Update app.py

app.py

@@ -176,6 +176,7 @@ def remove_bg(fl, count):
     if count % 2: # odd: is photo without the flash
         fr_mask = cv2.cvtColor(cv2.imread(fl_).astype(np.uint8), cv2.COLOR_BGR2GRAY)
         fr_mask = (fr_diff - fr_mask).astype(np.uint8)
+        cv2.imwrite(fl_, fr_mask)
 
         m = cv2.inRange(fr, np.array([240,240,240]), np.array([255,255,255]))
         fr[m>0] = (239,239,239)