From c03618551492c55e98425254496112a3bee501b1 Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Sat, 24 Jan 2026 22:48:41 +0200
Subject: [PATCH] Ensure lower before checking if ext in EXTENSION

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>
---
 src/PIL/Image.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 9ed251496..743632e1f 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -406,10 +406,11 @@ def _import_plugin_for_extension(ext: str | bytes) -> bool:
     """Import only the plugin needed for a specific file extension."""
     if isinstance(ext, bytes):
         ext = ext.decode()
+    ext = ext.lower()
     if ext in EXTENSION:
         return True
 
-    plugin = _EXTENSION_PLUGIN.get(ext.lower())
+    plugin = _EXTENSION_PLUGIN.get(ext)
     if plugin is None:
         return False