Fix issue 474 (#475)

rembg/bg.py

@@ -74,9 +74,8 @@ def alpha_matting_cutout(
 
 
 def naive_cutout(img: PILImage, mask: PILImage) -> PILImage:
-    empty = Image.new("RGBA", (img.size), 0)
-    cutout = Image.composite(img, empty, mask)
-    return cutout
+    img.putalpha(mask)
+    return img
 
 
 def get_concat_v_multi(imgs: List[PILImage]) -> PILImage:

tests/test_remove.py

@@ -47,7 +47,7 @@ def test_remove():
 
             expected_path = Path(here / "results" / f"{picture}.{model}.png")
             # Uncomment to update the expected results
-            # f = open(expected_path, "ab")
+            # f = open(expected_path, "wb")
             # f.write(actual)
             # f.close()