Update app.py

app.py

@@ -103,7 +103,7 @@ def preprocess_mask(mask):
 # output the sampled images
 def main(user_image):
   # accept the image as input
-  with open(user_image, 'rb') as f:
+  with open(user_image.name, 'rb') as f:
     data = f.read()
   decodeImage(data, user_image.name)
   init_image = PIL.Image.open(user_image).convert("RGB")