matplotlib
diff --git a/‎lib/matplotlib/backends/backend_tkcairo.py‎
Lines changed: 4 additions & 6 deletions b/‎lib/matplotlib/backends/backend_tkcairo.py‎
Lines changed: 4 additions & 6 deletions
diff --git a/‎lib/matplotlib/cbook.py‎
Lines changed: 2 additions & 0 deletions b/‎lib/matplotlib/cbook.py‎
Lines changed: 2 additions & 0 deletions
@@ -1,7 +1,6 @@
-import sys
-
 import numpy as np
 
+from .. import cbook
 from . import _backend_tk
 from .backend_cairo import cairo, FigureCanvasCairo
 from ._backend_tk import _BackendTk, FigureCanvasTk
@@ -14,10 +13,9 @@ def draw(self):
         self._renderer.set_context(cairo.Context(surface))
         self._renderer.dpi = self.figure.dpi
         self.figure.draw(self._renderer)
-        buf = np.reshape(surface.get_data(), (height, width, 4))
-        _backend_tk.blit(
-            self._tkphoto, buf,
-            (2, 1, 0, 3) if sys.byteorder == "little" else (1, 2, 3, 0))
+        premult_argb = np.reshape(surface.get_data(), (height, width, 4))
+        unmult_rgba = cbook._premultiplied_argb32_to_unmultiplied_rgba8888(premult_argb)
+        _backend_tk.blit(self._tkphoto, unmult_rgba, (0, 1, 2, 3))
 
 
 @_BackendTk.export
 
@@ -2210,6 +2210,8 @@ def _premultiplied_argb32_to_unmultiplied_rgba8888(buf):
         [2, 1, 0, 3] if sys.byteorder == "little" else [1, 2, 3, 0], axis=2)
     rgb = rgba[..., :-1]
     alpha = rgba[..., -1]
+    if alpha.min() == 0xff:
+        return rgba
     # Un-premultiply alpha.  The formula is the same as in cairo-png.c.
     mask = alpha != 0
     for channel in np.rollaxis(rgb, -1):