Update app.py

app.py

@@ -126,23 +126,24 @@ with gr.Blocks() as demo:
     with gr.Row():
         with gr.Column(scale=1):
             alt_key = gr.Textbox(label="Alternate Mistral API Key (optional)", type="password")
-            url_input = gr.Textbox(label="Image URL", placeholder="https://...", value="")
+            url_input = gr.Textbox(label="Image URL", placeholder="https://...")
             custom = gr.Textbox(label="Custom prompt (optional)", lines=4, placeholder="Leave blank to use auto prompt")
             auto_toggle = gr.Checkbox(label="Use detailed auto prompt", value=True)
-        with gr.Column(scale=1):
             preview = gr.Image(label="Preview", type="pil")
+            submit = gr.Button("Submit")
+        with gr.Column(scale=1):
             out = gr.Textbox(label="Generated Detailed Description", lines=20)
 
-    def load_preview_and_return_url(url):
+    def load_preview(url):
         if not url:
-            return None, ""
+            return None
         try:
             r = requests.get(url, timeout=30)
             r.raise_for_status()
             img = Image.open(BytesIO(r.content)).convert("RGB")
-            return img, url
+            return img
         except Exception:
-            return None, url
+            return None
 
     def start_gen(url, use_auto, custom_p, alt_k):
         if not url:
@@ -150,8 +151,7 @@ with gr.Blocks() as demo:
         for chunk in generate_stream(url, use_auto, custom_p, alt_k):
             yield chunk
 
-    url_input.change(fn=load_preview_and_return_url, inputs=[url_input], outputs=[preview, url_input])
-    # Generate when Submit (press Enter in URL or add separate button if desired)
-    url_input.submit(fn=start_gen, inputs=[url_input, auto_toggle, custom, alt_key], outputs=[out])
+    url_input.change(fn=load_preview, inputs=[url_input], outputs=[preview])
+    submit.click(fn=start_gen, inputs=[url_input, auto_toggle, custom, alt_key], outputs=[out])
 
 demo.launch()