diff --git a/src/diffusers/image_processor.py b/src/diffusers/image_processor.py
index 5d2e2c2b9c8c..4d8d73c863ae 100644
--- a/src/diffusers/image_processor.py
+++ b/src/diffusers/image_processor.py
@@ -531,17 +531,12 @@ def preprocess(
             )
             image = torch.cat(image, axis=0)
 
-        # ensure the input is a list of images:
-        # - if it is a batch of images (4d torch.Tensor or np.ndarray), it is converted to a list of images (a list of 3d torch.Tensor or np.ndarray)
-        # - if it is a single image, it is converted to a list of one image
-        if isinstance(image, (np.ndarray, torch.Tensor)) and image.ndim == 4:
-            image = list(image)
-        if is_valid_image(image):
-            image = [image]
-        if not all(is_valid_image(img) for img in image):
+        if not is_valid_image_imagelist(image):
             raise ValueError(
-                f"Input is in incorrect format: {[type(i) for i in image]}. Currently, we only support {', '.join(supported_formats)}"
+                f"Input is in incorrect format. Currently, we only support {', '.join(supported_formats)}"
             )
+        if not isinstance(image, list):
+            image = [image]
 
         if isinstance(image[0], PIL.Image.Image):
             if crops_coords is not None: