Normal: right output is now an ImageSlider (input ↔ normal)

app.py

@@ -171,7 +171,8 @@ def predict(image: Image.Image, size: str, bg_mode: str):
     npy_path = tempfile.NamedTemporaryFile(delete=False, suffix=".npy").name
     np.save(npy_path, raw.astype(np.float32))
 
-    return rgb_pil, rgb_pil, npy_path
+    # Slider value: (left_image, right_image) — left=input RGB, right=normal map.
+    return (image_pil, rgb_pil), rgb_pil, npy_path
 
 
 # -----------------------------------------------------------------------------
@@ -239,7 +240,12 @@ with gr.Blocks(title="Sapiens2 Normal", theme=gr.themes.Soft(), css=CUSTOM_CSS)
 
     with gr.Row(equal_height=True):
         inp = gr.Image(label="Input", type="pil", height=640)
-        out_img = gr.Image(label="Normal", type="pil", height=640)
+        out_img = gr.ImageSlider(
+            label="Input ↔ Normal (drag the divider)",
+            type="pil",
+            height=640,
+            slider_position=50,
+        )
 
     with gr.Row():
         size = gr.Radio(