diff --git a/src/llamafactory/data/mm_plugin.py b/src/llamafactory/data/mm_plugin.py
index f6748883..6a174838 100644
--- a/src/llamafactory/data/mm_plugin.py
+++ b/src/llamafactory/data/mm_plugin.py
@@ -30,7 +30,7 @@ if TYPE_CHECKING:
         path: Optional[str]
         bytes: Optional[bytes]
 
-    ImageInput = Union[str, EncodedImage, ImageObject]
+    ImageInput = Union[str, bytes, EncodedImage, ImageObject]
     VideoInput = str
 
 
@@ -104,6 +104,8 @@ class BasePlugin:
         for image in images:
             if isinstance(image, str):
                 image = Image.open(image)
+            elif isinstance(image, bytes):
+                image = Image.open(BytesIO(image))
             elif isinstance(image, dict):
                 if image["bytes"] is not None:
                     image = Image.open(BytesIO(image["bytes"]))