Update app.py

app.py

@@ -856,7 +856,7 @@ def draw_and_pad(polygons_inch, scaling_factor, boundary_polygon, padding=50,
             pts.append([px, py])
             all_x.append(px)
             all_y.append(py)
-        pixel_polys.append(np.array(pts, dtype=np.int32))
+        pixel_polys.append(np.array(pts, dtype=np.int16))
     
     # 2) Compute the basic canvas size from the polygon bounds.
     min_x, max_x = min(all_x), max(all_x)