Update app.py

app.py

@@ -20,7 +20,9 @@ def filter_img(input_img,filter_type):
                          [0.349, 0.686, 0.168],
                          [0.272, 0.534, 0.131]])
 
-        filtered_img = np.dot(img, sepia_filter.T).astype(np.uint8)
+        filtered_img = np.dot(img, sepia_filter.T)
+        filtered_img = (filtered_img / filtered_img.max() * 255).astype(np.uint8)
+
     elif filter_type == 'Gray-sharp':
         img = cv2.cvtColor(img,cv2.COLOR_RGB2GRAY)
         filtered_img = cv2.addWeighted(img,4, cv2.blur(img,(128,128)),-4,128)