Update app.py

app.py

@@ -275,8 +275,9 @@ def tif_view(filepath):
 def norm_path(filepath):
     img = imread(filepath)
     img = normalize99(img)
+    img = np.clip(img, 0, 1)
     fpath, fext = os.path.splitext(filepath)
-    filepath = fpath+'.png'
+    filepath = fpath +'.png'
     imsave(filepath, img)
     return filepath