test `output_gallery_component` as output

app.py

@@ -97,8 +97,8 @@ with gr.Blocks() as demo:
                 submit_button_component = gr.Button(
                     value='Submit', variant='primary', scale=0)
         with gr.Column():
-            output_gallery_component = gr.Image(
-                type='pil', image_mode='RGB', label='Generated image')
+            output_gallery_component = gr.Gallery(
+                label='Generated image')
 
     submit_button_component.click(
         fn=process,