Update app.py

app.py

@@ -1,7 +1,32 @@
 import gradio as gr
-def invert(img):
-    return 255 - img
-iface = gr.Interface(fn=invert, inputs=gr.Image(type="numpy"), outputs=gr.Image())
-iface.launch()
+from PIL import Image
+
+def grayscale_pipeline(prompt):  # keep signature the same at first!
+    # ignore prompt; just use a demo image or make a blank
+    img = Image.new('RGB', (256, 256), color='white')
+    gray = img.convert("L")
+    return gray, 42  # image, seed
+
+with gr.Blocks() as demo:
+    with gr.Column():
+        gr.Markdown(" # Grayscale Test Template")
+
+        with gr.Row():
+            prompt = gr.Text(label="Prompt")
+            run_button = gr.Button("Run")
+
+        result = gr.Image(label="Result")
+
+        gr.Examples(examples=["any"], inputs=[prompt])
+
+    gr.on(
+        triggers=[run_button.click, prompt.submit],
+        fn=grayscale_pipeline,
+        inputs=[prompt],
+        outputs=[result, gr.Number(label="Seed")],  # keep outputs shape
+    )
+
+if __name__ == "__main__":
+    demo.launch()