refactor: Refactor some functions in preprocess image

fastembed/image/transform/functional.py

@@ -140,7 +140,7 @@ def pad2square(
         image = image.crop((left, top, right, bottom))
         return image
 
-    new_image = Image.new(mode="RGB", size=(size, size), color=fill_color)
+    new_image = Image.new(mode="RGB", size=(size, size), color=fill_color or 0)
     left = (size - width) // 2
     top = (size - height) // 2
     new_image.paste(image, (left, top))

fastembed/image/transform/operators.py

@@ -38,9 +38,7 @@ def __init__(self, mean: Union[float, list[float]], std: Union[float, list[float
         self.std = std
 
     def __call__(self, images: list[np.ndarray]) -> list[np.ndarray]:
-        return [
-            normalize(image, mean=np.array(self.mean), std=np.array(self.std)) for image in images
-        ]
+        return [normalize(image, mean=self.mean, std=self.std) for image in images]
 
 
 class Resize(Transform):
@@ -183,11 +181,12 @@ def _get_resize(transforms: list[Transform], config: dict[str, Any]):
                     )
                 )
         elif mode == "JinaCLIPImageProcessor":
-            resample = (
-                Compose._interpolation_resolver(config.get("interpolation"))
-                if isinstance(config.get("interpolation"), str)
-                else config.get("interpolation", Image.Resampling.BICUBIC)
-            )
+            interpolation = config.get("interpolation")
+            if isinstance(interpolation, str):
+                resample = Compose._interpolation_resolver(interpolation)
+            else:
+                resample = interpolation or Image.Resampling.BICUBIC
+
             if "size" in config:
                 resize_mode = config.get("resize_mode", "shortest")
                 if resize_mode == "shortest":