Update app.py

app.py

@@ -261,7 +261,7 @@ def tif_view(filepath):
             if imin<2:
                 img = np.tranpose(img, [2, imin])
         else:
-            Raise ValueError("TIF cannot have more than three dimensions")
+            raise ValueError("TIF cannot have more than three dimensions")
 
         Ly, Lx, nchan = img.shape
         imgi = np.zeros((Ly, Lx, 3))