Do not down-convert if image is LA when showing with PNG format

python-pillow · May 25, 2019 · 3645867 · 3645867
1 parent e24b494
commit 3645867
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/PIL/ImageShow.py b/src/PIL/ImageShow.py
@@ -71,7 +71,9 @@ def show(self, image, **options):
             # FIXME: auto-contrast if max() > 255?
         else:
             base = Image.getmodebase(image.mode)
-        if base != image.mode and image.mode != "1" and image.mode != "RGBA":
+        if not (base == image.mode or
+                image.mode in ("1", "RGBA") or
+                (self.format == "PNG" and image.mode == "LA")):
             image = image.convert(base)
 
         return self.show_image(image, **options)