Clarify comment

cbreeden · cbreeden · commit 2c0b413dd5a3 · 2015-11-07T07:55:28.000-06:00
diff --git a/lib/matplotlib/backends/backend_agg.py b/lib/matplotlib/backends/backend_agg.py
@@ -585,8 +585,8 @@ def print_jpg(self, filename_or_obj, *args, **kwargs):
 
             if kwargs.pop("dryrun", False):
                 return
-            # The image is "pasted" onto a white background image to safely
-            # handle any transparency
+
+            # Flatten RGBA image to safely handle transparent regions
             buf = mimage.flatten_rgba(buf)
             img = Image.frombuffer('RGBA', (w, h), buf, 'raw', 'RGBA', 0, 1)
 
