update

shadows.py

@@ -307,7 +307,10 @@ def reset_all(image, current_mode, current_points, y_lines, r_lines, y_pairs, r_
     else:
         # Fallback: use current image (might have overlays, but better than nothing)
         base_pil = Image.fromarray(image) if not isinstance(image, Image.Image) else image
-    return base_pil, None, [], [], [], [], []
+    
+    # Convert PIL image to numpy array for Gradio (since type="numpy")
+    base_np = np.array(base_pil.convert("RGB"))
+    return base_np, None, [], [], [], [], []
 
 # ------------------------------ Build Blocks ------------------------------
 
@@ -334,14 +337,17 @@ def build_gradio_interface():
         r_pairs = gr.State([])
         original_image = gr.State(None)  # Store original base image without overlays
 
-        # Store original image when uploaded/changed
+        # Store original image when uploaded (not when programmatically changed)
         def store_original(img, orig):
             """Store the original image when a new image is uploaded."""
             if img is not None:
+                # Make a copy to ensure it doesn't get modified
+                if isinstance(img, np.ndarray):
+                    return img.copy()
                 return img  # Store the new image as original
             return orig  # Keep existing original if no new image
 
-        img_in.change(store_original, inputs=[img_in, original_image], outputs=[original_image])
+        img_in.upload(store_original, inputs=[img_in, original_image], outputs=[original_image])
 
         # link buttons to mode change
         start_y.click(on_mode_change, inputs=[gr.State("yellow"), img_in, current_mode, current_points, y_lines, r_lines, y_pairs, r_pairs],