Update app.py

app.py

@@ -161,11 +161,11 @@ with gr.Blocks() as demo:
         with gr.Row():
             with gr.Column():
                 image_input = gr.Image(type='filepath')
-                scale_by = gr.Slider(label="Scale by", minimum=2, maximum=4, step=2)
-                upscale_btn = gr.Button("Upscale!")
+                scale_by = gr.Radio(['2', '4'], label="Scale by")
+                upscale_btn = gr.Button("Upscale!", variant='primary')
             with gr.Column():
                 image_output = gr.Image()
 
-        upscale_btn.click(image_upscale, inputs=[image_input, scale_by], outputs=image_output)
+        upscale_btn.click(image_upscale, inputs=[image_input, int(scale_by)], outputs=image_output)
 
 demo.launch(show_api=False)