fix bug

app.py

@@ -397,13 +397,13 @@ def prepare_infer_func():
 
     return image_edit.generate_image
 
-def inference(infer_func, prompt, ref_images, seed, size_level):
+def inference(prompt, ref_images, seed, size_level, infer_func=None):
     start_time = time.time()
 
     image = infer_func(
         prompt,
         negative_prompt="",
-        ref_images=ref_images,
+        ref_images=ref_images.convert('RGB'),
         num_samples=1,
         num_steps=28,
         cfg_guidance=6.0,