From a0f51493ca8ce7e90169a41d96d037ef413b659f Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Thu, 22 Jan 2026 00:23:58 +1100
Subject: [PATCH 1/3] Refer to lazy importing, as lazy loading of images is
 separate

---
 src/PIL/Image.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index dfd64ef19..88f79a792 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -323,7 +323,7 @@ def getmodebands(mode: str) -> int:
 
 _initialized = 0
 
-# Mapping from file extension to plugin module name for lazy loading
+# Mapping from file extension to plugin module name for lazy importing
 _EXTENSION_PLUGIN: dict[str, str] = {
     # Common formats (preinit)
     ".bmp": "BmpImagePlugin",
@@ -402,8 +402,8 @@ _EXTENSION_PLUGIN: dict[str, str] = {
 }
 
 
-def _load_plugin_for_extension(ext: str | bytes) -> bool:
-    """Load only the plugin needed for a specific file extension."""
+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()
     if ext in EXTENSION:
@@ -2634,8 +2634,8 @@ class Image:
         filename_ext = os.path.splitext(filename)[1].lower()
         ext = filename_ext.decode() if isinstance(filename_ext, bytes) else filename_ext
 
-        # Try loading only the plugin for this extension first
-        if not _load_plugin_for_extension(ext):
+        # Try importing only the plugin for this extension first
+        if not _import_plugin_for_extension(ext):
             preinit()
 
         if not format:
@@ -3625,7 +3625,7 @@ def open(
     # Try to load just the plugin needed for this file extension
     # before falling back to preinit() which loads common plugins
     ext = os.path.splitext(filename)[1] if filename else ""
-    if not (ext and _load_plugin_for_extension(ext)):
+    if not (ext and _import_plugin_for_extension(ext)):
         preinit()
 
     warning_messages: list[str] = []

From a6b36f0b6bd91a899b6a4038b7f875ce5382776b Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Thu, 22 Jan 2026 00:28:26 +1100
Subject: [PATCH 2/3] format overrides file extension when saving

---
 src/PIL/Image.py | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 88f79a792..e7357cc27 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -2631,14 +2631,20 @@ class Image:
             # only set the name for metadata purposes
             filename = os.fspath(fp.name)
 
-        filename_ext = os.path.splitext(filename)[1].lower()
-        ext = filename_ext.decode() if isinstance(filename_ext, bytes) else filename_ext
-
-        # Try importing only the plugin for this extension first
-        if not _import_plugin_for_extension(ext):
+        if format:
             preinit()
+        else:
+            filename_ext = os.path.splitext(filename)[1].lower()
+            ext = (
+                filename_ext.decode()
+                if isinstance(filename_ext, bytes)
+                else filename_ext
+            )
+
+            # Try importing only the plugin for this extension first
+            if not _import_plugin_for_extension(ext):
+                preinit()
 
-        if not format:
             if ext not in EXTENSION:
                 init()
             try:

From 76d3116ef030e9abb960f6544a272d3060ed2353 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Thu, 22 Jan 2026 18:48:38 +1100
Subject: [PATCH 3/3] Added logger messages to match init()

---
 src/PIL/Image.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index e7357cc27..7d007718d 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -414,9 +414,11 @@ def _import_plugin_for_extension(ext: str | bytes) -> bool:
         return False
 
     try:
+        logger.debug("Importing %s", plugin)
         __import__(f"PIL.{plugin}", globals(), locals(), [])
         return True
-    except ImportError:
+    except ImportError as e:
+        logger.debug("Image: failed to import %s: %s", plugin, e)
         return False