Do not save orientation in EXIF data

src/PIL/AvifImagePlugin.py

@@ -169,15 +169,16 @@ def _save(
 
     icc_profile = info.get("icc_profile", im.info.get("icc_profile"))
     exif = info.get("exif", im.info.get("exif"))
-    exif_orientation = 0
     if exif:
         if isinstance(exif, Image.Exif):
             exif_data = exif
             exif = exif.tobytes()
         else:
             exif_data = Image.Exif()
             exif_data.load(exif)
-        exif_orientation = exif_data.get(ExifTags.Base.Orientation, 0)
+        exif_orientation = exif_data.pop(ExifTags.Base.Orientation, 1)
+    else:
+        exif_orientation = 1
 
     xmp = info.get("xmp", im.info.get("xmp") or im.info.get("XML:com.adobe.xmp"))
 

src/_avif.c

@@ -170,22 +170,7 @@ exif_orientation_to_irot_imir(avifImage *image, int orientation) {
             image->imir.mode = 0;  // ignored
 #endif
             return;
-        default:  // reserved
-            break;
     }
-
-    // The orientation tag is not mandatory (only recommended) according to JEITA
-    // CP-3451C section 4.6.8.A. The default value is 1 if the orientation tag is
-    // missing, meaning:
-    //   The 0th row is at the visual top of the image, and the 0th column is the visual
-    //   left-hand side.
-    image->transformFlags = otherFlags;
-    image->irot.angle = 0;  // ignored
-#if AVIF_VERSION_MAJOR >= 1
-    image->imir.axis = 0;  // ignored
-#else
-    image->imir.mode = 0;  // ignored
-#endif
 }
 
 static int