Fix Gradio invalid path for built-in stimuli

app.py

@@ -608,9 +608,10 @@ def apply_example(example):
     mcx = example.get("mask_center_x", 0.0)
     mcy = example.get("mask_center_y", 0.0)
     mrad = example.get("mask_radius", 0.3)
-    mask_img = draw_mask_overlay(example["image"], mcx, mcy, mrad)
+    example_image_pil = _image_to_pil(example["image"])
+    mask_img = draw_mask_overlay(example_image_pil, mcx, mcy, mrad)
     return [
-        example["image"],
+        example_image_pil,
         rd.get("model", "resnet50_robust"),
         example["method"],
         rd["epsilon"],
@@ -662,7 +663,11 @@ with gr.Blocks(title="Human Hallucination Prediction", css="""
         with gr.Column(scale=1):
             # Inputs (track path so save filenames use stimulus name when from example)
             default_image_path = os.path.join("stimuli", "urbanoffice1.jpg")
-            image_input = gr.Image(label="Input Image (click to set mask center)", type="pil", value=default_image_path)
+            image_input = gr.Image(
+                label="Input Image (click to set mask center)",
+                type="pil",
+                value=_image_to_pil(default_image_path),
+            )
             current_image_path_state = gr.State(value=default_image_path)
             mask_preview = gr.Image(
                 label="Mask center preview (click to set center — circle shows mask)",