlib/colors.py
+2Lines changed: 2 additions & 0 deletions
@@ -925,6 +925,8 @@ def __call__(self, value, clip=None):
                 result = np.ma.array(np.clip(result.filled(vmax), vmin, vmax),
                                      mask=mask)
             # ma division is very slow; we can take a shortcut
+            # use np.asarray so data passed in as an ndarray subclass are
+            # interpreted as an ndarray. See issue #6622.
             resdat = np.asarray(result.data)
             resdat -= vmin
             resdat /= (vmax - vmin)